-, Govind and Chen, Wenhua and Wang, Hao and Madey, T. E. (2009) Formation of Oxygen Induced Nanopyramids on Rh(210) Surface. In: TRANSPORT AND OPTICAL PROPERTIES OF NANOMATERIALS: Proceedings of the International Conference—ICTOPON‐2009, 5–8 January 2009 , Allahabad (India).

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Abstract

Formation of oxygen induced nano pyramids on atomically rough and morphological unstable Rh (210) surface has been studied using Auger electron spectroscopy (AES), low energy electron diffraction (LEED), and UHV-scanning tunneling microscopy (STM). Nanometer sized pyramids can be formed upon annealing the oxygen-covered Rh (210) surface at >= 550K in the presence of oxygen (10(-8) Toff) and the facets of the pyramids are identified as two {731} face and a (110) face. The study suggests that the oxygen overlayer can be removed from the surface via catalytic reaction at low temperature using CO oxidation while preserving ("freezing") the pyramidal facet structure. The resulting clean faceted surface remains stable for T similar to 600 K and for temperatures above this value, the surface irreversibly relaxes to the planar state. Atomically resolved STM measurements confirm the formation of nanopyramids with average pyramid size similar to 18nm. The nanopyramidal faceted Rh surface will be used as nanotemplates for growth of nanometer-scale clusters.

Item Type:	Conference or Workshop Item (Paper)
Subjects:	Optics Physics
Divisions:	UNSPECIFIED
Depositing User:	Ms Neetu Chandra
Date Deposited:	30 Aug 2012 09:00
Last Modified:	30 Aug 2012 09:00
URI:	http://npl.csircentral.net/id/eprint/509

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