Transparent conducting films containing single-walled carbon nanotubes dispersed in an azo dye

Patent metadata

Field	Value
Publication number	US-2017129804-A1
Application number	US-201715411464-A
Country	US
Kind code	A1
Filing date	Jan 20, 2017
Priority date	May 1, 2014
Publication date	May 11, 2017
Grant date	—

Abstract

Described are carbon nanotube dispersions containing single-walled carbon nanotubes dispersed in a dispersant solution comprising a solvent (water, organic polar protic solvents, and/or organic polar aprotic solvents), and an azo compound. The single-walled carbon nanotubes are not cross-linked with covalent bonds. The dispersions are useful for fabricating transparent conductive thin films on flexible and inflexible substrates. Methods for making the transparent conductive thin films are also described.

First claim

What is claimed is:

1 . A method of making a flexible, transparent, conductive film, the method comprising:
providing a dispersion of single-walled carbon nanotubes in a solution comprising a solvent selected from the group consisting of water, organic polar protic solvents, and organic polar aprotic solvents, and an azo compound comprising at least one azo moiety; contacting the dispersion on a substrate, and then removing the solution; wherein a flexible, transparent, conductive film is formed on the substrate, and wherein the single-walled carbon nanotubes are not covalently cross-linked.

2 . The method of claim 1 , comprising contacting the dispersion on a flexible substrate.

3 . The method of claim 1 , comprising contacting the dispersion on a flexible substrate selected from the group consisting of PET and PDMS.

4 . The method of claim 1 , comprising contacting the dispersion on a glass substrate.

5 . The method of claim 1 , wherein the azo compound comprises at least two azo moieties.

6 . The method of claim 1 , wherein the azo compound comprises at least one sulfonic acid moiety.

7 . The method of claim 1 , wherein the azo compound comprises at least two sulfonic acid moieties.

8 . The method of claim 1 , wherein the azo compound is selected from the group consisting of:

wherein each R is identical or different and each R is independently selected from the group consisting of amino-substituted phenyl and amino-substituted naphthyl,

9 . The method of claim 8 , wherein at least one R is further substituted with at least one sulfonic acid moiety.

10 . The method of claim 1 , wherein the azo compound is 3,3′-([1,1′-biphenyl]-4,4′-diyl)bis(4-aminonaphthalene-1-sulfonic acid (Congo red).

11 . A flexible, transparent, conductive film fabricated by:
providing a dispersion of single-walled carbon nanotubes in a solution comprising a solvent selected from the group consisting of water, organic polar protic solvents, and organic polar aprotic solvents, and an azo compound comprising at least one azo moiety; contacting the dispersion on a substrate, and then removing the solution; wherein a flexible, transparent, conductive film is formed on the substrate, and wherein the single-walled carbon nanotubes are not covalently cross-linked.

12 . The flexible, transparent, conductive film of claim 11 , comprising contacting the dispersion on a flexible substrate.

13 . The flexible, transparent, conductive film of claim 11 , comprising contacting the dispersion on a flexible substrate selected from the group consisting of PET and PDMS.

14 . The flexible, transparent, conductive film of claim 11 , comprising contacting the dispersion on a glass substrate.

15 . The flexible, transparent, conductive film of claim 11 , wherein the azo compound comprises at least two azo moieties.

16 . The flexible, transparent, conductive film of claim 11 , wherein the azo compound comprises at least one sulfonic acid moiety.

17 . The flexible, transparent, conductive film of claim 11 , wherein the azo compound comprises at least two sulfonic acid moieties.

18 . The flexible, transparent, conductive film of claim 11 , wherein the azo compound is selected from the group consisting of:

wherein each R is identical or different and each R is independently selected from the group consisting of amino-substituted phenyl and amino-substituted naphthyl,

19 . The flexible, transparent, conductive film of claim 18 , wherein at least one R is further substituted with at least one sulfonic acid moiety.

20 . The flexible, transparent, conductive film of claim 11 , wherein the azo compound is 3,3′-([1,1′-biphenyl]-4,4′-diyl)bis(4-aminonaphthalene-1-sulfonic acid (Congo red).

Assignees

• Wisconsin Alumni Res Found

Inventors

• Gunasekaran Sundaram
• Sundramoorthy Ashok Kumar

Classifications

• C03C2217/70

  Properties of coatings · CPC title

• C09D1/00

  Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances · CPC title

• C03C2217/465

  having a specific shape · CPC title

• C03C17/007

  containing a dispersed phase, e.g. particles, fibres or flakes, in a continuous phase · CPC title

• C09D7/1233

  Chemistry & Metallurgy · mapped topic