Source: http://www.google.com/patents/US7795125?dq=6,049,612
Timestamp: 2013-12-18 20:45:58
Document Index: 162270100

Matched Legal Cases: ['Application No. 60', 'art 500', 'art 500', 'art 500', 'art 700', 'art 700', 'art 900', 'art 1000', 'art 2200', 'art 2300', 'art 2500', 'art 2500', 'art 2700', 'art 2800', 'art 2800']

Patent US7795125 - System and process for producing nanowire composites and electronic ... - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inAdvanced Patent SearchPatentsThe present invention relates to a system and process for producing a nanowire-material composite. A substrate having nanowires attached to a portion of at least one surface is provided. A material is deposited over the portion to form the nanowire-material composite. The process further optionally includes...http://www.google.com/patents/US7795125?utm_source=gb-gplus-sharePatent US7795125 - System and process for producing nanowire composites and electronic substrates therefromAdvanced Patent SearchPublication numberUS7795125 B2Publication typeGrantApplication numberUS 12/274,904Publication dateSep 14, 2010Filing dateNov 20, 2008Priority dateAug 4, 2003Also published asCA2532991A1, CN1863954A, CN1863954B, EP1652218A2, US7091120, US7468315, US20050064185, US20070238314, US20090075468, US20100323500, WO2005017962A2, WO2005017962A3, WO2005017962A9Publication number12274904, 274904, US 7795125 B2, US 7795125B2, US-B2-7795125, US7795125 B2, US7795125B2InventorsMihai A. Buretea, Jian Chen, Calvin Y. H. Chow, Chunming Niu, Yaoling Pan, J. Wallace Parce, Linda T. Romano, David P. StumboOriginal AssigneeNanosys, Inc.Export CitationBiBTeX, EndNote, RefManPatent Citations (91), Non-Patent Citations (50), Referenced by (1), Classifications (42), Legal Events (2) External Links: USPTO, USPTO Assignment, EspacenetSystem and process for producing nanowire composites and electronic substrates therefromUS 7795125 B2Abstract The present invention relates to a system and process for producing a nanowire-material composite. A substrate having nanowires attached to a portion of at least one surface is provided. A material is deposited over the portion to form the nanowire-material composite. The process further optionally includes separating the nanowire-material composite from the substrate to form a freestanding nanowire-material composite. The freestanding nanowire material composite is optionally further processed into a electronic substrate. A variety of electronic substrates can be produced using the methods described herein. For example, a multi-color light-emitting diode can be produced from multiple, stacked layers of nanowire-material composites, each composite layer emitting light at a different wavelength.
CROSS-REFERENCE TO RELATED APPLICATION This application is a divisional of U.S. patent application Ser. No. 11/225,951, filed Sep. 14, 2005, now U.S. Pat. No. 7,468,315 which is a divisional of U.S. patent application Ser. No. 10/910,800, filed Aug. 4, 2004, now U.S. Pat. No. 7,091,120, which claims the benefit of U.S. Provisional Patent Application No. 60/491,979, filed Aug. 4, 2003, each of which is incorporated herein in its entirety.
SUMMARY OF THE INVENTION In a first aspect, the present invention relates to a system and process for producing a nanowire-material composite. A substrate is provided having nanowires attached to a portion of at least one surface. A material is deposited over the portion to form the nanowire-material composite. The nanowire-material composite is optionally separated from the substrate to form a freestanding nanowire-material composite.
DETAILED DESCRIPTION OF THE INVENTION Introduction It should be appreciated that the particular implementations shown and described herein are examples of the invention and are not intended to otherwise limit the scope of the present invention in any way. Indeed, for the sake of brevity, conventional electronics, manufacturing, semiconductor devices, and nanotube and nanowire technologies and other functional aspects of the systems (and components of the individual operating components of the systems) may not be described in detail herein. Furthermore, for purposes of brevity, the invention is frequently described herein as pertaining to a semiconductor transistor device. It should be appreciated that the manufacturing techniques described herein could be used to create any semiconductor device type, and other electronic component types. Further, the techniques would be suitable for application in electrical systems, optical systems, consumer electronics, industrial electronics, wireless systems, space applications, or any other application.
Nanowire Film Embodiments The present invention is directed to a method of harvesting nanowires and the use of nanowires in systems and devices to improve system and device performance. For example, the present invention is directed to the use of nanowires in semiconductor devices. According to the present invention, multiple nanowires are formed into a high mobility thin film and/or a nanowire-material composite. The thin film and/or composite of nanowires is used to harvest nanowires and/or in electronic devices to enhance the performance and manufacturability of the devices.
Example Applications of Nanowire Films of the Present Invention Nanowire Composite Embodiments In another aspect, the invention relates to a system and process for producing a nanowire-material composite. For example, FIG. 5 shows a flowchart 500 showing example steps for producing a nanowire-material composite, according to an embodiment of the present invention. FIGS. 6A-6C show example implementations of the steps of FIG. 5. Flowchart 500 begins with step 502. In step 502, a substrate having nanowires attached to a portion of at least one surface is provided. In step 504, a material is deposited over the portion to form the nanowire-material composite. Flowchart 500 optionally further includes step 506. In step 506, the nanowire-material composite is separated from the substrate to form a freestanding nanowire-material composite.
