LOW-CONCENTRATION AIR POLLUTANT SELECTIVE DETECTION DEVICE

The present invention relates to a low-concentration air pollutant selective detection device and, more specifically, to a low-concentration air pollutant selective detection device capable of detecting a low-concentration air pollutant with high sensitivity, and selectively detecting an air pollutant when necessary. The low-concentration air pollutant selective detection device of the present invention comprises: a sensor which is located in a flow path, through which the gas moves, to detect contaminants in the gas; and a concentrator part which, by including an adsorbent that is positioned in the flow path of the gas that moves to the sensor and adsorbs contaminants in the gas, and a desorption means that is positioned adjacent to the adsorbent to individually desorb different contaminants from the adsorbent, delivers the concentrated contaminants to the sensor.

TECHNICAL FIELD

The present invention relates to a low-concentration air pollutant selective detection device and, more specifically, to a low-concentration air pollutant selective detection device capable of detecting a low-concentration air pollutant with high sensitivity, and selectively detecting an air pollutant when necessary.

BACKGROUND ART

Air pollutant means that trace substances that adversely affect organisms or substances are included in the air, and may be divided into gaseous contaminant and dust. The former includes sulfur dioxide and carbon monoxide, and the latter includes trace heavy metals, silicic acid, organic substances, and the like.

When a human body is exposed to high-concentration air pollutant for a long time, various devices have been developed to measure and process the air pollutant as the air pollutant may adversely affect the human body.

However, most conventional popular detection sensors for measuring air pollutant are capable of detecting up to ppm range, and therefore, have difficulty detecting a very small amount of air pollutant below ppm. Accordingly, high-sensitivity air pollutant sensors capable of detecting up to ppb and ppt concentrations have been developed. However, since the air pollutant sensors are expensive, it has been difficult to practically spread the air pollutant sensors and apply the air pollutant sensors to industry.

Korean Patent Publication No. 10-1634653, titled “Adsorbent for Concentration of Gas Aanalytes and Manufacture Method of The Adsorbent, Detecting Method of Gas Aanalyte” discloses an adsorbent capable of adsorbing a trace of toxic gas and a method for detecting the trace of toxic gas, but relates to the desorption of toxic substances from which moisture is excluded through an adsorbent that exhibits water repellency and has the disadvantage in that toxic substances to be measured is very limited, and an analysis time is very long as the toxic substance is measured through several steps such as concentration step, recovery step, removal step, and analysis step.

DISCLOSURE

Technical Problem

An object of the present invention is to provide a detection device capable of selectively detecting various types of air pollutants when necessary.

In addition, an object of the present invention is to provide a detection device capable of high-sensitivity sensing of a sensor by concentrating and then desorbing a trace of air pollutant.

Technical Solution

In one general aspect, a low-concentration air pollutant selective detection device includes: a sensor which is located in a flow path, through which the gas moves, to detect contaminants in the gas; and a concentrator part which, by including an adsorbent that is positioned in the flow path of the gas that moves to the sensor and adsorbs contaminants in the gas, and a desorption means that is positioned adjacent to the adsorbent to individually desorb different contaminants from the adsorbent, delivers the concentrated contaminants to the sensor.

The adsorbent may be arranged in plurality, but at least two of the adsorbents may be made of different materials so that different contaminants are adsorbed, and the desorption means may be positioned adjacent to each adsorbent and desorbs the contaminant adsorbed to each adsorbent.

The adsorbent may be a porous adsorption structure and is installed to partition the flow path, and the desorption means may be installed to surround an outer circumferential surface of the adsorbent.

The desorption means may be a heating structure and is installed to partition the flow path, and the adsorbent may include an adsorption material coated on a surface of the heating structure.

The heating structure may be any one metal of iron (Fe), chromium (Cr), aluminum (Al), nickel (Ni), platinum (Pt), molybdenum (Mo), tungsten (W), and tantalum (Ta) or an alloy thereof.

The heating structure may be any one of silicon carbide (SiC)-based, molybdenum silicide (MoSi2)-based, carbon-based, and zirconia-based heating elements.

The adsorption material may be any one or two or more selected from the group consisting of silica gel, activated alumina, synthetic zeolite, charcoal, bone charcoal, activated carbon, metal organic frameworks (MOF), hypercrosslinked polymeric resin (HPR), and zeolites.

