Experimental observation of quantum oscillation of surface chemical reactivities
Experimental observation of quantum oscillation of surface chemical reactivities
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DOI：
10.1073/pnas.0611024104
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发表时间：
2007-05
期刊：
影响因子：
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通讯作者：
Xucun Ma;Peng Jiang;Yun Qi;J. Jia;Y. Yang;W. Duan;Wei‐Xue Li;X. Bao;S. Zhang;Q. Xue
中科院分区：
文献类型：
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作者：
Xucun Ma;Peng Jiang;Yun Qi;J. Jia;Y. Yang;W. Duan;Wei‐Xue Li;X. Bao;S. Zhang;Q. Xue
在这里，我们用扫描隧道显微镜直接观察到超薄(2-6 nm)铅台面上O2的吸附量和表面氧化速率与膜厚度的函数关系的量子反应性。对电子结构的同时光谱测量揭示了一种起源于介观量子井态的量子振荡，这是受限电子波的Fabry-Pérot模的推广。我们预计量子反应性将是大多数超薄金属薄膜的普遍现象，具有广泛的意义，如表面反应性的纳米结构调节和多相催化剂的合理设计。
Here we present direct observation of a quantum reactivity with respect to the amounts of O2 adsorbed and the rates of surface oxidation as a function of film thickness on ultrathin (2–6 nm) Pb mesas by scanning tunneling microscopy. Simultaneous spectroscopic measurements on the electronic structures reveal a quantum oscillation that originates from quantum well states of the mesas, as a generalization of the Fabry–Pérot modes of confined electron waves. We expect the quantum reactivity to be a general phenomenon for most ultrathin metal films with broad implications, such as nanostructure tuning of surface reactivities and rational design of heterogeneous catalysts.