钻石
单层
材料科学
过渡金属
化学物理
碳化物
密度泛函理论
吸附
电子亲和性(数据页)
金属
电子
纳米技术
计算化学
物理化学
化学
冶金
分子
物理
量子力学
催化作用
有机化学
生物化学
作者
Amit K. Tiwari,Jonathan P. Goss,P.R. Briddon,N. G. Wright,Alton B. Horsfall,Mark Rayson
标识
DOI:10.1103/physrevb.86.155301
摘要
The presence of adsorbate species on diamond surfaces, even in small concentrations, strongly influences electrical, chemical, and structural properties. Despite the technological significance, coverage of diamond by transition metals has received relatively little attention. In this paper, we present the results of density functional calculations examining up to a monolayer of selected metals (Cu, Ni, Ti, and V) on the (001) diamond surface. We find that addition of carbide forming species (Ti and V) results in significantly higher adsorption energies at all surface coverages relative to those of the non-carbide-forming species. For monolayer coverage by Cu or Ni, and submonolayer coverage by Ti and V, we find large, negative electron affinities. We propose that based upon the electron affinities and binding energies, metal-terminated (001) diamond surfaces are promising candidates for electron emission device applications.
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