# US 8,541,098 B2 · Purification of metal nanostructures for improved haze in transparent conductors made from the same

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- Number: US 8,541,098 B2
- Document ID: US8541098B2
- Status: Granted
- Kind: B2
- Application number: 12/862,664
- Filed: 2010-08-24
- Published: 2011-02-24
- Granted: 2013-09-24
- Earliest claimed: 2009-08-24
- Assignees: Cambrios Technology Corporation
- Applicants: Pierre-Marc Allemand
- Inventors: Pierre-Marc Allemand
- Web page: https://patentgrep.com/patent/US8541098B2

## CPC

- C09D 5/24: Electrically-conducting paints {(conductive materials H01B1/00)}
- B22F 1/00: Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F 1/0547: {Nanofibres or nanotubes}
- B22F 9/16: using chemical processes
- B82Y 30/00: Nanotechnology for materials or surface science, e.g. nanocomposites
- B82Y 40/00: Manufacture or treatment of nanostructures
- C09D 11/52: Electrically conductive inks
- B22F 2301/255: Silver or gold
- Y10T 428/249924: Noninterengaged fiber-containing paper-free web or sheet which is not of specified porosity
- Y10T 428/25: Web or sheet containing structurally defined element or component and including a second component containing structurally defined particles
- C09D: COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR (cosmetics A61K; processes for applying liquids or other fluent materials to surfaces, in general, B05D; staining wood B27K5/02; glazes or vitreous enamels C03C; natural resins, French polish, drying-oils, driers, turpentine, per se, C09F; polishing compositions other than French polish, ski waxes C09G; adhesives or use of materials as adhesives C09J; materials for sealing or packing joints or covers C09K3/10; materials for stopping leaks C09K3/12; processes for the electrolytic or electrophoretic production of coatings C25D)
- B22F: WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER (making alloys by powder metallurgy C22C); APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B82Y: SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

Provided are a method of isolating and purifying metal nanowires from a crude and complex reaction mixture that includes relatively high aspect ratio nanostructures as well as nanostructures of low aspect ratio shapes, and conductive films made of the purified nanostructures.

## Claims

### Claim 1

A conductive film comprising:
a conductive network of a plurality of silver nanowires that has a resistance of at least 200 ohm/sq; and
no more than 1500 nanostructures having an aspect ratio of less than 10 per millimeter square area of the conductive film.

### Claim 2 (depends on 1)

The conductive film of claim 1, wherein the conductive film has a haze of no more than 0.5%.

### Claim 3 (depends on 1)

The conductive film of claim 1 wherein the conductive film has a resistance of at least 600 ohm/sq; and no more than 500 nanostructures having an aspect ratio of less than 10 per millimeter square area of the conductive film.

### Claim 4 (depends on 3)

The conductive film of claim 3 wherein the conductive film has a haze of no more than 0.25%.

### Claim 5 (depends on 1)

The conductive film of claim 1 further comprising a viscosity modifier.

### Claim 6 (depends on 5)

The conductive film of claim 5 wherein the viscosity modifier and the silver nanowires are in a w/w ratio of 10 to 0.1.

### Claim 7 (depends on 1)

The conductive film of claim 1 wherein the viscosity modifier is hydroxypropyl methylcellulose (HPMC).