Ag-Pt alloy nanoparticles with the compositions in the miscibility gap
- Department of Chemical Engineering, University of Rochester, Gavett Hall 206, Rochester, NY 14627-0166 (United States)
Silver platinum binary alloys with compositions between about Ag{sub 2}Pt{sub 98} and Ag{sub 95}Pt{sub 5} at <{approx} 400 deg. C have largely not been observed in bulk due to the large immiscibility between these two metals. We present in this paper that Ag-Pt alloy nanostructures can be made in a broad composition range. The formation of Ag-Pt nanostructures is studied by powder X-ray diffraction (PXRD) and energy-dispersive X-ray (EDX). Our results indicate that lattice parameter changes almost linearly with composition in these Ag-Pt nanomaterials. In another word, lattice parameter and composition relationship follows the Vegard's law, which is a strong indication for the formation of metal alloys. Our transmission electron microscopy (TEM) study shows that the silver-rich Ag-Pt alloy nanostructures have spherical shape, while the platinum-rich ones possess wire-like morphology. The stability and crystal phase are investigated by annealing the alloy nanostructures directly or on carbon supports. - Graphical abstract: While platinum and silver cannot form a solid solution with the composition between about Ag{sub 2}Pt{sub 98} and Ag{sub 95}Pt{sub 5} at 400 deg. C or below in bulk form, alloy particles and wires can be made within this miscibility gap at the nanometer scale.
- OSTI ID:
- 21128342
- Journal Information:
- Journal of Solid State Chemistry, Vol. 181, Issue 7; Other Information: DOI: 10.1016/j.jssc.2008.03.013; PII: S0022-4596(08)00141-2; Copyright (c) 2008 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 0022-4596
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
ANNEALING
BINARY ALLOY SYSTEMS
LATTICE PARAMETERS
MORPHOLOGY
NANOSTRUCTURES
PARTICLES
PLATINUM ALLOYS
POWDERS
SEGREGATION
SILVER ALLOYS
SOLID SOLUTIONS
SOLUBILITY
SPHERICAL CONFIGURATION
TEMPERATURE RANGE 0400-1000 K
TRANSMISSION ELECTRON MICROSCOPY
VEGARD LAW
X-RAY DIFFRACTION