Structure and dynamics investigations of a partially hydrogenated graphene/Ni(111) surface
Structure and dynamics investigations of a partially hydrogenated graphene/Ni(111) surface
复制标题
DOI：
10.1016/j.carbon.2016.12.055
复制
发表时间：
2017-04-01
期刊：
影响因子：
10.9
通讯作者：
Fouquet, Peter
中科院分区：
文献类型：
--
作者：
Bahn, Emanuel;Tamtoegl, Anton;Fouquet, Peter
用氦(-3)原子散射研究了氢原子在单层石墨烯表面的吸附动力学、结构和扩散动力学。衍射测量表明，该晶体为4度旋转的矩形氢超结构。氢的吸附和脱附的活化势垒分别为E-a=(89+/-7)meV和E-d=(1.8+/-0.2)eV。氦(-3)自旋回波测量表明，在光谱仪的时间范围内，空间相关函数(或中间散射函数)没有衰减。因此，我们能够为可能的氢表面扩散速率设定下限。(C)2016爱思唯尔有限公司。保留所有权利。
Using helium(-3) atom scattering, we have studied the adsorption kinetics, the structure and the diffusional dynamics of atomic hydrogen on the surface of a graphene monolayer on Ni(111). Diffraction measurements reveal a 4 degrees rotated rectangular hydrogen overstructure. Hydrogen adsorption and desorption exhibit activation barriers of E-a = (89 +/- 7) meV and E-d = (1.8 +/- 0.2) eV, respectively. Helium(-3) spin-echo measurements showed no decay of the spatial correlation function (or intermediate scattering function) within the time range of the spectrometer. Hence, we are able to set lower limits for a possible hydrogen surface diffusion rate. (C) 2016 Elsevier Ltd. All rights reserved.