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Variable Temperature Study of Au and Au-Pt Nanoparticles on Selected Oxide Supports

Published online by Cambridge University Press:  01 February 2011

D. Barrett ,
P. Franklyn  and
M. Scurrell
D. Barrett
Affiliation:
School of Chemistry, University of the Witwatersrand, Johannesburg, South Africa, P O Wits, South Africa, 2050. E-mail: [email protected]
P. Franklyn
Affiliation:
School of Chemistry, University of the Witwatersrand, Johannesburg, South Africa, P O Wits, South Africa, 2050. E-mail: [email protected]
M. Scurrell
Affiliation:
School of Chemistry, University of the Witwatersrand, Johannesburg, South Africa, P O Wits, South Africa, 2050. E-mail: [email protected]
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Abstract

We report on the size relationship of Au and Au-Pt nanoparticles that were synthesised on silica and anatase phase titania supports. Deposition-precipitation (DP) of metal chlorides with the addition of urea and ammonium hydroxide was used to produce the nanoparticles. The relative particle size relationship of the Au and Au-Pt nano particles (NP's) was investigated, relating the Pt concentration and the support polymorph over a temperature range. It was found, with the use of in-situ variable temperature powder X-ray diffraction (VT-PXRD) and transmission electron microscopy (TEM), that the addition of Pt to the Au system corresponded to a reduction in particle size over a broad temperature range.

Keywords

Au-Pt nanoparticlesDeposition-precipitationin situ XRDRietveld
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1279: New Catalytic Materials , 2010 , 40
Copyright
Copyright © Materials Research Society 2010

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