Applications of Raman spectroscopy in graphene-based polymer nanocomposites
HAO Si-jia1,2, LI Zhe-ling3, REN Zhi-dong1,2, TIAN Jun-peng1,2, SHI Shuang-qiang1,2, XING Yue1,2, YANG Cheng1,2
1. Research Center of Graphene Applications, AECC Beijing Institute of Aeronautical Materials, Beijing 100095, China;
2. Beijing Institute of Graphene Technology Co., Ltd., Beijing 100094, China;
3. National Graphene Institute, University of Manchester, Manchester M13 9PL, UK
Abstract：Raman spectroscopy is well-known for its capability of detecting the physical properties, level of defects and number of layers for graphene-based materials, but far more than that, it's proven to be a versatile and promising tool for characterizing graphene-based polymer composites. This work focuses on the applications of Raman spectroscopy in the field of graphene-based polymer composites. The feature bands in Raman spectroscopy enable direct 2D and 3D imaging of graphene-based nanofillers in the polymer matrix, and even out of other carbonaceous materials. In addition, shifts in the vibrational frequencies of the characteristic bands induced by the strain of graphene could be utilized for analyzing the interactions between graphene-based nanofillers and polymer molecules, for calculating the effective moduli as well as for determining the spatial orientation of graphene-based nanofillers in the matrix. In the meantime, the recent progress of applications of Raman spectroscopy in the field of graphene-based polymer composites is introduced, such as the analysis of micromechanics of graphene-based nanocomposites, the investigation of stress transfer efficiency between the nanofillers and the matrix, and the reveal of key factors affecting material behavior. The Raman spectroscopy researches of graphene-based polymer composites currently are mainly focused on model composites, and the fluorescent effect of the matrix polymer as well limits the further applications of Raman spectroscopy. In order to address such problem, the amplified razor power are often adopted, and the resulted nonlinear effects are capable of increasing the intensity of the Raman signal, thus the Raman spectroscopy will be more widely applied in the field of graphene-based polymer composites.
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