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Chin. Phys., 2001, Vol. 10(13): 84-95    DOI: 10.1088/1009-1963/10/13/017
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ADSORPTION BEHAVIOR OF AMINO ACIDS ON COPPER SURFACES

Zhao Xue-ying, Wang Hao, Yan Hao, Gai Zheng, Zhao Ru-guang, Yang Wei-sheng
The Mesoscopic Physics Laboratory and Department of Physics, Peking University, Beijing 100871, China
Abstract  The major results of a series of our recent investigations on the adsorption of eight amino acids on Cu(001) and (111) surfaces are reviewed in the present paper. In all studied cases the molecules adsorb onto the surface in their anionic form. With the increase of the coverage three different 2D phases of the adsorbates, that is, the 2D lattice gas, intermediate, and solid phases, appear sequentially, although for few systems one or two of them do not appear. In both the 2D lattice gas and intermediate phases the molecules "stand" with their two oxygen "feet" on the surface and the intermolecular interactions are repulsive, although in the former they can diffuse frequently whereas in the latter they are discommensurate in one direction with the substrate. In the solid phase the molecules "lie" down on the surface to form commensurate superstructures. Adsorption of amino acids may often induce step faceting as well as bunching to form facets. Adsorption of L-lysine on Cu(001) may cause steps bunching to form facets with all the same chirality. Our preliminary results show that it is possible to manipulate individual molecules with the STM tip even at room temperature. These results may have applications in nano-materials, nano-technology, and very likely also in chiral separations or enantioselective heterogeneous catalysis.
Keywords:  hydrogen bonds      single crystal metal surfaces      adsorption      amino acids      organic molecules      step faceting  
Received:  04 December 2000      Revised:  18 April 2001      Published:  07 July 2005
PACS:  8230  
  8265  
  7300  
  0779  
Fund: Project supported by the National Natural Science Foundation of China (Grant No. 19634010) and by the Doctoral Foundation of Institution of Higher Education of China.

Cite this article: 

Zhao Xue-ying, Wang Hao, Yan Hao, Gai Zheng, Zhao Ru-guang, Yang Wei-sheng ADSORPTION BEHAVIOR OF AMINO ACIDS ON COPPER SURFACES 2001 Chin. Phys. 10 84

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