Patent Publication Number: US-2021189565-A1

Title: Device for coating a substrate with a carbon-containing coating

Description:
RELATED APPLICATIONS 
     This application is a National Stage under 35 USC 371 of and claims priority to International Application No. PCT/EP2019/061065, filed 30 Apr. 2019, which claims the priority benefit of DE Application No. 10 2018 110 350.6, filed 30 Apr. 2018 and DE Application No. 10 2018 110 348.4, filed 30 Apr. 2018. 
    
    
     FIELD OF THE INVENTION 
     The invention pertains to a device for depositing graphene, carbon nanotubes or other coatings, particularly carbon-containing coatings, on a strip-shaped substrate that enters a reactor housing through an inlet opening and exits the reactor housing through an outlet opening, wherein said substrate is transported in a transport direction from the inlet opening to the outlet opening through a processing zone that is arranged in the reactor housing and tempered, in particular, by at least one heating device, and wherein a gas inlet of a gas supply conduit leads into said processing zone. 
     BACKGROUND 
     A device for depositing carbon-containing coatings such as graphene or carbon nanotubes (CNT) is described in U.S. Pat. No. 9,227,171 B2. The device described in this publication comprises a reactor that extends in a horizontal direction and has multiple zones, which lie directly adjacent to one another in the horizontal direction and through which an endless substrate is transported. 
     U.S. 2016/0031712 A1 describes a device for producing graphene with multiple processing zones that are arranged behind one another in a transport direction of a substrate. Heating devices are provided in the processing zones in order to heat the substrate to a process temperature. 
     Devices for the treatment of substrates with heat protection shields are known from U.S. 2017/0314134 A1. 
     The relevant prior art furthermore includes US 2018/0209044 A1, JP 2012-166991 A, DE 103 22 935 A1, DE 10 2014 106 451 A1 and DE 10 2015 013 799 A1. 
     SUMMARY OF THE INVENTION 
     The invention is based on the objective of advantageously enhancing a device of the initially described type, particularly in terms of its use, and of disclosing means that make it possible to improve the coating result. 
     An inventive device for depositing graphene or carbon nanotubes or other coatings, particularly carbon-containing coatings, comprises a reactor housing that has two opposite openings. One opening, particularly a gap-shaped opening, forms an inlet opening for a substrate. A second opening forms an outlet opening for the substrate. The substrate preferably is a strip-shaped metal sheet that is unwound from a first roll and continuously guided through a processing zone of the reactor in order to once again exit through the outlet opening. A second roll, on which the substrate is wound up, is located behind the outlet opening. A gas inlet, which may form the end of the tubular gas conduit, may lead into the processing zone in order to introduce a process gas such as CH 4  or another carbon-containing gas into the processing zone. A gas outlet may be located on the opposite side in order to pump the gaseous components out of the processing zone. The introduction of the process gas preferably takes place with a carrier gas that does not react with the process gas. Measures have to be taken in order to prevent an admission of oxygen into the reactor from outside the reactor. To this end, the inlet opening and/or the outlet opening can be flushed with an inert gas such that a diffusion barrier is formed. It is proposed that the gap width of an inlet gap or an outlet gap in the region of the reactor wall is adjustable. A tempering device is located within the reactor and makes it possible to temper the substrate or an atmosphere surrounding the substrate. The tempering device particularly is a heating device that makes it possible to heat the process gas in order to form carbon, particularly due to pyrolytic decomposition, wherein the thusly formed carbon is deposited on the substrate in the form of graphene or carbon nanotubes. The regions of the reactor wall surrounding the inlet opening and the outlet opening can be cooled with suitable means. The invention proposes means for inhibiting the heat transfer from the heated processing zone toward the inlet opening or toward the outlet opening. 