The low-concentration air pollutant selective detection device may further include: a main line which forms a main flow path through which gas introduced from the outside moves to the sensor; the concentrator part which is located in the main flow path; and a subline which is positioned between the concentrator part and the sensor and forms a sub-flow path branched from the main flow path.

The concentrator part may be provided in plurality and may be connected in parallel to each other in the main flow path.

A low-concentration air pollutant selective detection method includes: an adsorption mode including a step of adsorbing different contaminants included in gas to adsorbents of different materials included in a concentrator part, respectively; and a desorption mode including a step of individually detaching different contaminants from the adsorbent and moving the contaminants to a sensor by a desorption means positioned adjacent to the adsorbent, in which the adsorption mode and the desorption mode may be selectively performed.

The adsorption mode may include a step in which a main flow path is opened and gas is introduced into the concentrator part located in the main flow path; a step of adsorbing different contaminants to each adsorbent, and a step in which the gas passing through the adsorbent is discharged through a sub-flow path branched from the main flow path, and the desorption mode may include a step of desorbing the contaminant from the adsorbent by any one or two or more desorption means selected from a desorption means positioned adjacent to each adsorbent, a step of moving the desorbed contaminant to a sensor along the main flow path, and a step of measuring information including a concentration of the contaminant by the sensor.

The desorption mode may proceed when a set period of time elapses in the adsorption mode.

Advantageous Effects

According to a low-concentration air pollutant selective detection device of the present invention, it is possible for a sensor to realize high-sensitivity sensing as a trace of air pollutants are adsorbed and concentrated by a concentrator part equipped with an adsorbent and then desorbed in a large amount.

In addition, by separately desorbing contaminants attached to each adsorbent as needed through a desorption means, it is possible to selectively sense the contaminants.

BEST MODE

Technical terms and scientific terms used herein have the general meaning understood by those skilled in the art to which the present invention pertains unless otherwise defined, and a description for the known function and configuration unnecessarily obscuring the gist of the present invention will be omitted in the following description and the accompanying drawings.

Also, the singular forms used in the specification are intended to include the plural forms as well, unless the context specifically dictates otherwise.

In addition, unless specifically stated, units used in this specification are based on weight, and as an example, a unit of % or ratio means weight % or weight ratio, and unless otherwise defined, weight % means wt % means weight % of any one component in the composition out of the total composition.

In addition, numerical ranges as used herein include all possible combinations of lower and upper limits and all values within that range, increments logically derived from the form and width of the defined ranges, all values defined herein, and upper and lower limits of numerical ranges defined in different forms. Unless otherwise defined in the specification of the present invention, values out of a numerical range that may occur due to experimental errors or rounding of values are also included in the defined numerical range.

“Including” mentioned herein is an open-ended description having an equivalent meaning to expressions such as “comprising,” “containing,” “having,” “characterizing,” and elements, materials, or processes not listed additionally are not excluded.

A low-concentration air pollutant selective detection device of the present invention includes: a sensor which is located in a flow path, through which the gas moves, to detect contaminants in the gas; and a concentrator part which, by including an adsorbent that is positioned in the flow path of the gas that moves to the sensor and adsorbs contaminants in the gas, and a desorption means that is positioned adjacent to the adsorbent to individually desorb different contaminants from the adsorbent, delivers the concentrated contaminants to the sensor.

Conventionally, an air pollutant detection device has difficulty in measuring a trace of contaminants. Therefore, the contaminant is concentrated in the adsorbent and then desorbed, so the sensing of the sensor is possible through the concentrated contaminant, but as several contaminants move to a sensor unit at the same time, a concentration of a specific contaminant to be sensed is relatively low, so it is difficult to obtain reliable results. In addition, since it is not possible to selectively measure contaminants that need to be measured, it is inconvenient to separately sense each contaminant. In addition, there is a disadvantage in that an analysis time is very long as toxic substances are measured through several steps such as a concentration step, a recovery step, a removal step, and an analysis step.

On the other hand, according to the low-concentration air pollutant selective detection device of the present invention, the high-sensitivity sensing of the sensor is possible as a trace of air pollutant is concentrated by the concentrator part and then delivered to a sensor side. In addition, according to the present invention, the target contaminants may be selectively adsorbed, different contaminants attached to each adsorbent may be individually desorbed through a desorption means when necessary, and then delivered to the sensor. Accordingly, the selective sensing of the contaminant is possible.

FIGS.1and2illustrate a low-concentration air pollutant selective detection device according to an embodiment of the present invention.