Embodiments for Depositing Oriented Nanowires In an embodiment, the invention relates to a system and process for depositing oriented nanowires. For example, FIG. 7 shows a flowchart 700 showing example steps for depositing oriented nanowires according to an embodiment of the present invention. FIGS. 8A-8F show example implementations of the steps of FIG. 7. Flowchart 700 begins with step 702. In step 702, a first substrate having nanowires attached to a portion of at least one surface is provided, wherein each nanowire has a first end attached to said portion. Preferably, the nanowires are oriented substantially perpendicular to the surface of the substrate. In step 704, a material is deposited over the portion to form a nanowire-material composite. In step 706, the nanowire-material composite is patterned to form a patterned composite. In step 708, the patterned composite is separated from the first substrate. In step 710, the patterned composite is applied to a second substrate such that the nanowires are aligned substantially parallel to the second substrate.
Electronic Substrate Embodiments In an embodiment, the present invention relates to a system and process for producing an electronic substrate. For example, FIG. 9 shows a flowchart 900 showing example steps for producing an electronic substrate, according to an embodiment of the present invention. FIG. 10 shows a flowchart 1000 showing optional steps that can be performed after step 906, and before step 908. FIG. 11A through FIG. 18B show example implementations of the steps for FIG. 9 and FIG. 10.
Light Emitting Diode Embodiments In an embodiment, the present invention relates to a flat-panel display comprising as the active layer a Light-Emitting Diode (LED). The LED comprises one or more nanowire-material composites having a plurality of independently and electrically addressable pixel sized diodes. Each addressable diode includes nanowires as the active light-emitting element.
Solution Based Processing Embodiments In an embodiment, the present invention relates to a method of forming a nanowire-material composite. FIG. 22 shows flowchart 2200 showing example steps for producing a nanowire-material composite using solution based methods, according to an embodiment of the present invention. In step 2202, nanowires are contacted with a material to form a mixture. Any material, such as material 608, shown in FIG. 6, can be used to form the mixture. The formation of the mixture can be facilitated by stirring, sonication or any other method known to one of ordinary skill in the art for dispersing nanowires in the material.
Nanowire Array Embodiments In an embodiment, the present invention relates to a nanowire array and a method of producing the same. FIG. 23A shows a flowchart 2300 showing example steps for producing a nanowire array, according to an embodiment of the invention. In step 2302, a nanowire-material composite is provided. The composite can be provided on a substrate or as a free-standing composite. The composite can comprise embedded nanowires that are oriented in any fashion. For example, the nanowires can be oriented perpendicular to the surface of the substrate or randomly oriented. The composite can be formed on the substrate, or formed as a freestanding composite and attached to the substrate in subsequent processing steps.
High Capacitance Capacitor Embodiments In an embodiment, the present invention relates to high capacitance capacitors including nanowire-material composites, and relates to methods of producing the same. FIG. 25A shows flowchart 2500 showing example steps for producing a high capacitance capacitor, according to an embodiment of the present invention. FIG. 25B shows an example capacitor 2550, produced according to an embodiment of the present invention. Flowchart 2500 begins with step 2502. In step 2502, a freestanding nanowire-material composite having nanowires oriented perpendicular to the composite surface is provided. For example, FIG. 25B shows nanowire-material composite 2552, having nanowires 2554 oriented perpendicular to the composite surface.
Flexible Nanocomposite Sheet and Nanofur Embodiments In an embodiment, the present invention relates to nanowire-material composite films comprising partially exposed nanowires oriented perpendicular to the surface of the composites and relates to methods for producing the same. FIG. 27A shows flowchart 2700 showing example steps in the preparation of composites comprising partially exposed nanowires. In step 2702, a nanowire-material composite film comprising embedded nanowires oriented perpendicular to the surface is provided. Alternatively, a mixture of nanowires and material is extruded to form a sheet of nanowire-material composite. The extrusion process orients the nanowires in the direction of fluid flow. In step 2704, a portion of the material is removed to partially expose the embedded nanowires. Any method known to one of skill in the relevant art can be used to remove the material, for example, plasma etching or organic solvents are used. FIG. 27B shows examples of the implementation of steps 2702 and 2704. Nanowire-material composite 2750 comprises material 2751 and nanowires 2752 embedded in material 2751 and oriented perpendicular to the composite surface. After step 2704, material 2751 is partially removed from composite 2750. Then, composite 2750 comprises nanowires 2752, wherein a portion 2754 of nanowires 2752 are exposed to produce nanofur.
