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Scanning tunneling microscopy and spectroscopy of silver and platinum catalysts

Rao, CNR and Aiyer, Hemant Kumar N and Arunarkavalli, T and Kulkarni, GU (1994) Scanning tunneling microscopy and spectroscopy of silver and platinum catalysts. In: Catalysis Letters, 23 (1-2). pp. 37-47.

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Abstract

Scanning tunneling microscopic studies of silver catalysts dispersed on highly oriented pyrolitic graphite (HOPG) with 2, 5 and 10 wt% metal loading prepared by wet impregnation and hydrogen reduction show spherical crystallites, with the 2 wt% catalysts having an average crystaUite size of \sim 2 nm and the 5 and 10 wt% catalysts with size distributions of 2-5 and 4-12 nm respectively. The Ag catalysts prepared by $NaBH_4$ reduction show a narrower size distribution. Pt/HOPG catalysts with 2 and 5 wt% metal loading prepared by wet-impregnation and hydrogen reduction show large (2-11 nm) raft-like crystallites; small crystallites (\sim 1 nm) could be obtained by $NaBH_4$ reduction. Tunneling spectroscopic measurements reveal the nonmetallic nature of crystallites on the surface of Ag(2 wt%)/HOPG as well as Pt/HOPG prepared by $NaBH_4$ reduction.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Springer.
Keywords: Scanning tunneling microscopy (STM);scanning tunneling spectroscopy (STS);silver catalysts;Pt catalysts;STM study of Ag and Pt catalysts
Department/Centre: Division of Chemical Sciences > Materials Research Centre
Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited: 30 Jun 2008
Last Modified: 19 Sep 2010 04:46
URI: http://eprints.iisc.ernet.in/id/eprint/14619

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