# US 2019/0172601 A1 · Thin and uniform silver nanowires, method of synthesis and transparent conductive films formed from the nanowires

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- Number: US 2019/0172601 A1
- Document ID: US20190172601A1
- Status: Published application
- Kind: A1
- Application number: 16/249,241
- Filed: 2019-01-16
- Published: 2019-06-06
- Earliest claimed: 2017-12-06
- Assignees: C3Nano Inc.
- Applicants: C3Nano Inc.
- Inventors: Yongxing Hu; Ying-Syi Li; Xiqiang Yang; Jing Shun Ang; Ajay Virkar
- Web page: https://patentgrep.com/patent/US20190172601A1

## CPC

- H01B 1/02: mainly consisting of metals or alloys
- H01B 1/22: the conductive material comprising metals or alloys
- H01B 5/00: Non-insulated conductors or conductive bodies characterised by their form
- H01B 13/0006: {for reducing the size of conductors or cables}
- H01B 13/0016: {for heat treatment}
- B82Y 30/00: Nanotechnology for materials or surface science, e.g. nanocomposites
- B82Y 35/00: Methods or apparatus for measurement or analysis of nanostructures
- B82Y 40/00: Manufacture or treatment of nanostructures
- H05K 2201/026: Nanotubes or nanowires
- H01B: CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES (selection for magnetic properties H01F1/00; waveguides H01P {; printed circuits H05K})
- B82Y: SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS

## Abstract

Highly uniform and thin silver nanowires are described having average diameters below 20 nm and a small standard deviation of the diameters. The silver nanowires have a high aspect ratio. The silver nanowires can be characterized by a small number of nanowires having a diameter greater than 18 nm as well as with a blue shifted narrow absorption spectrum in a dilute solution. Methods are described to allow for the synthesis of the narrow uniform silver nanowires. Transparent conductive films formed from the thin, uniform silver nanowires can have very low levels of haze and low values of ΔL*, the diffusive luminosity, such that the transparent conductive films can provide little alteration of the appearance of a black background.

## Claims

### Claim 1

A collection of nanowires comprising silver and having an average diameter of no more than about 20 nm and a standard deviation of the diameter of no more than about 2.5 nm.

### Claim 2 (depends on 1)

The collection of nanowires of claim 1 having an average diameter of no more than about 18 nm.

### Claim 3 (depends on 1)

The collection of nanowires of claim 1 having an average diameter of no more than about 16 nm.

### Claim 4 (depends on 1)

The collection of nanowires of claim 1 having a standard deviation of the diameter of no more than about 2.25 nm.

### Claim 5 (depends on 1)

The collection of nanowires of claim 1 having a standard deviation of the diameter of no more than about 2.0 nm.

### Claim 6 (depends on 1)

The collection of nanowires of claim 1 wherein a dilute dispersion of the nanowires in DMSO has a wavelength of maximum absorption of no higher than 376.5 nm, a normalized absorption at 410 nm of no more than about 0.225.

### Claim 7 (depends on 1)

The collection of nanowires of claim 1 wherein a dilute dispersion of the nanowires in DMSO has an absorption at 410 nm of no more than about 0.18 when the spectrum between 300 nm and 800 nm is normalized to have absorbance values between 0 and 1.

### Claim 8 (depends on 1)

The collection of nanowires of claim 1 wherein no more than 25% of the nanowires have a diameter greater than 18 nm

### Claim 9 (depends on 1)

The collection of nanowires of claim 1 wherein no more than about 10% of the nanowires have a diameter greater than 18 nm.

### Claim 10 (depends on 1)

The collection of nanowires of claim 1 having a noble metal coating.