Nanowire Composite Tube Embodiments In an embodiment, the present invention relates to nanowire-material composite tubes and processes for producing the same. FIG. 28A shows flowchart 2800 showing exemplary steps in the preparation of nanowire-material composite tubes. In step 2802, nanowires are contacted with a material to form a mixture. In step 2804, a mixture comprising nanowires and material is extruded to form a nanowire-material composite tube. Any method of extrudation known to one of skill in the relevant art can be used. Extrusion can be used to produce materials having various shapes. For example, the mixture can be extruded through a circular die to produce a tubular shape. In another example, the mixture can be extruded through a linear die to produce a sheet of composite. In optional step 2806, material is removed from the one or both of the outer and inner surfaces of the tube to partially expose the embedded nanowires. FIG. 28B shows examples of the implementation of the steps of flowchart 2800. FIG. 28B shows tubular nanowire-material composite 2850 comprising material 2854 and nanowires 2852 embedded therein. Tubular composite 2858 has a portion of material 2854 removed from the inner surface and comprises partially exposed nanowires 2856 and embedded nanowires 2852.
EXAMPLES Example 1 Preparation of Nanowire Composite With Nanowires Oriented Perpendicular to the Sheet Surface About 1.0 g of liquid polyethylene glycol diacrylate comprising about 10 mg of the photo initiator 2,2-dimethoxy-2-phenylacetophenone was placed in a glass vial. A silicon substrate, measuring about 1�3 cm was coated with 40 nm in diameter silicon nanowires. The nanowires were oriented substantially perpendicular to the surface of the substrate. The substrate was placed in the glass vial, with about 3 mm of one end of the substrate immersed in the liquid mixture. After about 15 minutes, the nanowires had wicked the liquid up to fill the spaces between them. The substrate was removed from the vial and placed under a UV lamp for about 15 min to polymerize the liquid. A nanocomposite coated substrate was thereby obtained, in which the nanowires were �frozen� at their original growth orientation.
Example 2 Preparation of Nanowire Composite With Nanowires Oriented Perpendicular to the Sheet Surface About 0.5 g poly(vinylidenefluoride) (PVDF) polymer was contacted with about 10 g of acetone. After a clear solution formed, about 11.6 mg of 40 nm Si nanowires was dispersed into the solution by sonication. About 5 g of the dispersion was transferred to a flat bottom glass dish with an inner diameter of about 35 mm. The dish was placed between a pair of electrodes and a DC field (about 3000 V/cm, with the negative (−) electrode applied to the top and positive (+) electrode applied to the bottom) was applied and the solvent was evaporated under the field.
Example 3 Preparation of Nanowire Composite With Random Nanowire Orientation About 13 mg of 40 nm Si nanowires was dispersed in about 1 g of polyethylene glycol diacrylate. About 10 mg photo initiator of 2,2-dimethoxy-2-phenylacetophenone was added. About 5 drops of the dispersion was placed between two glass slides with a gap of about 0.3 mm. The glass slide was placed under a UV lamp for 15 minutes to polymerize the polyethylene glycol diacrylate and yield a composite sheet with thickness of about 0.3 nm.
Example 4 Preparation of Nanowire Composite With Random Nanowire Orientation About 0.5 g PVDF polymer was added to about 10 g acetone. After a clear solution was formed, about 8.5 mg of 40 nm Si nanowires was dispersed into the solution by sonication. About 5 g of the dispersion was transferred to a flat bottom glass dish with an inner diameter of about 35 mm. The dish was loosely covered and placed in a hood to allow solvent evaporation. Upon evaporation of the solvent, a composite sheet with a thickness of about 0.09 mm was obtained.
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(1999) 121:11595-11596.50Scher, E.C. et al., "Shape control and applications of nanocrystals" Philosophical Transactions of the Royal Society London, Series A (2003) 361:241-257.Referenced byCiting PatentFiling datePublication dateApplicantTitleUS20100323500 *Aug 11, 2010Dec 23, 2010Nanosys, Inc.System and Process for Producing Nanowire Composites and Electronic Substrates Therefrom* Cited by examinerClassifications U.S. Classification438/602, 257/E21.464, 257/E21.17, 438/197, 257/E21.4, 257/E21.05, 438/603International ClassificationH01L33/24, H01L51/00, H01L33/06, H01L21/336, H01L29/423, H01L29/06, H01L51/05, H01L29/786, D02G3/00, H01L21/3205, H01L21/44, H01L21/28Cooperative ClassificationH01L29/0673, H01L29/78681, B82Y10/00, H01L29/42384, H01L29/0665, H01L33/24, H01L51/0048, H01L29/068, H01L33/06, H01L29/66742, H01L29/0676, H01L51/0545, H01L29/78696European ClassificationB82Y10/00, H01L29/06C6W4, H01L29/06C6W2, H01L29/06C6W6, H01L51/05B2B6, H01L29/786S, H01L29/66M6T6F15, H01L29/423D2B8, H01L29/786F, H01L29/06C6Legal EventsDateCodeEventDescriptionJun 12, 2013ASAssignmentOwner name: NANOSYS, INC., CALIFORNIAEffective date: 20130611Free format text: RELEASE BY SECURED PARTY;ASSIGNOR:NANOSYS, INC.;REEL/FRAME:030599/0907Apr 25, 2013ASAssignmentEffective date: 20121221Free format text: SECURITY AGREEMENT;ASSIGNOR:PRVP HOLDINGS, LLC;REEL/FRAME:030285/0829Owner name: NANOSYS, INC., CALIFORNIARotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services©2012 Google