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Method for realizing synchronous characterization of mechanical properties of graphene based on fold formation principle

A technology of graphene and graphene layers, which is applied in the field of graphene, can solve the problems of evaluation and inability to adapt to the elastic modulus of graphene, etc., and achieve the effects of reducing experimental errors, cost reduction, and strong adaptability

Inactive Publication Date: 2018-01-19
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

However, Raman spectroscopy cannot directly measure the elastic modulus of graphene. It needs to be measured indirectly by designing a more complex structure, and cannot adapt to the evaluation of the elastic modulus of graphene prepared by different processes.

Method used

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  • Method for realizing synchronous characterization of mechanical properties of graphene based on fold formation principle
  • Method for realizing synchronous characterization of mechanical properties of graphene based on fold formation principle
  • Method for realizing synchronous characterization of mechanical properties of graphene based on fold formation principle

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Experimental program
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Embodiment Construction

[0025] Such as figure 1 As shown, this embodiment includes the following steps:

[0026] ① First, high-quality single-layer graphene 4 is deposited on the copper foil 3 by CVD method, and then the PMMA layer 5 as a commonly used carrier material is spin-coated on the graphene layer 4 .

[0027] ②For a 2μm deep well, a PMMA solution with a concentration of 120mg / mL was spin-coated onto graphene / copper foil at a spin-coating speed of 4000rpm for 30 seconds, and dried in air; for a deep well of 300nm, a PMMA solution with a concentration of 120mg / mL, Spin coating speed 1000rpm, 30 seconds.

[0028] ③ Use PDMS block 6 as an elastic frame support to naturally adsorb on the combined film of PMMA layer 5 / graphene 4, so that the film can be removed from the etchant and placed on the target substrate 7 or test substrate 8 .

[0029] ④Substrate heating exceeds T g (125° C.), heat treatment at 150° C. for 12 hours enables the undulating and rough PMMA layer 5 / graphene 4 combination fi...

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Abstract

Provided is a method for realizing synchronous characterization of the mechanical properties of graphene based on the fold formation principle. Two identical PMMA / graphene composite films are made. The graphene in the composite films is placed on a test substrate and on a target substrate respectively through technologies such as a dry graphene transfer technology. After cooling treatment under the same conditions, folds are generated due to stress mismatch because the thermal expansion confidents of the test substrate and the target substrate are different from that of graphene. Finally, themechanical properties of graphene are evaluated by measuring the wavelength and amplitude of graphene folds. The method can be carried out synchronously with a graphene process, and thus, the elasticmodulus, surface stress, number of layers and other mechanical properties of graphite can be characterized simply and quickly.

Description

technical field [0001] The present invention relates to a technique in the field of graphene, specifically a method for synchronously characterizing the mechanical properties of graphene based on the principle of wrinkle formation, which is characterized in that it can simultaneously characterize graphene during the preparation process of graphene Important mechanical performance parameters such as elastic modulus, residual stress and number of layers. Background technique [0002] At present, the experimental testing of the mechanical properties of graphene mainly uses the nano-indentation system and nano-scratch system of the atomic force microscope (AFM) to obtain the basic mechanical properties of graphene, and indirectly analyzes graphene through the Raman spectrum test of graphene. mechanical properties. However, the nanoindentation experiment is very discrete. The size and position of the indenter, as well as the shape and loading rate of the graphene itself will hav...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L5/00G01N33/00G01B21/08
Inventor 胡开明张文明闫寒
Owner SHANGHAI JIAO TONG UNIV
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