原子非简谐振动对金属基外延石墨烯电导率的影响  

The Effect of Atom Anharmonic Vibration on the Conductivity of Metal Matrix Epitaxial Graphene

作　　者：龙晓霞[1] 申凤娟 LONG Xiao-xia SHEN Feng-juan(Engineering Research Center of New Energy Storage Devices and Applications for universities in Chongqing, Chongqing University of Arts and Sciences, Chongqing 402160, China)

机构地区：[1]重庆市高校新型储能器件及应用工程研究中心,重庆文理学院,重庆402160

出　　处：《西南大学学报（自然科学版）》2017年第9期118-124,共7页Journal of Southwest University(Natural Science Edition)

基　　金：重庆市基础与前沿研究项目(cstc2015jcyjA40054)

摘　　要：考虑到原子的非简谐振动和电子-声子相互作用,建立了金属基外延石墨烯的微观物理模型,用固体物理理论和方法,研究了外延石墨烯电导率随温度的变化规律,以Cu,Ni金属基底外延石墨烯为例,探讨了基底材料和原子的非简谐振动对电导率的影响.结果表明:(1)金属基外延石墨烯的电导率随温度升高而减小,其中,温度较低时时,变化较快,而温度较高时则变化很慢;它的电导率包括声子的贡献和电子的贡献两部分,其中电子的贡献部分很小,且随温度的变化也小,而声子的贡献远大于电子且随温度变化较大.(2)基底材料和原子的非简谐振动对金属基外延石墨烯的电导率有重要的影响:简谐近似下,电导率随温度的变化较小,考虑到非简谐振动,电导率随温度的变化增大.温度愈高,非简谐效应愈显著.理论结果与其他文献的值以及电学理论相近.Based on a review of the characteristics,preparation methods and applications of graphene materials in pervious studies,we intend to do some improvement over Russian scholar Z.Z.Alisultanov＇s design of the graphene conductivity measurement device.Considering the non-harmonic vibration and atomic electron-phonon interaction,with the theories and methods of the physics of solids,we plan to establish a metal matrix extension graphene micro-physical model and study the change of epitaxial graphene conductivity with temperature.With Cu-and Ni-based extension graphene as an example,we discuss the influence of the basal material and of non-harmonic vibration of the atoms on the conductivity.The electrical conductivity of the metal matrix extension of graphene decreases with increasing temperature,being relatively fast with lower temperature and rather slow with higher temperature.The contribution of electrons to conductivity is small,with little change with temperature,while that of photons is much greater,with considerably large change with temperature.The non-harmonic vibration of the basal material and the atoms has important effects on the metal matrix extension of graphene＇s electrical conductivity.With similar harmonic vibration,the change in conductivity with temperature is small.Considering the non-harmonic vibration,the conductivity and the anharmonic effect increase with increasing temperature.The results of this study are similar to the data in other documents and consistent with the electrical theory.

关 键 词：金属基外延石墨烯 电导率 温度变化规律 声子 非简谐效应 

分 类 号：TB34[一般工业技术—材料科学与工程]