     The means proposed by the invention particularly are provided in an inlet region or an outlet region of the reactor cavity, wherein the inlet region is arranged between the processing zone and the inlet opening and the outlet region is arranged between the processing zone and the outlet opening. The heat transfer-inhibiting means particularly are arranged directly adjacent to a closing plate that respectively contains the inlet opening or the outlet opening and closes the preferably cylindrical reactor on its end faces. In one variation, it is proposed that the heat transfer-inhibiting means form one or more thermal radiation shields. It is furthermore proposed that the heat transfer-inhibiting means are formed by flat bodies. The flat bodies may be sheet metal parts. They may extend transversely or obliquely to the transport direction of the substrate. It is furthermore proposed that the heat transfer-inhibiting means occupy at least 75 percent, preferably at least 80 percent or 90 percent, of a cross-sectional area of the inlet region or the outlet region. The inlet region and the outlet region preferably have a clear cross-sectional area in the shape of a circular disk. The majority of this clear cross-sectional area is occupied by the heat transfer-inhibiting means, wherein it is preferred that a gap zone extending diametrically through the clear cross section and a ring zone surrounding the heat transfer-inhibiting means remain clear. In an enhancement of the invention, it is proposed that slots are arranged in the heat transfer-inhibiting means, which particularly are made of sheet metal. These slots may be narrow slots that are open toward an edge of the heat transfer-inhibiting means. The slots may have a slot width that approximately corresponds to the material thickness of the heat transfer-inhibiting means made of sheet metal. The heat transfer-inhibiting means particularly may have an outline contour that extends on a circular arc-shaped line. At least the inlet region and/or the outlet region likewise have a circular outline contour. The inlet region and the outlet region preferably are formed by an end section of an inner pipe (liner pipe), which extends through the entire reactor cavity and forms the processing zone in its central region. The latter may be surrounded by a heating device in the form of a heating coil. The means for inhibiting the heat transfer arranged in the inlet region or the outlet region may also be surrounded by a heating coil. However, these means may alternatively also be surrounded by a cooling coil. In an enhancement of the invention, it is proposed that the heat transfer-inhibiting means form through-bores for rods or pipes. They may be displaceably guided on rods or pipes. At least one of the pipes may be a pipe of a gas inlet and/or a pipe of a gas outlet. A heat transfer-inhibiting means may be composed of two parts, wherein a gap, through which the substrate is transported, remains between the two preferably semicircular parts. In an enhancement of the invention, it is proposed that multiple heat transfer-inhibiting means, namely at least two but preferably three or four heat transfer-inhibiting means, are arranged behind one another in the transport direction. Such means for inhibiting the heat transfer, which particularly are formed by sheet metal reflectors, may be held at a distance from one another with the aid of spacer means such as spacer sleeves. The spacer sleeves may be arranged on the pipes. However, the spacer sleeves may also be arranged on rods, on which the heat transfer-inhibiting means are displaceably arranged in the reactor. Furthermore, the heat transfer-inhibiting means may have surface areas that differ in size and particularly occupy correspondingly varying cross-sectional areas of the inlet region or the outlet region, wherein at least one heat transfer-inhibiting means with a smaller cross section is arranged at the location lying most remote from the inlet opening or the outlet opening. A heat transfer-inhibiting means may have a cruciform shape. The heat transfer-inhibiting element of cruciform shape preferably has four sections that protrude from a center of the heat transfer-inhibiting means in a radial direction. The center is formed by a center line extending transversely to the transport direction. Two flat bodies may protrude from this center line in a V-shaped manner on one broad side. Two flat bodies may likewise protrude from a center line in a V-shaped manner on the opposite broad side. Two flat bodies protruding obliquely in the transport direction and two flat bodies protruding opposite to the transport direction particularly are formed in this case. The means inhibiting the heat transfer may be a part consisting of two flat bodies that are connected to one another. It would be possible that two flat bodies, which are respectively bent about a ridge line, are connected to one another on the ridge lines. In this case, the ridge lines delimit a gap for the passage of the substrate. It is furthermore proposed that the two flat bodies are connected to one another by means of connecting webs, wherein the connecting webs delimit the gap for the passage of the substrate. Guide elements are provided in an enhancement of the invention that has independent significance, wherein said guide elements are located within the reactor housing and preferably arranged directly adjacent to be inlet opening or the outlet opening. They may be rods that are aligned parallel to the transport direction. A guidance gap, through which the substrate passes, may be formed between the rods. Multiple rods, preferably three rods, may be arranged on each side of the substrate. The rods may consist of a ceramic material. In a preferred embodiment of the invention, the guide elements are held by the heat transfer-inhibiting means. To this end, the heat transfer-inhibiting means may have bores or the like for holding the guide elements. It would be possible that a last means for inhibiting the heat transfer, which particularly lies remote from the inlet opening or the outlet opening, forms a stopping surface, in front of which an end face of the guide element lies. A second end face of the guide element, which points away from the aforementioned end face, may be supported on another means for inhibiting the heat transfer, preferably the first means for inhibiting the heat transfer, or on a closing plate. In an enhancement of the invention, it is proposed that the zone of the inlet region or the outlet region, which lies directly adjacent to the closing plate, is flushed with an inert gas. This measure is intended to prevent the escape of a noteworthy amount of process gas from the inlet opening or the outlet opening. In an enhancement, it is proposed that the reactor is operated in a vertical arrangement. In this variation, the inlet opening and the outlet opening are vertically spaced apart from one another such that the substrate is continuously transported through the reactor housing in the vertical direction. It preferably enters the reactor from below and exits the reactor on its upper side. This can be realized by means of deflection rollers. The gas preferably is also introduced from below such that the gas outlet is provided on the upper side of the reactor. The gas flow within the reactor therefore takes place parallel to the transport direction of the substrate, which can be coated on one or both sides. 
     A first aspect of the invention concerns the design of the heat transfer-inhibiting means as reflectors in the form of flat bodies. A second aspect concerns the slots and/or bores, which are arranged in the heat transfer-inhibiting means made of sheet metal and through which the rods or pipes can extend. A third aspect of the invention concerns the arrangement of multiple heat transfer-inhibiting means behind one another in the transport direction and at a distance from one another. A fourth aspect of the invention concerns the design of the heat transfer-inhibiting means in the form of a cruciform flat body. According to another aspect of the invention, it is proposed that guide elements for guiding a substrate are arranged within the reactor housing in an outlet region that lies directly adjacent to the outlet opening, and that these guide elements are formed by rods or pipes that extend in the transport direction of the substrate. These rods may be arranged directly adjacent to a gap between two parts of a heat transfer-inhibiting means. 
