Physics 版 (精华区)
发信人: zjliu (秋天的萝卜), 信区: Physics
标 题: 钯纳米粒子中的无序和量子尺寸效应的抑制
发信站: 哈工大紫丁香 (Thu Jun 12 20:13:55 2003)
June 2003, to be published in Physical Review Letters
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Disorder and suppression of quantum confinement effects in Pd nanoparticles
J. G. Hou, Bing Wang, Jinlong Yang, Kedong Wang, Wei Lu, Zhenyu Li, Haiqian
Wang, D. M. Chen, and Qingshi Zhu
Size-selectable ligand-passivated crystalline and amorphous Pd
nanoparticles ($<4$ nm) are synthesized by a novel two-phase process and
verified by high resolution transmission electron microscopy. Scanning
tunneling spectroscopy preformed at 5 K on these two types of nanoparticles
supported on a gold substrate exhibits clear Coulomb blockade and Coulomb
staircases. Size dependant multi-peak spectral features in the differential
conductance curve are observed for the crystalline Pd particles but not for
the amorphous particles. Theoretical analysis shows that these spectral
features are related to the quantized electronic states in the crystalline
Pd particle. The suppression of quantum confinement effect in the amorphous
particle arises from both the static effect, the reduction of the
degeneracy of the eigenstates as a result of the structural disorder, and
the dynamic effect, the level broadening due to the reduced life time of
the electronic states, caused mainly by the enhanced electron-electron
interaction in a nanoparticle.
? 2003 The American Physical Society.
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