拉曼光谱在石墨烯聚合物纳米复合材料中的应用

拉曼光谱不仅能够用于确定石墨烯的物理性质、缺陷程度及层数等,也逐渐发展成为研究石墨烯聚合物复合材料重要的分析表征工具。石墨烯拉曼特征峰可用于对复合材料中石墨烯进行二维及三维的拉曼成像,从而获得石墨烯的分散状态。石墨烯拉曼特征峰的位移能够灵敏地反映石墨烯的形变程度,从而定量地评估复合材料中石墨烯与聚合物分子之间的相互作用、计算石墨烯的有效杨氏模量以及确定石墨烯的空间取向。本文综述了拉曼光谱在石墨烯聚合物复合材料领域的应用研究,介绍了拉曼光谱技术在石墨烯聚合物复合材料领域的最新研究进展,如石墨烯复合材料的微观变形机理、石墨烯与聚合物基体之间的应力转移效率、影响材料性能的关键性因素等。石墨烯聚合物复合材料的拉曼光谱研究目前仍以模型化复合材料为主要研究对象,而且聚合物基体的荧光效应也会在一定程度上限制拉曼光谱的应用。针对于此,可适当提高激发光的功率而产生一些非线性效应,以大幅增大拉曼光强度,从而使拉曼光谱技术在石墨烯聚合物复合材料领域中得到更广泛的应用。

Applications of Raman spectroscopy ingraphene-based polymer nanocomposites

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.