     Another aspect of the invention concerns a device for guiding a substrate into or out of a substrate treatment device through a gap extending between a first gap delimiting body and a second gap delimiting body. A device for guiding a substrate into or out of a substrate treatment device through a gap is proposed in order to additionally impede the admission of oxygen into the processing chamber. The gap width of the gap is defined by a spacing between two gap delimiting bodies. Among other things, it is essential that both gap delimiting bodies abut on one another on the oblique surfaces and can be displaced in the direction of the slope of the oblique surfaces in order to adjust the gap width, wherein the displacement takes place in the direction of the surface area of the substrate and particularly in a direction extending transversely to the transport direction of the substrate. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       Exemplary embodiments of the invention are described below with reference to the attached drawings. In these drawings: 
         FIG. 1  shows a sectioned representation of a reactor, particularly a CVD reactor with a housing  1 , which is arranged in a vertical direction, wherein a strip-shaped substrate  2  being unwound from a first roll  3  is introduced into said reactor through a bottom inlet opening  12  and withdrawn from a top opening  12 ′ in order to be wound up on a second roll  3 ′, 
         FIG. 2  shows an enlarged representation of the detail II in  FIG. 1 , 
         FIG. 3  shows a bottom view of the device illustrated in  FIG. 1 , 
         FIG. 4  shows a first perspective representation of heat transfer-inhibiting means  14 ,  15 ,  16 ,  17  that are fastened on a closing plate  13 , 
         FIG. 5  shows an exploded view of the heat transfer-inhibiting means  14 ,  15 ,  16 ,  17 , 
         FIG. 6  shows a section along the line VI-VI in  FIG. 2 , 
         FIG. 7  shows a representation similar to  FIG. 1 , however, with heat transfer-inhibiting means according to a second exemplary embodiment, 
         FIG. 8  shows a perspective representation of the second exemplary embodiment, 
         FIG. 9  shows a perspective representation of an individual heat transfer-inhibiting means according to the second exemplary embodiment, 
         FIG. 10  shows a view in the direction of the arrow X in  FIG. 9 , 
         FIG. 11  shows a view in the direction of the arrow XI in  FIG. 10 , 
         FIG. 12  shows a view in the direction of the arrow XII in  FIG. 10 , 
         FIG. 13  shows a section along the line XIII-XIII, in  FIG. 10 , 
         FIG. 14  shows a section along the line XIV-XIV in  FIG. 11 , 
         FIG. 15  shows an exploded view of two gap delimiting bodies  110 ,  111 , 
         FIG. 16  shows a front view of the two gap delimiting bodies  110 ,  111  being mounted on one another viewed in the direction of the gap  112  in a first spacing position, 
         FIG. 17  shows two pairs of gap delimiting bodies  110 ,  111 ,  110 ′,  111 ′, which may be jointly arranged on the housing of the substrate treatment device  1  on the inlet side and on the outlet side, 
         FIG. 18  shows a top view of the paired arrangement of the gap delimiting bodies  110 ,  110 ′,  111 ,  111 ′ illustrated in  FIG. 17 , 
         FIG. 19  shows a section along the line XIX-XIX in  FIG. 18 , 
         FIG. 20  shows a section along the line XX-XX in  FIG. 18  with a minimum gap width w, 
         FIG. 21  shows the same section, however, with a maximum gap width w, and 
         FIG. 22  shows a second exemplary embodiment of gap delimiting bodies  110 ,  111 . 
     
    
    
     DETAILED DESCRIPTION 
       FIG. 1  shows a reactor, particularly a CVD reactor, with an elongate cylindrical shape, wherein the axis of the cylindrical housing  1  extends in the vertical direction. The two end faces of the reactor housing  1 , which respectively point downward and upward, are closed with a closing plate  13 . Gas supply conduits  6 ′ and gas discharge conduits  7 ′ lead into the closing plates. The gas supply conduit  6 ′ continues into a pipe, the open end of which forms a gas inlet  6 . The gas discharge conduit  7 ′ continues into a pipe, the open end of which forms a gas outlet  7 . The gas supply conduit  6 ′ is connected to a gas supply system that particularly supplies CH 4 . The gas discharge conduit  7 ′ is connected to a vacuum pump, by means of which the internal pressure within the reactor housing can be approximately adjusted to atmospheric pressure. 
     An inner pipe  9  in the form of a liner pipe extends between the two closing plates  13 . The cylindrical space enclosed by the inner pipe  9  forms an inlet region  5 ′ adjacent to the lower closing plate  13  and an outlet region  5 ″ adjacent to the upper closing plate  13 . The inlet region  5 ′ and the outlet region  5 ″ are respectively surrounded by a helical tempering body  8 ′, by means of which the region  5 ,  5 ′ can be heated or cooled. 
