石墨烯边缘水吸附的研究。
Study of water adsorption on graphene edges.
作者信息
Jiang Lijuan, Wang Jinlong, Liu Peng, Song Wei, He Bingling
机构信息
Department of Physics and Electronic Engineering, Xinxiang University Xinxiang 453003 China.
State Key Laboratory of Low-Dimensional Quantum Physics, Department of Physics, Tsinghua-Foxconn Nanotechnology Research Center, Tsinghua University Beijing 100084 China
出版信息
RSC Adv. 2018 Mar 21;8(20):11216-11221. doi: 10.1039/c8ra00002f. eCollection 2018 Mar 16.
Water adsorption on graphene edges was studied by field emission (FE) experiments and first principles simulation. By analyzing the FE current change with temperature, it was concluded that the intrinsic FE of a graphene edge is consistent with Fowler-Nordheim (FN) theory. The noise of and non-linearity of FN curves at room-temperature can be interpreted by the adsorption effects. Water is speculated as the most responsible gas specie. We have calculated the work function of graphene by VASP. The results show that water adsorption will lower the work function of the graphene edge, while increasing the work function of the graphene surface.
通过场发射（FE）实验和第一性原理模拟研究了石墨烯边缘的水吸附。通过分析场发射电流随温度的变化，得出石墨烯边缘的本征场发射与福勒-诺德海姆（FN）理论一致。室温下FN曲线的噪声和非线性可以用吸附效应来解释。推测水是最主要的气体种类。我们用VASP计算了石墨烯的功函数。结果表明，水吸附会降低石墨烯边缘的功函数，同时增加石墨烯表面的功函数。
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