Referring toFIGS.1and2, the low-concentration air pollutant selective detection device according to the embodiment of the present invention may include a main member250which forms a main flow path250athrough which gas introduced from the outside moves to a sensor650, a concentrator part450which is located in the main flow path250a, and a sub-member350which is located between the concentrator part450and the sensor650and forms a sub-flow path350abranched from the main flow path250a.

In detail, the main member250forms the main flow path250awhich is a passage through which gas containing a contaminant moves. As illustrated in the drawings, the main member250may be provided as a tubular member, but may be a body having an internal space such as an enclosure. That is, the main member250forms the main flow path250a, which is a passage through which gas moves, and is not limited as long as it has a structure in which the concentrator part450may be installed. The main member250is opened and closed by a first valve251to control whether gas is supplied from the outside. In addition, the main member250may be connected to a mass flow controller (MFC)252. The gas introduced through the main member250is a contaminant-containing gaseous phase, and may be, for example, unpurified atmosphere, but is not limited thereto.

Specifically, the sensor650may be a known chemical sensor capable of detecting various contaminants. For example, a semiconductor type gas sensor using an oxide semiconductor material, an ionization type gas sensor that detects VOC by making the VOC collide with electrons and ionizing the VOC, or a catalytic combustion type gas sensor using catalysts, such as palladium and platinum, and alumina carrier may be exemplified. As a specific example, the semiconductor gas sensor may be a sensor using metal oxides such as SnO2, TiO2, ZrO, and In2O3, and may be a sensor that measures the concentration and type of gas by using a surface reaction of the sensor generated by adsorption and desorption of ambient gas, but is not limited thereto. Unlike illustrated in the drawings, a plurality of sensors may be provided according to the type and number of contaminants.

The concentrator part450of the present invention is to adsorb and concentrate various contaminants and move the contaminants to the sensor, and includes an adsorbent460capable of adsorbing the contaminants and a desorption means470capable of desorbing the contaminants. The adsorbent460may adsorb various contaminants or any one type of contaminants. The desorption means470is positioned adjacent to each adsorbent460and heats the adsorbents to individually desorb the contaminants from the adsorbent460. For example, when various contaminants having different desorption temperatures are attached to the adsorbent450made of one type of material, the contaminants may be individually desorbed by adjusting the temperature applied to the adsorbent450through the desorption means470.

Unlike this, a plurality of adsorbents are arranged, but at least two or more adsorbents460are made of different materials and may adsorb different contaminants. In this case, the desorption means470is provided in the same number as the adsorbent and is located adjacent to each adsorbent to desorb the contaminants adsorbed to each adsorbent.

Specifically, when only any one type (hereinafter referred to as first contaminant) of contaminants is to be sensed, by operating the desorption means470adjacent to the adsorbent460made of a material capable of adsorbing the first contaminant, only the first contaminant may be delivered to the sensor650and sensed. In addition, when two or more types of contaminants are sensed, by operating the desorption means470adjacent to the two adsorbents460to which the two types of contaminants are respectively adsorbed, two types of contaminants may be delivered to the sensor650and sensed. As described above, as the concentrator part450of the present invention may selectively deliver the concentrated contaminant to the sensor650, it is possible to improve the selectivity of the sensor650in sensing contaminants, and as the contaminants that are desorbed at the same temperature may be separated and desorbed, it is possible to perform the sensing with higher selectivity.

In one embodiment of the present invention, as illustrated in the drawing, the concentrator part450partitions the main flow path250aand may include a plurality of adsorbents460installed inside the main member250. The adsorbent460may be provided in a porous adsorption structure in which the adsorbent460is in contact with gas to adsorb the contaminants, but is formed with fine pores so that gas may pass through.

Specifically, a specific surface area of the porous adsorption structure may be 500 to 5000 m2/g, and more specifically 1000 to 3000 m2/g, but is not limited thereto. A micropore size in the porous adsorption structure is not limited to meso-pores in the range of 2 to 50 nm or macropores in the range of 50 to 500 nm, but a pore volume is 0.1 to 5 cm3/g on average and specifically 0.2 to 3 cm3/g. In addition, the adsorption capacity of the porous adsorption structure may be 10 to 2000 mg/g, and specifically, 50 to 1500 mg/g.