     A processing zone  5  extends between the inlet region  5 ′ and the outlet region  5 ″ and is surrounded by a heating coil  8  in order to heat the processing zone  5  to a process temperature. 
     The lower closing plate  13  and the upper closing plate  13  respectively have a gap  12 , through which a strip-shaped endless substrate  2  can be transported into and once again transported out of the reactor housing cavity. A diffusion barrier  10  is located outside the closing plate  13 . This diffusion barrier consists of multiple gap delimiting bodies that serve for adjusting the gap width of the gap, through which the substrate  2  can be transported into the reactor housing or out of the reactor housing. The diffusion barrier  10  furthermore comprises gas infeed openings, by means of which a flushing gas can be introduced into the gap between the two gap delimiting bodies. 
     Multiple heat transfer-inhibiting means  14 ,  15 ,  16 ,  17  and multiple guide elements  11  for guiding the substrate  2  are located on the inner side of each of the two closing plates  13  facing the processing zone  5 . 
     In the exemplary embodiment, the means  14 ,  15 ,  16 , for inhibiting the heat transfer from the processing zone  5  toward the closing plates  3  are formed by reflector plates  14 ,  15 ,  16 ,  17 . 
     In the first exemplary embodiment illustrated in  FIGS. 2 to 6 , the reflector plates  14 ,  15 ,  16 ,  17  are formed by thin sheet metal plates that essentially have a circular outline and are respectively arranged in the inlet region  5 ′ and the outlet region  5 ″ in such a way that their surfaces are aligned transversely to the transport direction of the substrate. The reflector plates  14 ,  15 ,  16 ,  17  are spaced apart from one another by means of spacer sleeves  18 . Each reflector plate  14 ,  15 ,  16 ,  17  is composed of two parts. These parts are respectively realized in the form of semicircular parts, wherein a gap  19 , through which the substrate  2  can be transported, remains between said semicircular parts. A first reflector plate  17  is spaced apart from the closing plate  13  by a first distance with the aid of multiple spacer sleeves  18 . A second reflector plate  16  is spaced apart from the first reflector plate  17  with the aid of spacer sleeves  18 . A third reflector plate  15  is spaced apart from the second reflector plate  16  with the aid of spacer sleeves  18 . A fourth reflector plate  14  is spaced apart from the third reflector plate  15  with spacer sleeves  18 . The first and the second reflector plate  16 ,  17  have a diameter that essentially corresponds to the inside diameter of the inner pipe  9  whereas the third reflector plate  15  has a smaller diameter. Furthermore, the spacing between the third reflector plate  15  and the second reflector plate  16  is also smaller than the spacing between the second reflector plate  16  and the first reflector plate  17 , which approximately corresponds to the spacing between the first reflector plate  17  and the closing plate  13 . The spacing between the fourth reflector plate  14  and the third reflector plate  15  is once again smaller than the spacing between the third reflector plate  15  and the second reflector plate  16 . 
     All reflector plates  14 ,  15 ,  16 ,  17  have radial slots  20  in the exemplary embodiment. The slot width of these radial slots  20  approximately corresponds to the material thickness of the reflector plates  14 ,  15 ,  16 ,  17 . 
     First bores  22  are furthermore provided in each of the reflector plates  14 ,  15 ,  16 ,  17 , wherein rods or pipes, on which the reflector plates  14 ,  15 ,  16 ,  17  are fastened, can extend through said first bores. The pipes may be the pipes for feeding the gas inlet  6  or the pipes connected to the gas outlet  7 . However, this may also concern guide rods that merely have the function of guiding the reflector plates  14 ,  15 ,  16 ,  17 . 
     Second bores  21  are provided directly adjacent to a linear outer edge of each part of a reflector plate  14 ,  15 ,  16 ,  17 . These second bores  21  serve for receiving the aforementioned guide elements  11  in the form of rods. The rods are made of a ceramic material. The respective end faces of the rods may be supported on the closing plate  13  on the one hand and on the fourth reflector plate  14  on the other hand. It is particularly proposed to provide three pairs of opposite guide elements  11 . Two guide elements  11  are respectively arranged on the two outer edges of the substrate  2 . A third pair of guide elements  11  is arranged in the substrate center, i.e. centrally between the outer edges. 
     The reflector plates  14 ,  15 ,  16 ,  17  may also be shield plates of identical shape. The reflector plates  14 ,  15 ,  16 ,  17  or shield plates inhibit the heat transfer from the processing zone  5  toward the inlet opening  12  or toward the outlet opening  12 ′. 
