Methods of controlling nanostructure formations and shapes

Patent metadata

Field	Value
Publication number	US-10195670-B2
Application number	US-201615234272-A
Country	US
Kind code	B2
Filing date	Aug 11, 2016
Priority date	Jun 21, 2006
Publication date	Feb 5, 2019
Grant date	Feb 5, 2019

Abstract

A method of forming monodispersed metal nanowires comprising: forming a reaction mixture including a metal salt, a capping agent and a ionic additive in a reducing solvent at a first temperature; and forming metal nanowires by reducing the metal salt in the reaction mixture.

First claim

The invention claimed is:

1. A method of forming monodispersed metal nanowires comprising:
forming a reaction mixture comprising a metal salt, a capping agent and an ionic additive in a reducing solvent, wherein a molar ratio of the ionic additive and the metal salt is between about 0.001 and about 0.1; and
allowing the reaction mixture to react in a sufficient period of time and at a sufficient temperature to reduce the metal salt to the monodispersed metal nanowires.

2. The method of claim 1 wherein the metal salt is silver nitrate, silver acetate, silver perchlorate, gold perchlorate, palladium chloride, or platinum chloride.

3. The method of claim 1 , wherein the ionic additive comprises an anion selected from the group consisting of chloride, iodide, fluoride, phosphate, sulfate, hydrogen sulfate, and sulfonate.

4. The method of claim 1 wherein the ionic additive is HCl, ZnCl 2 , or MgCl 2 .

5. The method of claim 1 , wherein the molar ratio of the ionic additive and the metal salt is about 0.1.

6. The method of claim 1 , wherein the capping agent is poly(vinyl pyrrolidone), polyacrylamide, polyacrylic or a copolymer thereof.

7. The method of claim 1 , wherein the capping agent is poly(vinyl pyrrolidone) having a molecular weight of 50,000.

8. The method of claim 1 , wherein the reducing solvent comprises at least two hydroxyl groups.

9. The method of claim 1 , wherein the reducing solvent is ethylene glycol, 1,2-propylene glycol, 1,3-propylene glycol, glycerin, glycerol, or glucose.

10. The method of claim 1 , wherein the reaction mixture is formed at a first temperature of about 20° C. to about 40° C.

11. The method of claim 1 , wherein the reducing is carried out at a second temperature of about 50° C. to about 170° C.

12. The method of claim 1 , wherein the metal salt is silver nitrate, and silver nanowires are formed.

13. The method of claim 12 , wherein the silver nanowires have a mean diameter of 75±8 nm, and an average length of 9.7±2.6 μm.

14. The method of claim 1 , wherein the reaction mixture comprises silver nitrate, poly(vinyl pyrrolidone), tetrabutylammonium chloride and ethylene glycol.

15. The method of claim 1 , wherein the monodispersed metal nanowires have aspect ratios of greater than 100.

16. The method of claim 1 , wherein the sufficient temperature is below 100° C.

Assignees

• Cam Holding Corp
• Cambrios Film Solutions Corp

Inventors

• Allemand Pierre-Mar

Classifications

• B22F1/0547

  Nanofibres or nanotubes · CPC title

• B22F9/24 Primary

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

• C30B7/14

  the crystallising materials being formed by chemical reactions in the solution · CPC title

• B22F2999/00

  Aspects linked to processes or compositions used in powder metallurgy · CPC title

• B22F2301/25

  Noble metals, i.e. Ag Au, Ir, Os, Pd, Pt, Rh, Ru · CPC title