Temperature- and Size-Dependent Compositionally Tuned Microstructural Landscape for Ag-46 Atom % Cu Nanoalloy Prepared by Laser Ablation in Liquid

Malviya, Kirtiman Deo and Chattopadhyay, K (2016) Temperature- and Size-Dependent Compositionally Tuned Microstructural Landscape for Ag-46 Atom % Cu Nanoalloy Prepared by Laser Ablation in Liquid. In: JOURNAL OF PHYSICAL CHEMISTRY C, 120 (48). pp. 27699-27706.

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Abstract

We report a temperature- and size-dependent compositionally tuned microstructural landscape for Ag-46 atom % Cu alloy nanoparticles. The microstructural and morphological changes were established through the technique of in situ transmission electron microscopy. The nanoparticles were synthesized by laser ablation of alloy target in an aqueous medium. The as-synthesized particles predominantly contain nanosized grains of a single-phase solid solution with grains having sizes similar to 3 +/- 0.5 nm. For particles with smaller sizes (similar to 20 nm), the solid solution decomposes and grains coarsen on heating to yield predominantly bicrystals containing two phases of Ag-rich and Cu-rich solid solution. The microstructure of the larger particles (>= 40 nm) evolves through segregation of Ag and their preferential growth near the surface of the particles. This leads to a core shell-like composition distribution at a certain range of temperatures (>= 200 degrees C) and sizes (>= 32 nm). At higher temperatures, these core shell particles undergo a morphological transition through grain growth yielding bicrystals of two phases. We present a size- and temperature-dependent morphology diagram that captures these changes.

Item Type:	Journal Article
Publication:	JOURNAL OF PHYSICAL CHEMISTRY C
Additional Information:	Copy right for this article belongs to theAMER CHEMICAL SOC, 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	31 Jan 2017 04:34
Last Modified:	31 Jan 2017 04:34
URI:	http://eprints.iisc.ac.in/id/eprint/55964

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