Method of making a transparent conductive composite material

Patent metadata

Field	Value
Publication number	US-10478899-B2
Application number	US-201715596636-A
Country	US
Kind code	B2
Filing date	May 16, 2017
Priority date	Jun 11, 2014
Publication date	Nov 19, 2019
Grant date	Nov 19, 2019

Abstract

A method of making a transparent conductive material includes: preparing a reactive solution that contains a solvent, a metal salt which is dissolved in the solvent, and a powder of graphene oxide which is dispersed in the solvent; and simultaneously reducing metal ions of the metal salt and the graphene oxide in the reactive solution to form a plurality of core-shell nanowires, each of which includes a core of a metal reduced from the metal ions, and a shell of graphene surrounding the core.

First claim

What is claimed is:

1. A method of making a transparent conductive material, comprising steps of:
a) preparing a precursor solution that contains a metal salt, a templating reagent, a buffer agent, and a first solvent which also serves as a reducing agent;
b) preparing a graphene oxide solution by dispersing a graphene oxide in a second solvent which is miscible with the first solvent; and
c) slowly adding the graphene oxide solution to the precursor solution at an elevated temperature of no smaller than 150° C. and less than 290° C. so as to permit growth of graphene on metal nanowire seeds which are formed as a result of a reduction of the metal salt to thereby obtain a network structure which includes a plurality of core-shell nanowires interconnected to each other and a plurality of nanowebs of graphene extending from the core-shell nanowires.

2. The method of claim 1 , wherein the first solvent is a polyhydroxy alcohol.

3. The method of claim 2 , wherein the polyhydroxy alcohol is selected from the group consisting of ethylene glycol, propylene glycol, butylene glycol, neopentyl glycol, glycerin, and combinations thereof.

4. The method of claim 1 , wherein the metal salt is selected from the group consisting of silver nitrate, silver perchlorate, and silver fluoride.

5. The method of claim 1 , wherein the templating reagent is selected from the group consisting of polyvinylpyrrolidone, polyvinyl alcohol, poly(dimethylsiloxane), poly(oxyethylene), and combinations thereof.

6. The method of claim 1 , wherein the buffer agent is selected from the group consisting of a metal halide, a metal sulfide, and a metal nitrate.

7. The method of claim 6 , wherein the metal halide is silver bromide or silver chloride.

8. The method of claim 1 , further comprising, prior to step c), a step of heating the precursor solution up to the elevated temperature to initiate the reduction of a portion of the metal salt to form the metal nanowire seeds.

9. The method of claim 1 , wherein the second solvent is selected from the group consisting of ethylene glycol, propylene glycol, butylene glycol, neopentyl glycol, glycerin, and combinations thereof.

Assignees

• Univ Nat Tsing Hua

Inventors

• Tai Nyan-Hwa
• Lai Yi-Ting

Classifications

• C01B32/194

  After-treatment · CPC title

• H01B1/02

  mainly consisting of metals or alloys · CPC title

• B22F2998/10

  Processes characterised by the sequence of their steps · CPC title

• B82Y40/00

  Manufacture or treatment of nanostructures · CPC title

• H01B1/08

  oxides · CPC title