Unlock instant, AI-driven research and patent intelligence for your innovation.

Preparation method of ultrathin flexible graphene film

A technology of graphene film and flexible graphite, which is applied in the direction of graphene, chemical instruments and methods, nano-carbon, etc., can solve the problems of low production efficiency, limit the commercial application of graphene film, and high cost, and achieve excellent mechanical properties, good Flexible, low-cost effect

Pending Publication Date: 2022-07-05
SHANDONG UNIV
View PDF6 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although there are many reports and applications of existing preparation methods, there are problems such as low preparation efficiency and high cost, which limit the wider commercial application of graphene films.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Preparation method of ultrathin flexible graphene film
  • Preparation method of ultrathin flexible graphene film
  • Preparation method of ultrathin flexible graphene film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A preparation method of an ultra-thin flexible graphene film, comprising the following steps:

[0030] (1) preparation of graphene oxide: add vitriol oil in the beaker, add graphite, sodium nitrate and potassium permanganate successively under stirring, control the reaction temperature in sections, add hydrogen peroxide solution at last to terminate the reaction, after precipitation, washing , to obtain graphene oxide;

[0031] In the present embodiment, a certain volume of concentrated sulfuric acid is measured into a beaker, cooled to below 4°C, and under stirring, expanded graphite and sodium nitrate are added, and after stirring evenly, potassium permanganate is added, and the temperature is controlled at 0-5 ℃, the reaction time lasts for 1h, which is the low temperature reaction stage; specifically, the amount of concentrated sulfuric acid is 200mL, the mass of graphite is 5g, the mass of sodium nitrate is 3.75g, and the mass of potassium permanganate is 15g.

[...

Embodiment 2

[0040] According to the preparation method of a kind of ultra-thin flexible graphene film provided in embodiment 1, the difference is:

[0041] In step (3), pour the liquid nitrogen from the edge of the metal mold onto the metal mold several times, and after the liquid nitrogen has evaporated, pour new liquid nitrogen until the film is detached from the substrate, and pour the liquid nitrogen each time. The volume is about 8-12mL. In order to prevent the liquid nitrogen from volatilizing too violently, the graphene film will be broken.

Embodiment 3

[0043] According to the preparation method of a kind of ultra-thin flexible graphene film provided in embodiment 1, the difference is:

[0044] In step (3), the material of the metal mold is zinc.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
thicknessaaaaaaaaaa
Login to View More

Abstract

The invention relates to a preparation method of an ultrathin flexible graphene film, which comprises the following steps: taking graphite as a raw material, carrying out oxidation and ultrasonic treatment to obtain a graphene oxide dispersion liquid, then putting the graphene oxide dispersion liquid into a metal mold, and drying to form a film, thereby obtaining the ultrathin flexible graphene film. The ultra-thin graphene film with good flexibility can be obtained by demolding by utilizing a great difference of thermal expansion coefficients of graphene and a metal material at an ultra-low temperature (-195 DEG C) and a bubbling process of liquid nitrogen at room temperature, and finally performing high-temperature annealing, and can be applied to the fields of heat dissipation film materials, flexible electronic products and the like. According to the method for preparing the graphene film, the thickness of the graphene film can be in the order of magnitude of several microns, and the method is simple in operation, low in cost, high in operability and good in repeatability.

Description

technical field [0001] The invention relates to a preparation method of an ultra-thin flexible graphene film, belonging to the technical field of graphene film materials. Background technique [0002] Graphene is composed of a single layer of sp 2 The hexagonal lattice honeycomb-like two-dimensional structure composed of hybrid carbon atoms, its unique stable structure makes it have excellent properties different from other materials. Graphene is a zero-bandgap semiconductor material with ultra-high carrier mobility, which is 140 times that of commercial silicon materials, reaching 200,000 cm 2 / V s, higher than any known semiconductor material. In addition, graphene also has ultra-high electrical conductivity, Young's modulus, fracture strength, and thermal conductivity as high as 5300W m -1 ·K -1 , is the material with the highest known thermal conductivity. The excellent properties of graphene make it have great application potential in many aspects. The preparation...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/184C01B32/198
CPCC01B32/184C01B32/198Y02E60/13
Inventor 李虎郑晓晓
Owner SHANDONG UNIV