Local electric field and configuration of CO molecules adsorbed on a nanostructured surface with nanocones |
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Authors: | You Rong-Yi and Huang Xiao-Jing |
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Institution: | Department of Physics, School of Science, Jimei University, Xiamen 361021, China |
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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. |
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Keywords: | metallic nanostructured surface nanocone adsorbed molecules local electric field |
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