PROCESS FOR PRODUCING TRANSPARENT CONDUCTIVE FILMS, TRANSPARENT CONDUCTIVE FILM, PROCESS FOR PRODUCING CONDUCTIVE FIBERS, CONDUCTIVE FIBER, CARBON NANOTUBE/CONDUCTIVE POLYMER COMPOSITE DISPERSION, PROCESS FOR PRODUCING CARBON NANOTUBE/CONDUCTIVE POLYMER COMPOSITE DISPERSIONS, AND ELECTRONIC DEVICE

• US 20120145968A1
• Filed: 12/01/2011
• Published: 06/14/2012
• Est. Priority Date: 12/10/2010
• Status: Abandoned Application

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Shimizu, Keisuke
• Application Number:
  US13/309,186
• Publication Number:
  US 20120145968A1
• Time in Patent Office: Days
• US Class Current: 252/511
• CPC Class Codes: B82Y 30/00 Nanotechnology for materials or surface science, e.g. nanocomposites
• CPC Class Codes: C08G 2261/1424 containing ether groups, including alkoxy
• CPC Class Codes: C08G 2261/3223 containing one or more sulfur atoms as the only heteroatom, e.g. thiophene
• CPC Class Codes: C08G 2261/512 Hole transport
• CPC Class Codes: C08G 2261/794 with polymeric dopants
• CPC Class Codes: C08J 5/005 Reinforced macromolecular compounds with nanosized materials, e.g. nanoparticles, nanofibres, nanotubes, nanowires, nanorods or nanolayered materials
• CPC Class Codes: C08K 3/041 Carbon nanotubes
• CPC Class Codes: C08K 7/24 inorganic
• CPC Class Codes: C08K 9/02 Ingredients treated with inorganic substances
• CPC Class Codes: C08K 9/04 Ingredients treated with organic substances treated with macromolecular compounds C08K9/08
• CPC Class Codes: C08L 25/18 Homopolymers or copolymers of aromatic monomers containing elements other than carbon and hydrogen
• CPC Class Codes: C08L 65/00 Compositions of macromolecular compounds obtained by reactions forming a carbon-to-carbon link in the main chain C08L7/00 - C08L57/00, C08L61/00 take precedence; Compositions of derivatives of such polymers
• CPC Class Codes: D06M 11/74 with carbon or graphite; with carbides; with graphitic acids or their salts
• CPC Class Codes: D06M 15/63 containing sulfur in the main chain, e.g. polysulfones
• CPC Class Codes: D06M 23/08 Processes in which the treating agent is applied in powder or granular form adhesives for multi-layer textile fabrics D06M17/00
• CPC Class Codes: H01B 1/12 organic substances organic macromolecular compounds or compositions C08
• CPC Class Codes: H01B 1/24 the conductive material comprising carbon-silicon compounds, carbon or silicon
• CPC Class Codes: H10K 30/821 comprising carbon nanotubes
• CPC Class Codes: H10K 85/1135 Polyethylene dioxythiophene [PEDOT]; Derivatives thereof
• CPC Class Codes: Y02E 10/549 Organic PV cells

Abstract

A process for producing transparent conductive films includes mixing and dispersing a carbon nanotube having a hydrophilic group introduced on the surface thereof and a hydrophilic conductive polymer in a solvent to obtain a carbon nanotube/conductive polymer composite dispersion in which a weight ratio of the hydrophilic conductive polymer to the carbon nanotube is 0.5 or more and 4 or less, the concentration of the carbon nanotube being 0.1 g/L or more and 2.0 g/L or less, and attaching onto a transparent substrate the carbon nanotube/conductive polymer composite dispersion.

Claims

1. A process for producing transparent conductive films, comprising:

mixing and dispersing a carbon nanotube having a hydrophilic group introduced on the surface thereof and a hydrophilic conductive polymer in a solvent to obtain a carbon nanotube/conductive polymer composite dispersion in which a weight ratio of the hydrophilic conductive polymer to the carbon nanotube is 0.5 or more and 4 or less, the concentration of the carbon nanotube being 0.1 g/L or more and 2.0 g/L or less; and

attaching onto a transparent substrate the carbon nanotube/conductive polymer composite dispersion.

2. The process for producing transparent conductive films according to claim 1, wherein the weight ratio of the hydrophilic conductive polymer to the carbon nanotube is 1 or more and 2 or less.

3. The process for producing transparent conductive films according to claim 2, wherein the hydrophilic group is introduced by treating the surface of the carbon nanotube with an acid.

4. The process for producing transparent conductive films according to claim 3, wherein the acid is hydrochloric acid, hydrogen peroxide water, nitric acid or sulfuric acid.

5. The process for producing transparent conductive films according to claim 4, wherein a ratio of the absorbance at 750 nm wavelength light of the carbon nanotube/conductive polymer composite dispersion to the absorbance at 450 nm wavelength light thereof is 0.8 or more and 1.2 or less.