       FIGS. 7 to 14  show a second exemplary embodiment of a shield plate  14 ,  15  or a reflector plate  14 ,  15 . The means for inhibiting the heat transfer from the processing zone  5  toward the inlet region  5 ′ or toward the outlet region  5 ″ particularly are reflection elements  14 ,  15  or shield elements  14 ,  15 . A heat transfer-inhibiting means according to the second exemplary embodiment consists of two metal sheets  14 ,  15  that are bent along a ridge line  14 ′,  15 ′ by an angle of approximately  90  degrees. The two metal sheets  14 ,  15  are connected to one another on the ridge lines  14 ′,  15 ′. To this end, connecting webs  24  are provided in order to hold the ridge lines  14 ′,  15 ′ at a distance from one another such that a gap  19 , through which the substrate  2  can be transported, is formed between the ridge lines  14 ′,  15 ′. 
     The interconnected reflector or shield plates  14 ,  15  form a heat transfer-inhibiting means that essentially occupies the cross-sectional area of the inner pipe  9 . 
     The two limbs of each reflector or shield plate  14 ,  15  are connected to one another with spacer sleeves  18 . The ends of the sleeves may be rigidly connected to one of the limbs. Rods or pipes extend through these sleeves and respectively serve for holding the heat transfer-inhibiting means in a displaceable manner or for fixing the heat transfer-inhibiting means in position. 
       FIG. 7  furthermore shows a rod  25  that extends between the opposite closing plates  13  and lies in a recess  23  of the heat transfer-inhibiting means. 
     The inlet region  5 ′ and/or the outlet region  5 ″ may be respectively provided with just one heat transfer-inhibiting means. 
     The rolls  3 ,  3 ′ may be operated by an electric motor. A first deflection roller  4  is provided for deflecting the substrate  2  entering the reactor  1  and a second deflection roller  4 ′ is provided for deflecting the substrate  2  exiting the reactor housing  1 . 
     A gas-flushed zone  26  is located directly adjacent to the closing plate  13  in the inlet region  5 ′ and in the outlet region  5 ″. An inert gas is introduced into this zone in the cavity of the reactor housing by means of a not-shown gas inlet. 
       FIGS. 15 to 22  concern another aspect of the invention. 
     The cavity of the substrate treatment device  1  is respectively closed with a closing plate  13 ,  13 ′ on the inlet side and on the outlet side. The closing plate  13 ,  13 ′ has a gap opening, through which the substrate  2  is transported. The closing plates  13 ,  13 ′ carry on their respective outer sides an arrangement that respectively consists of two gap delimiting bodies  110 ,  110 ′,  111 ,  111 ′. The gap delimiting bodies  110 ,  110 ′,  111 ,  111 ′ have gap delimiting surfaces or gap walls  115 ,  115 ′ that face one another and are spaced apart from one another by approximately 0 to 5 mm. The gap width w preferably amounts to no more than 2 mm. 
     Two arrangements, which respectively consists of two gap delimiting bodies  110 ,  111 , are respectively arranged behind one another in the transport direction of the gap on the inlet side and on the outlet side such that the substrate has to pass through two of these arrangements when it enters the substrate treatment device  1  and through two of these arrangements when it exits the substrate treatment device  1 . We refer to  FIGS. 15 to 21  with respect to the design of the arrangements of gap delimiting bodies  110 ,  111 . 
     Each arrangement of gap delimiting bodies  110 ,  111  comprises two gap delimiting bodies  110 ,  111  that are designed identical to one another. In the assembled state, they have gap delimiting walls  115 ,  115 ′ that face one another, wherein the gap  112  extends between said gap delimiting walls. The gap delimiting walls  115 ,  115 ′ are formed by a base body  114 ,  114 ′ that is made of steel, particularly special steel. In the exemplary embodiment, they are realized in the form of elongate base bodies  114 ,  114 ′, the extending direction of which is oriented transversely to the transport direction of the substrate  2 . 
     The rear sides of the base bodies  114 ,  114 ′ lying opposite of the gap delimiting walls  115 ,  115 ′ have a trough-shaped recess that respectively forms a gas distribution chamber  117 ,  117 ′. The base of the gas distribution chambers  117 ,  117 ′ extends parallel to the gap delimiting wall  115 ,  115 ′ and comprises a plurality of regularly arranged bores, wherein said bores form gas outlet openings  116 ,  116 ′ leading into the gap delimiting wall  115  such that this gap delimiting wall forms a gas outlet surface. The opening of the depression forming the gas distribution chamber  117  is surrounded by an annular groove  119 ,  119 ′, wherein a sealing cord  118 ,  118 ′ such as an O-ring lies in said annular groove in order to cover the gas distribution chambers  117 ,  117 ′ with a cover  120 ,  120 ′ that is fastened on the base body  114 ,  114 ′ by means of fastening screws. A flushing gas can be fed into the gas distribution chamber  117  by means of a gas supply conduit  124 ,  124 ′ connected to the cover  120 ,  120 ′. 
     The gap delimiting wall  115 ,  115 ′ forms a gas outlet surface. The gas outlet surface has an elongate shape, wherein the extending direction of the gas outlet surface  115 ,  115 ′ is oriented transversely to the transport direction of the substrate  2 . Identically oriented oblique surfaces  121 ,  121 ′,  122 ,  122 ′ lie adjacent to two opposite ends of the gas outlet surface  115 ,  115 ′, which in the exemplary embodiment are formed by the narrow side ends of the gas outlet surface  15 ,  15 ′. The first oblique surface  121 ,  121 ′ is sloped upward by approximately  10  degrees whereas the second oblique surface  122 ,  122 ′ is sloped downward by approximately 10 degrees. The two oblique surfaces  121 ,  121 ′,  122 ,  122 ′ extend in parallel planes to one another. 
