Molecular surface chemistry by metal single crystals and nanoparticles from vacuum to high pressure.
Molecular surface chemistry by metal single crystals and nanoparticles from vacuum to high pressure.
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DOI：
10.1039/b719148k
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发表时间：
2008-09
影响因子：
46.2
通讯作者：
G. Somorjai;Jeong Y. Park
中科院分区：
文献类型：
--
作者：
G. Somorjai;Jeong Y. Park
用于研究分子表面化学的模型系统已经从低压下的单晶表面发展到高压下的胶体纳米颗粒。利用分子束表面散射和低能电子衍射技术研究铂单晶的低压表面结构，探测解离反应（H-H, C-H, C-C， O=O键）表面缺陷、步骤和扭结的独特活性。利用和频产生振动光谱对铂单晶进行高压研究，揭示了反应中间体的存在及其性质。铂单晶表面的高压扫描隧道显微镜显示了催化反应过程中吸附物的迁移性。纳米粒子系统用于确定金属-氧化物界面的作用，位点阻塞和表面结构在反应表面化学中的作用。纳米颗粒的大小、形状和组成在决定反应活性和选择性方面起着重要作用，并在本教程综述中进行了介绍。
Model systems for studying molecular surface chemistry have evolved from single crystal surfaces at low pressure to colloidal nanoparticles at high pressure. Low pressure surface structure studies of platinum single crystals using molecular beam surface scattering and low energy electron diffraction techniques probe the unique activity of defects, steps and kinks at the surface for dissociation reactions (H-H, C-H, C-C, O=O bonds). High-pressure investigations of platinum single crystals using sum frequency generation vibrational spectroscopy have revealed the presence and the nature of reaction intermediates. High pressure scanning tunneling microscopy of platinum single crystal surfaces showed adsorbate mobility during a catalytic reaction. Nanoparticle systems are used to determine the role of metal-oxide interfaces, site blocking and the role of surface structures in reactive surface chemistry. The size, shape and composition of nanoparticles play important roles in determining reaction activity and selectivity and is covered in this tutorial review.