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Method for judging number of layers of graphene oxide based on thermal enhanced optical contrast

An optical contrast and graphene technology, which is used in material analysis, scientific instruments, color/spectral property measurement and other directions by optical means, can solve problems such as inapplicability, and achieve the effect of low detection cost and low equipment requirements.

Inactive Publication Date: 2020-11-17
EAST CHINA UNIV OF TECH
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Problems solved by technology

However, the above-mentioned methods for characterizing graphene oxide materials are not suitable for rapid and large-scale sample layer detection.

Method used

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  • Method for judging number of layers of graphene oxide based on thermal enhanced optical contrast
  • Method for judging number of layers of graphene oxide based on thermal enhanced optical contrast
  • Method for judging number of layers of graphene oxide based on thermal enhanced optical contrast

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Embodiment Construction

[0022] In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further described below in conjunction with specific embodiments.

[0023] A method for determining the number of graphene oxide layers based on thermally enhanced optical contrast, the specific steps are as follows:

[0024] 1) Prepare the graphene oxide aqueous solution (2mg mL) required for sampling by the modified Hummers method -1 ), and then spin-coat the graphene oxide aqueous solution onto the pre-cleaned 285nm SiO 2 / Si substrate surface, SiO 2 / Si substrate is placed on the homogenizer, the speed of the homogenizer is set to 1000rpm, and the time is kept for 1min, so that the graphene oxide film dispersed in the graphene oxide aqueous solution is randomly adsorbed on the SiO 2 / Si substrate surface, dry naturally, obtain sample;

[0025] 2) Put the sample obtained in step 1) into a tube furnace (OTF-...

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Abstract

A method for judging the number of layers of graphene oxide based on thermal enhanced optical contrast comprises the steps that firstly, a graphene oxide solution is spin-coated, dripped or immersed on the surface of a pre-cleaned target substrate, natural drying is conducted, then the target substrate is put into a heating device, vacuumizing is conducted, the temperature is increased to the hightemperature, and each heating temperature is kept for a certain period of time; meanwhile, after each step of heat treatment is completed, an optical microscope is used for shooting an optical picture adsorbed with a graphene oxide film area in the same sample area on the surface of the target substrate, and R, G or B values of the graphene oxide film and the surface of the adjacent substrate inthe optical picture are collected through RGB reading software; the average value of the optical contrast of thermal enhancement of the graphene oxide film is obtained through an optical contrast formula, the number of layers of graphene oxide is simply, rapidly and accurately judged by utilizing the optical contrast close to complete recovery after thermal treatment of graphene oxide, and the method is low in equipment requirement, low in detection cost and capable of detecting a large number of samples at a time.

Description

technical field [0001] The invention relates to the technical field of material analysis and detection, in particular to a method for determining the number of graphene oxide layers based on thermally enhanced optical contrast. Background technique [0002] In 2004, the key factor for graphene to be discovered was that it would be exfoliated on 300nm SiO 2 / Si substrate composed of only one layer of carbon atoms is clearly visible when placed under an optical microscope. Subsequently, graphene has shown great application potential in many fields such as energy storage, sensing, flexible display and photoelectric detection due to a series of unique physical and chemical properties. There are two reasons for the visualization of graphene on this substrate: first, graphene itself has a universal absorption of visible light, with a single layer absorption rate of 2.3%; second, based on SiO 2 The interference effect of the / Si multilayer structure enhances its light absorption....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/25G01N21/17
CPCG01N21/25G01N21/1717G01N2021/1731
Inventor 郭喜涛倪振华
Owner EAST CHINA UNIV OF TECH
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