Dynamic nature of hydridosilsesquioxane clusters on gold surfaces

Kenneth T. Nicholson, K. Z. Zhang, Mark M. Banaszak Holl, F. R. McFeely, U. C. Pernisz

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14 Citations (Scopus)


The chemisorption of the hydridosilsesquioxane clusters H8Si8O12 and H10Si10O15 onto a freshly evaporated gold surface has been observed by X-ray photoemission and reflection-absorption infrared spectroscopies. On the basis of these analytical techniques and supporting nonlocal density functional calculations, a single Si-Au bond at a cluster vertex is created through a surprising gold-mediated Si-H bond activation. The chemisorbed clusters are stable in a vacuum and when exposed to oxygen or water. Coverage-dependent peak frequency and infrared intensity shifts, characteristic of a chemically dynamic interface, are detected as a function of cluster overpressure. An equilibrium between the clusters and the gold surface is proposed, evidenced by a fairly constant rate of adsorption to gold for several coverage regimes.

Original languageEnglish
Pages (from-to)8396-8403
Number of pages8
Issue number22
Publication statusPublished - 31 Oct 2000

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