石墨烯透明导电薄膜电阻的环境稳定性研究

Research on Environmental Stability of Graphene Transparent Conductive Film Resistance

将石墨烯薄膜置于不同环境气氛中,探究其在不同波长和功率密度可见光辐照下的导电特性.结果表明,石墨烯薄膜在不同条件光照下电阻缓慢上升,光照停止后电阻缓慢下降.氮气环境下石墨烯导电性能最稳定,真空下变化最大,在相同功率密度红光辐照下,样品在氮气、大气和真空下相对电阻变化分别为0.09%、0.22%、0.4%.相同环境下,波长越短,光子能量越大,对样品影响越大,在大气环境下,相同功率密度的蓝光、绿光和红光对样品相对电阻的影响分别为20%、3%、0.22%.

In order to study the stability of graphene transparent conductive film under light irradiation and the mechanism of its stability change,the electrical conductivity of graphene under different atmosphere,wavelength and power density of visible light irradiation were introduced.Results show that resistance of graphene film increase slowly under irradiation,and decrease after light off.The resistance of graphene film is most stable under nitrogen,and most unstable under vacuum.Under the irradiation of red light with the same power density,the relative resistance changes of samples under nitrogen,air and vacuum is 0.09% ,0.22% and 0.4% respectively.In the same environment,the shorter the wavelength,the higher the photon energy of the light source has the greater impact on the samples.In the atmosphere,with the same power density,the relative resistance of the sample changes 20% under blue light,compared to 3% for green and 0.22% for red.