     The two gap delimiting bodies  110 ,  111  are placed on top of one another in such a way that a first oblique surface  121 ′ of a second gap delimiting body  111  lies on a second oblique surface  122  of the first gap delimiting body  110  and a second gap delimiting surface  122 ′ of the second gap delimiting body  111  lies on a first oblique surface  121  of the first gap delimiting body  110 . A displacement in a direction, which is identified by the reference symbol S in  FIG. 21 , makes it possible for the oblique surfaces  121 ,  121 ′,  122 ,  122 ′ to slide along one another and to displace these oblique surfaces relative to one another. During such a displacement, the two gap delimiting bodies  110 ,  111  are not only displaced in a direction that lies in the gap plane, but also in a direction extending transversely thereto, such that the gap width w can be varied between a minimum gap width w illustrated in  FIG. 20  and a maximum gap width w′ illustrated in  FIG. 21 . The direction of displacement, in which one gap delimiting body  110  is displaced relative to the other gap delimiting body  111 , is respectively oriented obliquely to the surface normal of the gap delimiting wall  115 ,  115 ′ or to the gap plane. 
     Set screws  123 ,  123 ′ are provided for realizing a sensitive adjustment of the gap with w, w′, wherein said set screws are respectively screwed into threaded bores  128 ,  128 ′ in a broad side of the gap delimiting body  110 ,  111 . The heads of the set screws  123 ,  123 ′ act upon a sidewall of a respective other gap delimiting body  111  such that the gap width w, w′ can be adjusted by means of a rotational adjustment of the set screw  123 ,  123 ′. It is preferred to respectively arrange two set screws  123 ,  123 ′ on both narrow sides of the base body  114 ,  114 ′, wherein these set screws not only make it possible to adjust the gap width w, w′, but also to fix the gap width w, w′, because opposing screws act in opposite directions. 
     A threaded bore  127 ,  127 ′ is located within the first oblique surface  121 ,  121 ′. The axis of the threaded bore  127 ,  127 ′ extends in the direction of the surface normal of the gap wall  115 ,  115 ′. An oblong hole  126  for the passage of a fastening screw  125 ,  125 ′ is located in the second oblique surface  122 ,  122 ′, wherein said fastening screw can be screwed into the internal thread  127 ,  127 ′ in order to tension the two gap surfaces  121 ,  122 ,  121 ′,  122 ′ relative to one another. 
     The reference symbols  130 ,  130 ′ identify coupling elements, by means of which two pairs of gap delimiting bodies  110 ,  111 ,  110 ′,  111 ′ can be coupled to one another in such a way that the gaps  112  of the respective pairs are aligned with one another. 
     The preceding explanations serve for elucidating all inventions that are included in this application and respectively enhance the prior art independently with at least the following combinations of characteristics, wherein two, multiple or all of these combinations of characteristics may also be combined with one another, namely: 
     A device, which is characterized in that heat transfer-inhibiting means  14 ,  15 ,  16 ,  17  are arranged between the processing zone  5  and the inlet opening  12  and/or the outlet opening  12 ′ and reduce a heat transfer from the processing zone  5  toward the inlet opening  12  or the outlet opening  12 ′. 
     A device, which is characterized in that the heat transfer-inhibiting means  14 ,  15 ,  16 ,  17  are one or more thermal radiation protection shields and/or reflectors and/or are formed by flat bodies extending transversely or obliquely to the transport direction and/or have a cross-sectional area that occupies more than 75 percent, preferably more than 80 percent or more than 90 percent, of the clear cross section of an inlet region  5 ′ or outlet region  5 ″, which lies adjacent to the processing zone  5  and in which the heat transfer-inhibiting means  14 ,  15 ,  16 ,  17  are arranged. 
     A device, which is characterized in that the heat transfer-inhibiting means  14 ,  15 ,  16 ,  17  made of sheet metal have slots  20  and/or through-bores  22  for rods  11  or pipes  6 ,  7  and/or are displaceably supported on rods  11  or pipes  6 ,  7  and/or are penetrated by a pipe of a gas inlet  6  or a pipe of a gas outlet  7  and/or consist of two parts, between which a gap  19  for the passage of the substrate  2  remains. 
     A device, which is characterized in that multiple heat transfer-inhibiting means  14 ,  15 ,  16 ,  17  are arranged behind one another in the transport direction and/or held at a distance from one another with the aid of spacer means and/or have reflection surfaces that differ from one another with respect to their size. 
