Ultrasonic spray coating of conducting and transparent films from combined graphene and conductive nano filaments

A conductive nanometer and ultrasonic spraying technology, applied to conductive materials dispersed in non-conductive inorganic materials, spraying devices with movable outlets, coatings, etc., can solve problems such as reduction

Active Publication Date: 2016-04-13
NANOTEK INSTR +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Surprisingly, this method inherently reduces the contact resistance between metal nanowires (such as Ag or Cu nanowires) and between metal nanowires and graphene materials.

Method used

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  • Ultrasonic spray coating of conducting and transparent films from combined graphene and conductive nano filaments
  • Ultrasonic spray coating of conducting and transparent films from combined graphene and conductive nano filaments
  • Ultrasonic spray coating of conducting and transparent films from combined graphene and conductive nano filaments

Examples

Experimental program
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Effect test

Embodiment 1

[0098] Example 1: Production of native graphene by direct sonication of natural graphite in a low surface tension medium

[0099] As an example, five grams of natural graphite ground to a size of about 20 μm or less was dispersed in 1000 mL of n-heptane to form a graphite suspension. The sonicator tip was then immersed in the suspension, which was maintained at a temperature of 0-5°C during the subsequent sonication. An ultrasonic energy level of 200 W (Branson S450 ultrasonic generator) was used for exfoliation and separation of graphene planes from dispersed graphite particles for a period of 1.5 hours. The average thickness of the produced native graphene sheets was 1.1 nm, with mainly single-layer graphene and some few-layer graphene.

Embodiment 2

[0100] Example 2: Preparation of native graphene from natural graphite in water-surfactant medium using direct sonication

[0101] As another example, five grams of graphite flakes ground to a size of about 20 μm or less were dispersed in 1000 mL of deionized water (containing 0.15% by weight of dispersant, FSO, obtained from DuPont) to obtain a suspension. An ultrasonic energy level of 175 W (Branson S450 ultrasonic generator) was used for exfoliation, separation and size reduction for a period of 1.5 hours. This process was repeated several times, each time using five grams of starting graphite powder, in order to produce sufficient quantities of native graphene for film deposition.

Embodiment 3

[0102] Embodiment 3: use supercritical fluid to prepare native graphene

[0103] A natural graphite sample (approximately 5 grams) was placed in a 100 ml high pressure vessel. The container is equipped with safety clips and rings which isolate the interior of the container from the atmosphere. The vessel is in fluid communication with high pressure carbon dioxide through plumbing and restricted by a valve. A heating jacket is placed around the vessel to achieve and maintain the critical temperature of carbon dioxide. High pressure carbon dioxide is introduced into the vessel and maintained at about 1100 psig (7.58 MPa). Subsequently, the vessel was heated to about 70°C, at which temperature supercritical conditions of carbon dioxide were achieved and maintained for about 3 hours, allowing the carbon dioxide to diffuse into the inter-graphene spaces. Immediately thereafter, the vessel was "suddenly" depressurized at a rate of about 3 ml / sec. This is achieved by opening the ...

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Abstract

An ultrasonic spray coating method of producing a transparent and conductive film, comprising (a) operating an ultrasonic spray device to form aerosol droplets of a first dispersion comprising a first conducting nano filaments in a first liquid; (b) forming aerosol droplets of a second dispersion comprising a graphene material in a second liquid; (c) depositing the aerosol droplets of a first dispersion and the aerosol droplets of a second dispersion onto a supporting substrate; and (d) removing the first liquid and the second liquid from the droplets to form the film, which is composed of the first conducting nano filaments and the graphene material having a nano filament-to-graphene weight ratio of from 1 / 99 to 99 / 1, wherein the film exhibits an optical transparence no less than 80% and sheet resistance no higher than 300 ohm / square.

Description

field of invention [0001] The present invention relates generally to the field of transparent conducting electrodes for solar cells, photodetectors, light emitting diodes, touch screen and display device applications, and more particularly to electrodes having excellent optical transparency and high conductivity (or low thin layer Resistance) combined graphene / nanofilament-based hybrid films. Background of the invention [0002] The following references relate to the field of "Transparent and Conductive Electrodes": [0003] 1. L. Hu, D.S. Hecht and G. Gruner, “Percolation in Transparent and Conducting Carbon Nanotube Networks,” Nano Letters, 2004, 4, 2513–2517. [0004] 2. Z.Wu et al. "Transparent, ConductiveCarbon Nanotube Films," Science 27 August 2004: Vol.305no.5688, pp.1273-1276. [0005] 3. H.G. Park et al. "Transparent Conductive Single Wall Carbon Nanotube Network Films for Liquid Crystal Displays, ECS Solid State Lett. 2 October 2012: R31-R33. [0006] 4. Jung-Y...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B05D1/08B05B3/04
CPCB22F7/04C22C26/00B22F2007/042H01B1/22H01L31/1884Y02E10/549B22F1/0547H10K30/821H10K71/12
Inventor 林怡君阿茹娜·扎姆张博增李晓燕林瑞基
Owner NANOTEK INSTR
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