Abstract

Samples of rhodium nanoparticles supported on the surface of highly oriented pyrolytic graphite (HOPG) are prepared by vacuum deposition; their interaction with nitrogen dioxide is studied by X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM). In the initial state, metallic rhodium particles with a size of about 2–5 nm are combined into aggregates localized on the steps and terraces, apparently, in the region of localization of structural defects. After treatment in NO₂ at room temperature and pressures of 10⁻⁶ and 10⁻⁵ mbar, carbon oxidation accompanied by the degradation of the structure of 12–15 graphene layers on the HOPG surface is observed. Under these conditions, rhodium remains in the metallic state, and the Rh particles are encapsulated with carbon. The results are compared with data on the interaction of NO₂ with Pt and Pd nanoparticles supported on the HOPG surface.

中文翻译：

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二氧化氮与负载在高取向热解石墨 (HOPG) 表面上的铑纳米颗粒的室温相互作用

摘要

通过真空沉积制备负载在高度取向热解石墨（HOPG）表面上的铑纳米颗粒样品；通过 X 射线光电子能谱 (XPS) 和扫描电子显微镜 (SEM) 研究它们与二氧化氮的相互作用。在初始状态，尺寸约为 2-5 nm 的金属铑颗粒结合成聚集体，聚集体位于台阶和平台上，显然，位于结构缺陷的定位区域。在室温和 10 ^-6和 10 ^-5压力下在 NO ₂中处理后mbar，观察到碳氧化伴随着 HOPG 表面上 12-15 个石墨烯层结构的降解。在这些条件下，铑保持金属状态，而 Rh 颗粒被碳包裹。将结果与 NO ₂与负载在 HOPG 表面上的 Pt 和 Pd 纳米颗粒相互作用的数据进行比较。