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Size-selected Au clusters deposited on SiO_2/Si: Stability of clusters under ambient pressure and elevated temperatures

机译:尺寸选择的金团簇沉积在SiO_2 / Si上:团簇在环境压力和高温下的稳定性

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摘要

This study examined the oxidation and reduction behavior of mass-selected Au clusters consisting of 2-13 atoms deposited on silica. An atomic oxygen environment was used for the oxidation of Au. X-ray photoelectron spectroscopy (XPS) was used to identify Au(III) and Au(O). Au_5, Au_7 and Au_(13) clusters deposited on the as-prepared SiO_2/Si substrates were highly inert towards oxidation, whereas the other clusters could be oxidized, i.e. the chemical property drastically changed with the number of atoms in a cluster. The size-selectivity in chemical reactivity remained unchanged upon air-exposure. The chemical properties of the deposited Au clusters were unchanged after annealing at 250 ℃. Annealing at higher temperatures caused structural changes to the surface, as determined by the oxidation behavior. XPS of the deposited Au clusters upon annealing indicated charge transfer from Au to silica.
机译:这项研究检查了由2-13个原子沉积在二氧化硅上的质量选择的金簇的氧化和还原行为。原子氧环境用于金的氧化。 X射线光电子能谱(XPS)用于鉴定Au(III)和Au(O)。沉积在制备好的SiO_2 / Si衬底上的Au_5,Au_7和Au_(13)团簇对氧化具有高度惰性,而其他簇可以被氧化,即化学性质随簇中原子的数量而急剧变化。空气暴露后,化学反应的尺寸选择性保持不变。 250℃退火后,沉积的金团簇的化学性质没有变化。高温退火导致表面结构发生变化,这取决于氧化行为。退火后沉积的金簇的XPS表明电荷从金转移到二氧化硅。

著录项

  • 来源
    《Applied Surface Science》 |2009年第4期|1148-1151|共4页
  • 作者单位

    Department of Surface Technology, Korea Institute of Materials Science, Changwon 641-010, Republic of Korea;

    Department of Physics, University of Konstanz, D-78457 Konstanz, Germany;

    Department of Physics, University of Konstanz, D-78457 Konstanz, Germany;

    Department of Chemistry, Sungkyunkwan University, 440-746 Cheoncheon-dong, Jangan-gu, Suwon, Cyeonggi-do, Republic of Korea;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Au; SiO_2; mass-selected clusters; oxidation;

    机译:金;SiO_2;大量选择的集群;氧化;

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