24小时热门版块排行榜

返回列表

当前主题已经存档。

白桦林

至尊木虫 (文坛精英)

应助: 17 (小学生)
金币: 11522
红花: 4
帖子: 10142
在线: 229.6小时
虫号: 137712
注册: 2005-12-17
专业: 胶体与界面化学

[交流] 分享一篇好文章

Molecular surface chemistry by metal single crystals and nanoparticles from vacuum to high pressure

Gabor A. Somorjai*ab and Jeong Y. Parkab
Received 5th April 2008
First published as an Advance Article on the web 30th July 2008
DOI: 10.1039/b719148k
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, OQO 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.

http://www.rsc.org/Publishing/Jo ... le.asp?doi=b719148k

[ Last edited by 白桦林 on 2008-12-6 at 18:04 ]

回复此楼