Size- and Support-Dependent Electronic and Catalytic Properties of Au0/Au3+ 
Nanoparticles Synthesized from Block Copolymer Micelles

Roldan Cuenya, Beatriz; Baeck, Sung-Hyeon; Jaramillo, Thomas F; McFarland, Eric W.

doi:/10.1021/ja036468u

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Size- and Support-Dependent Electronic and Catalytic Properties of Au⁰/Au³⁺ Nanoparticles Synthesized from Block Copolymer Micelles

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Roldan Cuenya, B., Baeck, S.-H., Jaramillo, T. F., & McFarland, E. W. (2003). Size- and Support-Dependent Electronic and Catalytic Properties of Au⁰/Au³⁺ Nanoparticles Synthesized from Block Copolymer Micelles. Journal of the American Chemical Society, 125(42), 12928-12934. doi:/10.1021/ja036468u.

Cite as: https://hdl.handle.net/21.11116/0000-0006-E415-1

Abstract

Supported Au nanoclusters synthesized from diblock copolymer micelles can be reliably prepared with well-controlled sizes and dispersions. For particles with diameters between approximately 1 and 6 nm, the particle size and the support were found to strongly influence the oxygen reactivity, the formation and stabilization of a metal-oxide, and the catalytic activity for electrooxidation of carbon monoxide. The smallest particles studied (1.5 nm) were the most active for electrooxidation of CO and had the largest fraction of oxygen associated with gold at the surface as measured by the Au³⁺/Au⁰ X-ray photoemission intensities. Conducting and semiconducting substrates, ITO-coated glass and TiO₂, respectively, were associated with greater stabilization of Au³⁺ oxide as compared to insulating, SiO₂, substrates.