Graphene in-plane bidirectional strain detection method and device

Abstract

The invention provides a graphene in-plane bidirectional strain detection method and device. The method comprises the following steps of acquiring a detected graphene sample and a back scattering polarization raman system; setting a sample coordinate system of the detected graphene sample under the back scattering polarization raman system; obtaining the crystal orientation angle, the main strainangle, the phonon variation coefficient and the strain-free G-peak raman frequency shift of the detected graphene sample; setting an incident light polarization angle and a scattered light polarization angle; setting a detected point of the detected graphene sample; adopting the back scattering polarization raman system, regulating and controlling the incident light polarization angle and the scattered light polarization angle so as to obtain the G-peak raman frequency shift increment of the detected point; and according to the linear relation between the G-peak raman frequency shift incrementand the first main strain and between the G-peak raman frequency shift increment and the second main strain, the incident light polarization angle, the scattered light polarization angle, the phononvariation coefficient, the strain-free G-peak raman frequency shift and the G-peak raman frequency shift increment of the detected point, obtaining the first main strain and the second main strain, sothat the nondestructive and accurate measurement of the graphene sample in-plane bidirectional strain is realized.

Description

technical field [0001] The invention relates to the technical field of mechanical measurement, in particular to a graphene in-plane bidirectional strain detection method and device. Background technique [0002] In recent years, with the development of micro- and nano-scale science and technology, research on the performance of materials and devices at the micro- and nano-scale has become a frontier field of common concern among multiple disciplines. As a two-dimensional nanomaterial, graphene has excellent optical, electrical, and mechanical properties, and has important application prospects in materials science, micro-nano processing, and energy. Its application has important influence. Therefore, it is an urgent need for the development of this field to carry out research on new technologies and new methods for the non-destructive testing and characterization of graphene-related mechanical parameters at the micro- and nano-scales, so as to accurately grasp its strain st...

AI Technical Summary

Problems solved by technology

However, for graphene samples in a biaxial strain state, the existing Raman strain measurement technology cannot realize the decoupling measurement of the in-plane non-equal biaxial and biaxial strain, so that the accurate strain state and level cannot be reflected.

In addition, the graphene-based strain sensing technology is currently unable to realize the decoupling analysis of the non-equal biaxial strain in the flexible substrate material and the structural plane, which is difficult to meet the needs of engineering.

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