Combinatorial approach to the study of particle size effects in electrocatalysis: synthesis of supported gold nanoparticles

Guerin, Samuel, Hayden, Brian E., Pletcher, Derek, Rendall, Michael E, Suchsland, Jens-Peter and Williams, Laura J. (2006) Combinatorial approach to the study of particle size effects in electrocatalysis: synthesis of supported gold nanoparticles. Journal of Combinatorial Chemistry, 8 (5), 791-798. (doi:10.1021/cc060040k).

Abstract

A high-throughput method for physical vapor deposition has been applied to the synthesis of libraries of supported gold particles on amorphous substoichiometric TiOx and carbon supports. The TiOx substrate stoichiometry can be varied or kept constant across a supporting sample, and subsequent deposition of particle sizes on supports are controlled through the nucleation and growth process. TEM measurements indicate nucleation and growth of Au particles takes place, with the smallest particles initially observed at 1.4 nm with a maximum density of 5.5 X 10(12) cm(-2) on titania, and 2.6 nm with concomitantly lower density on carbon. The 1.4-nm particles on titania exhibit a binding energy shift in the Au(4f) core level of 0.3 eV from bulk gold, and the shift is similar to 0.1 eV by the time particles grow to a mean size of 2.5 nm. These shifts are associated with final state effects, and the supported gold particles are metallic and appear to be relatively stable in air. When combined with appropriate substrates and screening techniques, this method provides a highly controllable method for the high-throughput synthesis of model supported catalyst.

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Contributors

Author: Brian E. Hayden

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