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Designing Diameter-Modulated Heterostructure Nanowires of PbTe/Te by Controlled Dewetting

Kumar, Abinash and Kundu, Subhajit and Samantaray, Debadarshini and Kundu, Paromita and Zanaga, Daniele and Bals, Sara and Ravishankar, N (2017) Designing Diameter-Modulated Heterostructure Nanowires of PbTe/Te by Controlled Dewetting. In: NANO LETTERS, 17 (12). pp. 7226-7233.

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Official URL: http://dx.doi.org/10.1021/acs.nanolett.7b02442

Abstract

Heterostructures consisting of semiconductors with controlled morphology and interfaces find applications in many fields. A range of axial, radial, and diameter-modulated nanostructures have been synthesized primarily using vapor phase methods. Here, we present a simple wet chemical routine to synthesize heterostructures of PbTe/Te using Te nanowires as templates. A morphology evolution study for the formation of these heterostructures has been performed. On the basis of these control experiments, a pathway for the formation of these nanostructures is proposed. Reduction of a Pb precursor to Pb on Te nanowire templates followed by interdiffusion of Pb/Te leads to the formation of a thin shell of PbTe on the Te wires. Controlled dewetting of the thin shell leads to the formation of cube-shaped PbTe that is periodically arranged on the Te wires. Using control experiments, we show that different reactions parameters like rate of addition of the reducing agent, concentration of Pb precursor and thickness of initial Te nanowire play a critical role in controlling the spacing between the PbTe cubes on the Te wires. Using simple surface energy arguments, we propose a mechanism for the formation of the hybrid. The principles presented are general and can be exploited for the synthesis of other nanoscale heterostructures.

Item Type: Journal Article
Additional Information: Copy right for this article belongs to the AMER CHEMICAL SOC, 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
Department/Centre: Division of Chemical Sciences > Materials Research Centre
Depositing User: Id for Latest eprints
Date Deposited: 20 Jan 2018 05:55
Last Modified: 20 Jan 2018 05:55
URI: http://eprints.iisc.ac.in/id/eprint/58837

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