     A device, which is characterized in that one or more heat transfer-inhibiting means  14 ,  15 ,  16 ,  17  are a single-part or multi-part flat body with a circular design and/or a flat body with a cruciform design and/or formed by two flat bodies  14 ,  15  that are bent about a ridge line  14 ′,  15 ′, wherein said flat bodies  14 ,  15  are connected to one another on the ridge lines  14 ′,  15 ′ in order to form a gap  19  for the passage of the substrate  2 , and/or in that two flat bodies  14 ,  15  are connected to one another with connecting webs  24  in order to form a gap  19  for the passage of the substrate  2 . 
     A device, which is characterized in that guide elements  11  for guiding the substrate  2  are arranged within the reactor housing  1  in an inlet region  5 ′ bordering directly on the inlet opening  12  and/or in an outlet region  5 ″ bordering directly on the outlet opening  12 ′. 
     A device, which is characterized by guide elements  11  for guiding the substrate  2 , which are arranged within the housing  1  in an inlet region  5 ′ and/or an outlet region  5 ″, and/or in that guide elements  11  for guiding the substrate  2  extend into the cavity of the housing  1  directly adjacent to the inlet opening  12  or the outlet opening  12 ′. 
     A device, which is characterized in that guide elements  11  for guiding the substrate  2  are formed by rods, which extend in the transport direction and are arranged directly the gap  19  between two parts of a heat transfer-inhibiting means  14 ,  15 ,  16 ,  17  and/or are supported by heat transfer-inhibiting means  14 ,  15 ,  16 ,  17  and/or extend through bores  21  of the heat transfer-inhibiting means  14 ,  15 ,  16 ,  17 . 
     A device, which is characterized in that the gap-shaped inlet opening  12  and/or the gap-shaped outlet opening  12 ′, through which the substrate  2  being unwound from a first roll  3  and wound up on a second roll  3 ′ and being continuously transported through the processing zone  5  passes, is flushed with an inert gas and/or in that the reactor housing  1  has the shape of a circular cylinder and the inlet opening  12  and/or the outlet opening  12 ′ is arranged on one of the end faces of the reactor housing  1 . 
     A device, which is characterized in that the transport direction of the substrate  2  through the reactor housing  1  is a vertical direction and/or in that the substrate  2  enters the reactor housing  1  through an inlet opening  12  arranged on the underside of the reactor housing and/or exits the reactor housing  1  through an outlet opening  12 ′ arranged on the upper side of the reactor housing  1  and/or in that a gas inlet  6  and a gas outlet  7  are arranged in an inlet region  5 ′ and/or an outlet region  5 ″ of the cavity of the reactor housing  1  in such a way that the gas flow through the processing chamber  5  is directed from the bottom toward the top. 
     A device, which is characterized in that the spacing between the two gap delimiting bodies  110 ,  110 ′;  111 ,  111 ′, which defines a gap width w, is adjustable. 
     A device, which is characterized in that the first and the second gap delimiting body  110 ,  110 ′;  111 ,  111 ′ are designed identically to one another. 
     A device, which is characterized in that surfaces  115 ,  115 ′ of a respective base body  114 ,  114 ′ of the gap delimiting body  110 ,  110 ′;  111 ,  11 ′, which form delimiting walls of the gap  112 , have gas outlet openings  116 ,  116 ′ leading into the gap  112 , wherein it is particularly proposed that the gas outlet openings  116 ,  116 ′ are formed by bores that connect a gas distribution volume  117 ,  117 ′ arranged in the gap delimiting body  110 ,  110 ′;  111 ,  111 ′ to the gap  112 , wherein it is particularly proposed that a plurality of gas outlet openings  116 ,  16 ′ are distributed over the surface  115 ,  115 ′ in a regular arrangement similar to a showerhead, and wherein it is particularly proposed that the gas outlet openings  116 ,  116 ′ are arranged in multiple rows, particularly in at least four rows, which lie adjacent to one another in the transport direction. 
     A device, which is characterized in that two pairs of gap delimiting bodies  110 ,  110 ′;  111 ,  111 ′ respectively lie behind one another in a transport direction of the particularly flat, strip-shaped substrate  2 . 
     A device, which is characterized in that a first gap delimiting body  110 ,  110 ′ has a first oblique surface  121  that abuts on a second oblique surface  122 ′ of a second gap delimiting body  111 ,  111 ′ and/or in that a first gap delimiting body  110 ,  110 ′ has a second oblique surface  122  that abuts on a first oblique surface  121 ′ of the second gap delimiting body  111 ,  111 ′, wherein the gap delimiting bodies  110 ,  110 ′;  111 ,  111 ′ can be displaced in a gap extending direction S, particularly transversely to a transport direction of the substrate  2 , in order to adjust the gap width w, and wherein the gap width w can be varied due to a sliding motion of the first and second oblique surfaces  121 ,  121 ′,  122 ,  122 ′ on one another. 
     A device, which is characterized by a set screw  123  for adjusting the gap width w, wherein internal threads  128 ,  128 ′, into which the threaded shafts of the set screws  123  are screwed, are provided in sidewalls that particularly extend perpendicular to the gap delimiting surfaces  115 ,  115 ′, and wherein the heads of said set screws abut on sidewalls of a respective other gap delimiting body  110 ,  110 ′;  111 ,  111 ′. 