6. The process for producing transparent conductive films according to claim 5, wherein the surface of the transparent substrate is subjected to a hydrophilization treatment before the carbon nanotube/conductive polymer composite dispersion is attached onto the transparent substrate.

7. The process for producing transparent conductive films according to claim 6, wherein the surface of the transparent substrate is treated with UV rays or plasma to render the surface of the transparent substrate hydrophilic before the carbon nanotube/conductive polymer composite dispersion is attached onto the transparent substrate.

8. The process for producing transparent conductive films according to claim 6, wherein a silane coupling agent or a hydrophilic conductive polymer is applied to the surface of the transparent substrate to render the surface of the transparent substrate hydrophilic before the carbon nanotube/conductive polymer composite dispersion is attached onto the transparent substrate.

9. The process for producing transparent conductive films according to claim 6, wherein an antireflection treatment and/or a surface protection treatment is performed on the outermost surface of the transparent conductive film.

10. The process for producing transparent conductive films according to claim 6, wherein the transparent conductive film has a sheet resistivity of 10Ω

/□

to 10000Ω

/□ and

a total light transmittance of not less than 70%.

11. The process for producing transparent conductive films according to claim 6, wherein the transparent conductive film has a difference of not more than 5% between the transmittance at 750 nm wavelength light and the transmittance at 450 nm wavelength light.

12. A transparent conductive film produced by a process that comprises mixing and dispersing a carbon nanotube having a hydrophilic group introduced on the surface thereof and a hydrophilic conductive polymer in a solvent to obtain a carbon nanotube/conductive polymer composite dispersion in which a weight ratio of the hydrophilic conductive polymer to the carbon nanotube is 0.5 or more and 4 or less, the concentration of the carbon nanotube being 0.1 g/L or more and 2.0 g/L or less, and attaching onto a transparent substrate the carbon nanotube/conductive polymer composite dispersion.

13. The transparent conductive film according to claim 12, wherein the weight ratio of the hydrophilic conductive polymer to the carbon nanotube is 1 or more and 2 or less.

14. A process for producing conductive fibers, comprising:

mixing and dispersing a carbon nanotube having a hydrophilic group introduced on the surface thereof and a hydrophilic conductive polymer in a solvent to obtain a carbon nanotube/conductive polymer composite dispersion in which a weight ratio of the hydrophilic conductive polymer to the carbon nanotube is 0.5 or more and 4 or less, the concentration of the carbon nanotube being 0.1 g/L or more and 2.0 g/L or less; and

attaching onto the surface of a fiber the carbon nanotube/conductive polymer composite dispersion.

15. The process for producing conductive fibers according to claim 14, wherein the weight ratio of the hydrophilic conductive polymer to the carbon nanotube is 1 or more and 2 or less.

16. A conductive fiber produced by a process that comprises mixing and dispersing a carbon nanotube having a hydrophilic group introduced on the surface thereof and a hydrophilic conductive polymer in a solvent to obtain a carbon nanotube/conductive polymer composite dispersion in which a weight ratio of the hydrophilic conductive polymer to the carbon nanotube is 0.5 or more and 4 or less, the concentration of the carbon nanotube being 0.1 g/L or more and 2.0 g/L or less, and attaching onto the surface of a fiber the carbon nanotube/conductive polymer composite dispersion.

17. The conductive fiber according to claim 16, wherein the weight ratio of the hydrophilic conductive polymer to the carbon nanotube is 1 or more and 2 or less.

18. A carbon nanotube/conductive polymer composite dispersion wherein a carbon nanotube having a hydrophilic group introduced on the surface thereof and a hydrophilic conductive polymer are mixed and dispersed in a solvent so that a weight ratio of the hydrophilic conductive polymer to the carbon nanotube is 0.5 or more and 4 or less, the concentration of the carbon nanotube being 0.1 g/L or more and 2.0 g/L or less.

19. A process for producing carbon nanotube/conductive polymer composite dispersions, comprising:

mixing a hydrophilic conductive polymer and a carbon nanotube having a hydrophilic group introduced on the surface thereof so that the weight ratio of the hydrophilic conductive polymer to the carbon nanotube is 0.5 or more and 4 or less, and

dispersing the mixture in a solvent to a concentration of the carbon nanotube of 0.1 g/L or more and 2.0 g/L or less.

20. An electronic device including a transparent conductive film produced by a process that comprises mixing and dispersing a carbon nanotube having a hydrophilic group introduced on the surface thereof and a hydrophilic conductive polymer in a solvent to obtain a carbon nanotube/conductive polymer composite dispersion in which a weight ratio of the hydrophilic conductive polymer to the carbon nanotube is 0.5 or more and 4 or less, the concentration of the carbon nanotube being 0.1 g/L or more and 2.0 g/L or less, and attaching onto a transparent substrate the carbon nanotube/conductive polymer composite dispersion.