As described above, the adsorbent460provided in the porous adsorption structure may be arranged in various ways, but may be arranged at equal intervals along the moving direction of the gas in the main flow path250a. Therefore, when the desorption means470to be described later is installed adjacent to each adsorbent460, it may be easy to design the position of the desorption means470so that one desorption means470affects only one adsorbent460.

As described above, at least two or more adsorbents460of the concentrator part450may be made of different materials, and may adsorb different contaminants. Specifically, in the concentrator part450of the present invention, assuming that the adsorbents460arranged along the gas movement direction of the main flow path250aare sequentially first to third adsorbents461,463, and465, the first to third adsorbents461,463, and465may all be made of different materials, whereas the first and third adsorbents461and465may be made of the same material, and the second adsorbent463may be made of a material different from that of the first and third adsorbents461and465. In such a concentrator part450, the same type of contaminant may be adsorbed to the adsorbent460made of the same material, and a different type of contaminants may be adsorbed to the adsorbent460made of a different material.

For example, the first adsorbent461may be made of a hydrophilic material capable of advantageously adsorbing moisture, and the second adsorbent463may be made of a hydrophobic material capable of advantageously adsorbing organic solvents. Specifically, the first adsorbent461may contain any one or two or more materials selected from the group consisting of activated clay, silica gel, activated alumina, and synthetic zeolite, and the second adsorbent463may contain any one or two or more materials selected from the group consisting of charcoal, bone charcoal, and activated carbon. The adsorbent460of the present invention is not limited thereto, and all the conventional adsorbents460capable of adsorbing the contaminants contained in gas may be applied, but at least two of the plurality of adsorbents460may be made of a different material from each other and adsorb different contaminants.

The desorption means470is located adjacent to each of the plurality of adsorbents460to individually desorb the contaminants from the adsorbent460, and all the conventional desorption means470capable of desorbing the adsorbed material from the adsorbent460can be applied. For example, the desorption means470may be an air supplier capable of detaching the contaminant adsorbed to the adsorbent460by supplying the carrier gas, or a vibrating body capable of desorbing the contaminant by vibrating the adsorbent460. Preferably, the desorption means470may be a heating body472that heats each adsorbent460to desorb the contaminant from the adsorbent460. As the heating body472desorbs the contaminant from the adsorbent460through heat supply, the desorption speed of the contaminant is fast. Accordingly, a low-concentration air pollutant enrichment kit of the present invention may enable faster sensing.

As the heating body472, all of the conventional heating body472capable of supplying heat energy to heat the adsorbent460can be applied, but preferably, the heating body472may be a resistor that generates Joule-heating, and the resistor may easily supply and stop heat energy depending on whether or not power is applied to easily heat each adsorbent460individually. As illustrated in the drawings, the heating body472is a ring-shaped member having a certain area and may be positioned to surround an outer surface of the main member250where each adsorbent is located.

When the number of adsorbents460is provided, the same number of heating bodies472may be provided. As a specific example, assuming that three adsorbents460are provided and that the first to third adsorbents461,463, and465are sequentially along the moving direction of gas, the heating body472may be divided into a first heating body471formed to surround the outer surface of the main member250where the first adsorbent461is located, a second heating body473formed to surround the outer surface of the main member250where the second adsorbent463is located, and a third heating body475formed to surround the outer surface of the main member250where the third adsorbent465is located. As illustrated in the drawings, the shape and structure of the heating body472capable of heating each of the plurality of adsorbents460, such as a spiral heating wire and a linear heating wire, are not limited and may be applied.

The sub-member350forms a sub-flow path350abranched from the main flow path250a, and allows gas passing through the adsorbent460to be discharged to the outside without moving to the sensor650. As illustrated in the drawings, the sub-member350may be provided as a tubular member, but is not limited thereto. The sub-flow path350aof the sub member350may be opened and closed by a second valve351. When the second valve351is opened, the gas passing through the concentrator part450may be discharged to the outside through the sub-flow path of the sub-member350. Unlike this, when the second valve351is closed, the gas passing through the concentrator part450may move to the sensor650.

The low-concentration air pollutant selective detection device including the concentrator part450may operate by the control unit750installed adjacent to the main flow path250a. In addition, necessary power may be provided by a battery850installed adjacent thereto. In the drawings, the control unit750and the battery850are located inside the same housing, but otherwise, the control unit750and the battery850may be located in separate bodies.

FIG.3illustrates a low-concentration air pollutant selective detection device including a concentrator part according to another embodiment of the present invention.