     A device, which is characterized in that base bodies  114 ,  114 ′ of the gap delimiting bodies  110 ,  110 ′;  111 ,  111 ′ have oblong holes  126 ,  126 ′, wherein fastening screws  125 ,  125 ′, which are screwed into the internal thread  127 ,  127 ′ of a respective other gap delimiting body  110 ,  110 ′;  111 ,  111 ′, extend through said oblong holes in order to press the abutting oblique surfaces  121 ,  121 ′,  122 ,  122 ′ against one another, and wherein it is particularly proposed that the oblong hole  126  and/or the internal thread  127 ,  127 ′ is respectively arranged in the region of an oblique surface  121 ,  121 ′,  122 ,  122 ′. 
     A device, which is characterized in that the gap width w is infinitely variable in a range between 0 and 5 mm and/or in that the angle of the oblique surface  121 ,  121 ′,  122 ,  122 ′ to the gap extending direction or the gap extending plane lies in the range between 5 and 40 degrees or 5 and 20 degrees, preferably in a range between 9 and 11 degrees. 
     A utilization of a device according to one of the preceding claims on a substrate treatment device  1 , namely on two respective sides of the substrate treatment device  1  that face away from one another, wherein a substrate  2  being unwound from a first roll  3  enters a processing chamber  5  of the substrate treatment device  1  through a first arrangement of at least two gap delimiting bodies  110 ,  110 ′;  111 ,  111 ′, is coated with graphene, carbon nanotubes or another coating in said processing chamber, exits from a second arrangement of at least two gap delimiting bodies  110 ,  110 ′;  111 ,  111 ′ and is wound up on a second roll  3 ′. 
     All disclosed characteristics are essential to the invention (individually, but also in combination with one another). The disclosure of the associated/attached priority documents (copy of the priority application) is hereby fully incorporated into the disclosure content of this application, namely also for the purpose of integrating characteristics of these documents into claims of the present application. The characteristics of the dependent claims also characterize independent inventive enhancements of the prior art without the characteristics of a claim to which they refer, particularly for submitting divisional applications on the basis of these claims. The invention specified in each claim may additionally comprise one or more of the characteristics that were disclosed in the preceding description and, in particular, are identified by reference symbols and/or included in the list of reference symbols. The invention also concerns design variations, in which individual characteristics cited in the preceding description are not realized, particularly as far as they are obviously dispensable for the respective intended use or can be replaced with other, identically acting technical means. 
     LIST OF REFERENCE SYMBOLS 
       1  Substrate treatment device, reactor housing 
       2  Substrate 
       3  Roll 
       3 ′ Roll 
       4  Deflection roller 
       4 ′ Deflection roller 
       5  Processing zone 
       5 ′ Inlet region 
       5 ″ Outlet region 
       6  Gas inlet 
       6 ′ Gas supply conduit 
       7  Gas outlet 
       7 ′ Gas discharge conduit 
       8  Heating coil 
       8 ′ Heating coil 
       9  Liner pipe 
       10  Diffusion barrier 
       11  Guide element 
       12  Inlet opening, gap 
       12 ′ Outlet opening, gap 
       13  Closing plate 
       13 ′ Closing plate 
       14  Fourth reflector plate, ridge element 
       14 ′ Ridge line 
       15  Third reflector plate, ridge element 
       15 ′ Ridge line 
       16  Second reflector plate 
       17  First reflector plate 
       18  Spacer sleeve 
       19  Gap 
       20  Slot 
       21  Bore 
       22  Bore, through-bore 
       23  Recess 
       24  Connecting web 
       25  Rod 
       26  Gas-flushed zone 
       110  Gap delimiting body 
       110 ′ Gap delimiting body 
       111  Gap delimiting body 
       111 ′ Gap delimiting body 
       112  Gap 
       114  Base body 
       114 ′ Base body 
       115  Gap wall (gas outlet surface) 
       115 ′ Gap wall (gas outlet surface) 
       116  Gas outlet opening 
       116 ′ Gas outlet opening 
       117  Gas distribution chamber 
       117 ′ Gas distribution chamber 
       118  Sealing cord 
       118 ′ Sealing cord 
       119  Annular groove 
       119 ′ Annular groove 
       120  Cover 
       120 ′ Cover 
       121  Oblique surface 
       121 ′ Oblique surface 
       122  Oblique surface 
       122 ′ Oblique surface 
       123  Set screw 
       123 ′ Set screw 
       124  Gas supply conduit 
       124 ′ Gas supply conduit 
       125  Fastening screw 
       125 ′ Fastening screw 
       126  Oblong hole 
       126 ′ Oblong hole 
       127  Threaded bore, internal thread 
       127 ′ Threaded bore, internal thread 
       128  Threaded bore, internal thread 
       128 ′ Threaded bore, internal thread 
       129  Recess 
       130  Coupling element 
       130 ′ Coupling element 
     w Gap width 
     w′ Gap width 
     S Gap extending direction