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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 ] |
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