期刊
SURFACE SCIENCE
卷 604, 期 11-12, 页码 988-995出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.susc.2010.03.002
关键词
Low-energy electron diffraction (LEED); Low-energy ion scattering (LEIS); Rutherford backscattering spectroscopy (RBS); Shadow cone; Sodium alanate; Density Funtional Theory (DFT); Al; Ti
资金
- National Science Foundation [DMR 0516603]
The atomic structure of sub-monolayer amounts of Ti deposited on the Al(001) surface at room temperature has been investigated using low-energy electron diffraction (LEED) and low-energy ion scattering spectroscopy (LEIS). The Ti coverage was determined using Rutherford backscattering spectroscopy (RBS). Though a crisp LEED image is inherently difficult to obtain, the symmetry of the observed c(2 x 2) LEED images allows us to infer a structure which places Ti atoms in every other Al lattice site. Analysis of the LEIS azimuth- and polar-angle scan spectra has been done to determine the best structural model which supports the c(2 x 2) symmetry of the LEED image as well as LEIS experimental data. It was concluded that the best model consistent with the experimental data, puts Ti preferentially below the surface of the Al substrate at every other lattice site for sub-monolayer coverage of Ti on Al(001). As Ti coverage increases, the presence if Ti atoms in the surface layer also increases. Results of this study are relevant to research pertaining to the possible use of Ti as a catalyst in sodium alanate (NaAlH(4)) in hydrogen storage applications. (C) 2010 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据