Referring toFIG.3, the desorption means of the concentrator part may be provided in a heating structure570, and the adsorbent may be provided by coating the surface of the heating structure570with an adsorbent571. In such a concentrator part, a contaminant may be adsorbed in proportion to a surface area formed with the heating structure570by the adsorption material571coated on the surface of the heating structure570. In addition, when the heating structure570generates heat after the contaminant is concentrated in the adsorption material571, heat energy may be uniformly delivered to the adsorption material571coated on the surface of the heating structure570. Due to this, a large amount of contaminant may be desorbed in a relatively quick time, and the high-sensitivity sensing may be quickly performed.

Specifically, the heating structure570is installed to partition the main flow path250a, and as illustrated in the drawings, a plurality of heating structures570may be arranged in a row.

The heating structure is a resistor that generates Joule-heating, and may be any one metal of iron (Fe), chromium (Cr), aluminum (Al), nickel (Ni), platinum (Pt), molybdenum (Mo), tungsten (W), and tantalum (Ta) or an alloy thereof. Alternatively, the heating structure is any one of silicon carbide (SiC)-based, molybdenum silicide (MoSi2)-based, carbon-based, and zirconia-based heating elements, but is not limited thereto. For example, the heating structure may be made of SiC. The form of the heating structure570may have a monolith structure including a plurality of channels opened in a direction parallel to the flow path formation direction of the main flow path, and specifically, may be provided in a honeycomb-monolith structure.

Such a heating structure570may be arranged in various ways in the main flow path250a, but as illustrated in the drawings, the heating structure570may be spaced apart at equal intervals along the moving direction of the gas in the main flow path250a. Accordingly, it is possible to prevent mutually adjacent heating structures570from interfering with each other.

In this case, the heating structures570may each be coated with different adsorption materials. Specifically, assuming that the heating structures570arranged along the moving direction of gas of the main flow path250aare sequentially first to third heating structures571,573, and575, all of the first to third heating structures571,573, and575may be coated with different adsorption materials. Unlike this, the first and third heating structures571and575are coated with the same adsorption material, and the second heating structure573is coated with an adsorption material different from that of the first and third heating structures571and575. In this way, the same kind of adsorption material561may be adsorbed to the heating structure570coated with the same adsorption material, and different kinds of contaminants may be adsorbed to the heating structure570coated with a different adsorption material561.

The adsorption material561is an adsorbent known in the art, and the usable adsorption material is not limited. For example, the adsorption material may be provided as a hydrophilic material that may advantageously adsorb moisture or a hydrophobic material that may advantageously adsorb organic solvents. Specifically, the adsorption material may contain any one or two or more selected from the group consisting of silica gel, activated alumina, synthetic zeolite, charcoal, bone charcoal, activated carbon, metal organic frameworks (MOF), hypercrosslinked polymeric resin (HPR), and zeolites.

In the low-concentration air pollutant selective detection device having a concentrator part including the heating structure570coated with such an adsorption material561, the heating structure570may generate heat by electrical application, and the contaminant adsorbed on the adsorption material561coated on the surface of the heating structure may be desorbed.

As illustrated inFIG.4, the low-concentration air pollutant selective detection device of the present invention may include the plurality of concentrator parts450. In this case, the concentrator part450may be connected in parallel to the main flow path250a. In this way, in the low-concentration air pollutant selective detection device, in which the plurality of concentrator parts450are connected in parallel to the main flow path250a, various types of adsorbents can be installed, so that more various types of contaminants may be selectively sensed.

The low-concentration air pollutant selective detection device of the present invention described above has excellent sensing sensitivity as the concentrated contaminant is delivered to the sensor, and may selectively sense the required contaminant.

The method of selectively detecting low-concentration air pollutants of the present invention includes: an adsorption mode including a step of adsorbing different contaminants included in gas to adsorbents of different materials included in a concentrator part, respectively; and a desorption mode including a step of individually detaching different contaminants from the adsorbent and moving the contaminants to a sensor by a desorption means positioned adjacent to the adsorbent, in which the adsorption mode and the desorption mode may be selectively performed. Such a detection method may selectively sense the concentrated contaminant for each type when necessary.

Specifically, the adsorption mode includes a step in which a main flow path is opened and gas is introduced into the concentrator part located in the main flow path; a step of adsorbing different contaminants to each adsorbent, and a step in which the gas passing through the adsorbent is discharged through a sub-flow path branched from the main flow path. Such an adsorption mode continuously proceeds for a certain period of time, and the air pollutant may be concentrated in the concentrator part. The execution time of the adsorption mode may proceed without limitation as long as the execution time is a time when the air pollutant may be sufficiently adsorbed to the adsorbent.

