Title: Effect of annealing on metal-insulator transition of VO₂ (M) nanorods

Authors: Ying Luo; Ming Li; Guanghai Li

Addresses: Key Laboratory of Materials Physics, Anhui Key Laboratory of Nanomaterials and Nanotechnology, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, China ' Key Laboratory of Materials Physics, Anhui Key Laboratory of Nanomaterials and Nanotechnology, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, China ' Key Laboratory of Materials Physics, Anhui Key Laboratory of Nanomaterials and Nanotechnology, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, China

Abstract: The influence of annealing treatment on the metal-insulator transition (MIT) of VO₂ (M) nanorods was studied. The phase structure and content of the products were analysed by X-ray diffractometer (XRD), and the MIT was analysed by differential scanning calorimeter (DSC). It was found that VO₂ (M) nanorods have uneven thickness and round tip in comparison with a uniform thickness and sharp tip in VO₂ (B) nanorods, and there are two MITs in the DSC curves in the phase mixture of VO₂ (M) and VO₂ (B), one is situated at low temperature region and another is at high temperature side, and the high temperature MIT exists only in pure VO₂ (M) at and beyond annealing temperature of 550°C. The mechanisms of these two MITs were discussed and analysed.

Keywords: vanadium dioxide; VO2; nanorods; annealing treatment; metal-insulator transition; MIT; thermochromic; nanotechnology.

DOI: 10.1504/IJNP.2014.064870

International Journal of Nanoparticles, 2014 Vol.7 No.2, pp.142 - 154

Received: 31 Mar 2014
Accepted: 17 Apr 2014
Published online: 30 Sep 2014 *

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