Epitaxial Growth of Ultrathin δ-Like ΜοΝ Films on Ru(0001)

被引:0
作者
Asim Khaniya
William E. Kaden
机构
[1] University of Central Florida,Department of Physics
[2] University of Central Florida,Renewable Energy and Chemical Transformations Cluster
来源
Topics in Catalysis | 2019年 / 62卷
关键词
Molybdenum-nitride; Thin-films; Epitaxy; Catalysis; Hydrotreatment;
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学科分类号
摘要
Growth of ultrathin, single-crystalline, molybdenum-nitride films on Ru(0001) has been investigated by means of X-ray photoelectron spectroscopy (XPS), low energy electron diffraction, and helium ion scattering spectroscopy. The films were prepared in a multistep, sequential process. First, samples were exposed to saturation doses of low kinetic energy nitrogen ions. Second, the samples were exposed to varied doses of molybdenum vapor. Finally, the samples were heated in the renewed presence of low kinetic energy nitrogen ions. Through this process, an annealing temperature of 700 K was found to result in well-ordered, hexagonal films that appear to initially grow layer-by-layer, and in registry with the Ru(0001) support. XPS-characterized chemical-states and relative integrated peak intensities for Mo 3d and N 1s photoelectrons are consistent with those expected for MoN nitride formation. Films annealed above T = 700 K in UHV decompose via a presumptive N2 recombinative desorption mechanism, which leaves the film in a purely metallic Mo–Ru configuration by T = 1100 K.
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页码:1035 / 1043
页数:8
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