The desorption mode may include a step of desorbing the contaminant from the adsorbent by any one or two or more desorption means selected from a desorption means positioned adjacent to each adsorbent, a step of moving the desorbed contaminant to a sensor along the main flow path, and a step of measuring information including a concentration of the contaminant by the sensor. Such an adsorption mode and desorption mode may be selectively performed, but preferably, in the adsorption mode, the desorption mode may proceed after a certain period of time set so that the air pollutant may be sufficiently concentrated.

Hereinafter, the detection method according to the embodiment of the low-concentration air pollutant selective detection device according to the embodiment of the present invention will be described in detail.

In the adsorption mode of the control unit, the first valve251installed in the main member250is opened, and the outside atmosphere flows in along the main flow path250aand passes through the concentrator part450in which the plurality of adsorbents460are arranged in a row. In addition, the second valve351installed in the sub member350is opened, and the gas passing through the concentrator part450moves through the sub-flow path350aand is discharged to the outside. The adsorption mode may be maintained for a certain period of time so that the contaminant may be sufficiently adsorbed to the adsorbent460of the concentrator part450.

Thereafter, when a set period of time elapses, the control unit performs the detachment mode. In the desorption mode, the second valve351installed in the sub-member350is closed, and the heating body472, which is the desorption means470, operates to supply heat energy, thereby desorbing the concentrated contaminant from the adsorbent460. As the second valve351is closed, the concentrated contaminant may move to the sensor650instead of the sub-member350, a pump651connected to the main flow path250amay be further provided so that the contaminant may easily move to the sensor650, and the pump651operates. In the desorption mode, only one contaminant may be selectively detached by operating only one heating body472among the first to third heating bodies471,473, and475according to the type of contaminant to be sensed. Unlike this, only two heating bodies472among the first to third heating bodies471,473, and475may operate, and all of the first to third heating bodies471,473, and475may operate.

Hereinafter, the present invention will be described in more detail through Examples. However, the following Inventive Examples are only one reference example for describing the present invention in detail, and the present invention is not limited thereto and may be implemented in various forms.

In addition, unless otherwise defined, all technical and scientific terms have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terms used in the description herein are for the purpose of effectively describing particular embodiments only and are not intended to limit the invention.

As illustrated inFIG.5, after the heating structure with zeolite H-beta (Sigma-Aldrich) coated on the surface thereof was installed in the main flow path of the detection device according to the embodiment of the present invention as the concentrator part, at room temperature, 1 ppm of toluene gas was injected into the main flow path. The toluene gas was supplied through a fan. The heating structure used was made of SiC, and a honeycomb monolith structure was used. The sensor unit used a metal oxide-based electrical resistance change sensor as a commercially available TVOC sensor.

FIGS.6and7are graphs showing the comparison of the toluene gas sensing values of the detection device according to the presence or absence of the concentrator part of Example 1. Specifically,FIG.6is a toluene sensing value of the sensor unit when there is no concentrator part, andFIG.7is a toluene sensing value of Example 1. More specifically, after adsorbing and concentrating toluene at room temperature for 15 minutes, a voltage was applied to the heating structure (SiC) to heat the heating structure (SiC), thereby desorbing the concentrated toluene and supplying the concentrated toluene to the sensor unit.

As can be seen inFIG.7, it was confirmed that the high concentration of toluene was injected into the sensing unit of the sensor due to the desorption of concentrated (adsorbed) toluene when the heating was set to 180° C., and the sensitivity reacted by about 0.2, and when the desorption temperature reached 250° C., the detection more than a sensitivity value of 2 is possible. That is, it was confirmed that the high-sensitivity sensing of the low-concentration air pollutant is possible through the detection device of the present invention.

Hereinabove, although the present invention has been described by specific matters, limited embodiments, and the accompanying drawings, they have been provided only for assisting in the entire understanding of the present invention. Therefore, the present invention is not limited to the exemplary embodiments. Various modifications and changes may be made by those skilled in the art to which the present invention pertains from this description.

Therefore, the spirit of the present invention should not be limited to these exemplary embodiments, but the claims and all of modifications equal or equivalent to the claims are intended to fall within the scope and spirit of the present invention.