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Chin. Phys. B, 2009, Vol. 18(9): 3970-3974    DOI: 10.1088/1674-1056/18/9/058
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES Prev   Next  

Local electric field and configuration of CO molecules adsorbed on a nanostructured surface with nanocones

You Rong-Yi(游荣义) and Huang Xiao-Jing(黄晓菁)
Department of Physics, School of Science, Jimei University, Xiamen 361021, China
Abstract  Based on the nanostructured surface model that the (platinum, Pt) nanocones grow out symmetrically from a plane substrate, the local electric field near the conical nanoparticle surface is computed and discussed. On the basis of these results, the adsorbed CO molecules are modelled as dipoles, and three kinds of interactions, i.e. interactions between dipoles and local electric field, between dipoles and dipoles, as well as between dipoles and nanostructured substrate, are taken into account. The spatial configuration of CO molecules adsorbed on the nanocone surface is then given by Monte-Carlo simulation. Our results show that the CO molecules adsorbed on the nanocone surface cause local agglomeration under the action of an external electric field, and this agglomeration becomes more compact with decreasing conical angle, which results in a stronger interaction among molecules. These results serve as a basis for explaining abnormal phenomena such as the abnormal infrared effect (AIRE), which was found when CO molecules were adsorbed on the nanostructured transition-metal surface.
Keywords:  metallic nanostructured surface      nanocone      adsorbed molecules      local electric field  
Received:  13 December 2008      Revised:  25 December 2008      Accepted manuscript online: 
PACS:  68.43.-h (Chemisorption/physisorption: adsorbates on surfaces)  
  61.46.Df (Structure of nanocrystals and nanoparticles ("colloidal" quantum dots but not gate-isolated embedded quantum dots))  
  78.30.Hv (Other nonmetallic inorganics)  
Fund: Project supported by the Natural Science Foundation of Fujian Province of China (Grant Nos C0710036 and T0750008).

Cite this article: 

You Rong-Yi(游荣义) and Huang Xiao-Jing(黄晓菁) Local electric field and configuration of CO molecules adsorbed on a nanostructured surface with nanocones 2009 Chin. Phys. B 18 3970

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