Method for in-site synthesis of transparent conductive coating of poly(3,4-ethylenedioxythiophene)/nano silver

Patent metadata

Field	Value
Publication number	US-2018072896-A1
Application number	US-201715822257-A
Country	US
Kind code	A1
Filing date	Nov 27, 2017
Priority date	May 25, 2015
Publication date	Mar 15, 2018
Grant date	—

Abstract

A method for in-site synthesis of transparent conductive coating of poly(3,4-ethylenedioxythiophene)/nano silver hybrid on transparent substrate is provided. Transparent substrate with oxidant coating containing silver salt is immersed into 3,4-ethylenedioxythiophene (EDOT) solution. The oxidant turns EDOT monomer to poly(3,4-ethylenedioxythiophene) (PEDOT) coating on the transparent substrate; meanwhile, the silver salt itself is reduced to nano silver by the EDOT monomer, resulting in a nano silver-doped PEDOT coating. Thereby, a transparent conductive film made of PEDOT/nano silver coating on transparent substrate is obtained. The transparent conductive film with PEDOT/nano silver coating prepared in the present invention possesses the advantages of high electrical conductivity, optical transparency and environmental stability.

First claim

What is claimed is:

1 . A method for in-site synthesis of transparent conductive coating of poly(3,4-ethylenedioxythiophene)/nano silver hybrid on a transparent substrate, comprising in-site synthesis of poly(3,4-ethylenedioxythiophene) and nano silver on a transparent substrate simultaneously.

2 . The method according to claim 1 , comprising immersing a transparent substrate with oxidant coating containing silver salt and other oxidants into 3,4-ethylenedioxythiophene solution, wherein on the transparent substrate the oxidant coating containing silver salt and other oxidants will turn 3,4-ethylenedioxythiophene to transparent conductive coating of poly(3,4-ethylenedioxythiophene) by chemical oxidative polymerization; meanwhile, the 3,4-ethylenedioxythiophene will turn the silver salt to metal silver by chemical reduction, resulting in the coating of poly(3,4-ethylenedioxythiophene)/nano silver hybrid on the transparent substrate.

3 . The method according to claim 2 , wherein the silver salt, can be silver p-tolueuesulfonate or silver nitrate or a mixture of silver p-toluenesulfonate and silver nitrate; and the molar percent of the silver salt in the oxidant coating is 50-100%; the other oxidants in the oxidant coating contain ferric salt; the content of the oxidant coating on a surface of the transparent substrate is 0.5-10 mmol/m 2 .

4 . The method according to claim 2 , wherein the 3,4-ethylenedioxythiophene solution contains dissolved polyvinylpyrrolidone; the average molecular weight of the polyvinylpyrrolidone is 10000-100000 g/mol; and the mass concentration of the polyvinylpyrrolidone in the 3,4-ethylenedioxythiophene solution is 0.01-2%.

5 . The method according to claim 2 , wherein the 3,4-ethylenedioxythiophene solution contains 20-400 mmol/L of 3,4-ethylenedioxythiophene; the solvent for the 3,4-ethylenedioxythiophene solution is selected at least one from the following solvents; petroleum ether, hexane, heptane, cyclohexane, benzene, methylbenzene, chloroform, acetonitrile, methanol, ethanol and butanol.

6 . The method according to claim 3 , wherein the ferric salt can be selected at least one from ferric p-toluenesulfonate, ferric trichloride and ferric sulfate; and the molar percent of the p-toluenesulfonate in the oxidant coating is above 40%.

7 . The method according to claim 1 , wherein the poly(3,4-ethylenedioxythiophene)/nano silver hybrid is synthesized in EDOT solution at temperature 40-80° C.; the time period of the synthesizing reaction is 0.1-2 hours; just after the synthesizing reaction, the resultant poly(3,4-ethylenedioxythiophene)/nano silver hybrid is immersed in a dilute solution of ferric salt and then cleaned.

8 . The method according to claim 1 , wherein the transparent substrate is made of glass, poly(methyl methacrylate), polycarbonate, poly(ethylene terephthalate), poly(ethylene naphthalate), cycloolefin polymers, polyimide, cured epoxy resin or organic silicone resin.

9 . The method according to claim 1 , wherein the transparent substrate is a transparent substrate with preformed conductive coating of poly(3,4-ethylenedioxythiophene).

10 . The method according to claim 1 , wherein the transparent substrate is subjected to surface treatment before coating oxidants; the surface treatment comprises chemical surface modification or vacuum ultraviolet surface modification; the chemical surface modification refers to hydrolysis or sulfonation; and the vacuum ultraviolet surface modification refers to photochemical oxidation with 172 nm vacuum ultraviolet.

Assignees

• Univ South China Tech

Inventors

• Li Jianxiong
• Ma Yaxiao
• Liu Anhua

Classifications

• C08J7/0427

  with only one layer of a composition containing a polymer binder (with more layers C08J7/042) · CPC title

• C08G61/126

  with a five-membered ring containing one sulfur atom in the ring · CPC title

• C08G2261/1424

  containing ether groups, including alkoxy · CPC title

• H01B1/128

  comprising six-membered aromatic rings in the main chain, e.g. polyanilines, polyphenylenes · CPC title

• C08G2261/964

  coating of inorganic particles · CPC title