The Study Of Raman Spectrum Of The Graphene

Graphene,which is a single atom thick material in a hexagonal lattice,exhibits enormous fascinating optical and electrical properties and has attracted many researchers in photonics and optoelectronics due to its particular band-structure.On the other hand,the graphene is very sensitive to the environment.For example,the contacting with molecules,metal electrodes,substrates and irradiation of electron beam could conspicuously change the properties of the graphene.To main contents are in details as follows:(1)The influence of gold nanoparticles(GNPs)on graphene was studied by Raman spectroscopy.It was found that the contact of GNPs could induce the whole Raman spectrum of graphene to redshift.And the shift of the 2D peak is more obvious than that of the G peak.A model of local strain was brought forward to explain the shift of Raman spectrum,which comes from the charges transfer between the GNPs and graphene.The observation of the Raman shifts helps us to gain more physical insights into the graphene-related systems.(2)Graphene characterization and device fabrication often require an extensive use of electron beam irradiation,which may result in damage and disordering of graphene.The influence of electron-beam irradiation on single layer(SLG)and bilayer graphene(BLG)was studied by Raman spectroscopy.It was found that the influence of electron beam irradiation on the BLG is less the SLG.Namely,the SP2carbon-carbon bonds of the BLG is relatively more stable than that of the SLG under the e-beam irradiation.And a model that the increase of interaction along the third dimension can stabilize the quasi-two dimensional graphene was proposed to explain this stability of BLG.Moreover,this conclusion was further demonstrated experimentally by the other two experiments.This work is important for the relevant application and device fabrication of graphene,particularly,adds extra motivation for the BLG device applications.