2008 NSTI Nanotechnology Conference and Trade Show - Nanotech 2008 - 11th Annual

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TechConnect Summit
Clean Technology 2008

Electronic structures of Pt clusters adsorbed on carbon nanotube

D.H. Chi, N.T. Cuong, A. Sugiyama, T. Mitani
Japan Advanced Institute of Science and Technology, JP

catalyst, nano particle, carbon nanotube

The combination of nanoclusters and carbon nanotube supports are proposed as a solution for superior heterogeneous catalysis. Recently, we succeeded in establishing a new concept for synthesizing highly dispersed and size-controlled nanoparticles on carbon nanotube supports. In complexes consisting of nanotubes and foreign nanoparticles, the peculiar electron states which are localized near surface of particle and nanotube play the central roll in the adsorption process of foreign species, which affect strongly to the performance of catalytic activities. To clarify the nature of cluster formation of Pt on carbon nanotube and the catalytic activity of the new materials, we performed a density functional theory study for the adsorption of Pt atom and clusters on surface of carbon nanotube. Adsorption of a Pt atom shows a heavy dependence of both binding energy and diffusion barrier on the surface curvature, and the adsorbed Pt atoms tend to form clusters, than to disperse. Charge transfer from Pt cluster to carbon supports and charge re-distribution among Pt atoms take place, and vary as a function of cluster size. Adsorption of O2 on Pt cluster on carbon nanotube was also investigated. Indirect charge transfer from carbon nanotube to O2 explains the experimental observation of improvement in catalytic activities of the materials.

Nanotech 2008 Conference Program Abstract