Methods for production of silver nanostructures

Patent metadata

Field	Value
Publication number	US-9388480-B2
Application number	US-201514788519-A
Country	US
Kind code	B2
Filing date	Jun 30, 2015
Priority date	Feb 1, 2006
Publication date	Jul 12, 2016
Grant date	Jul 12, 2016

Abstract

Methods for producing silver nanostructures with improved dimensional control, yield, purity, monodispersity, and scale of synthesis.

First claim

The invention claimed is:

1. A method of producing silver nanowires, the method comprising:
providing a mixture including at least one halide, at least one silver precursor, and at least one capping agent in at least one polyol solvent, wherein the mixture comprises the at least one halide at a concentration ranging from about 0.1 mM to about 0.4 mM;
allowing the mixture to react whereby the at least one silver precursor is reduced to silver nanowires; and
isolating the silver nanowires from the mixture.

2. The method of claim 1 , wherein the at least one halide is a chloride.

3. The method of claim 2 , wherein the chloride comprises hydrochloric acid or sodium chloride.

4. The method of claim 1 , wherein the mixture is heated to a temperature up to about 150° C.

5. The method of claim 1 , wherein the mixture is maintained at a temperature up to about 150° C.

6. The method of claim 1 , wherein the mixture comprises the at least one silver precursor at a concentration ranging from about 20 mM to about 30 mM.

7. The method of claim 6 , wherein the at least one silver precursor is silver nitrate.

8. The method of claim 1 , wherein the at least one capping agent is polyvinyl pyrrolidone (PVP) and the mixture comprises PVP at a concentration ranging from about 30 mM to about 40 mM.

9. A method of producing silver nanowires, the method comprising:
forming a mixture comprising halide ions, silver ions, at least one capping agent, and at least one polyol, wherein the mixture comprises the halide ions at a concentration ranging from about 0.1 mM to about 0.4 mM;
forming silver nanowires by reducing the silver ions; and
isolating the silver nanowires from the mixture.

10. The method of claim 9 , wherein the halide ions are chloride ions.

11. The method of claim 9 , wherein forming silver nanowires comprises heating the mixture to a temperature up to about 150° C.

12. The method of claim 9 , wherein the mixture is maintained at a temperature up to about 150° C.

13. The method of claim 9 , wherein the mixture comprises silver ions at a concentration ranging from about 20 mM to about 30 mM.

14. The method of claim 13 , wherein the silver ions are derived from silver nitrate.

15. The method of claim 9 , wherein the at least one capping agent is polyvinyl pyrrolidone (PVP) and the mixture comprises PVP at a concentration ranging from about 30 mM to about 40 mM.

Assignees

• Univ Washington

Inventors

• Xia Younan
• Im Sang-Hyuk
• Sun Yugang
• Lee Yun Tack
• Wiley Benjamin

Classifications

• B22F1/0553

  Complex form nanoparticles, e.g. prism, pyramid, octahedron · CPC title

• B22F1/0547

  Nanofibres or nanotubes · CPC title

• B22F9/24 Primary

  starting from liquid metal compounds, e.g. solutions · CPC title

• C30B7/00

  Single-crystal growth from solutions using solvents which are liquid at normal temperature, e.g. aqueous solutions (from molten solvents C30B9/00; by normal or gradient freezing C30B11/00; under a protective fluid C30B27/00) · CPC title

• C30B29/02

  Elements · CPC title