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Combined Effect of Temperature Induced Strain and Oxygen Vacancy on Metal-Insulator Transition of VO2 Colloidal Particles

Gurunatha, KL; Sathasivam, S; Li, J; Portnoi, M; Parkin, IP; Papakonstantinou, I; (2020) Combined Effect of Temperature Induced Strain and Oxygen Vacancy on Metal-Insulator Transition of VO2 Colloidal Particles. Advanced Functional Materials 10.1002/adfm.202005311. Green open access

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Abstract

Vanadium dioxide (VO2) is a promising material in the development of thermal and electrically sensitive devices due to its first order reversible metal-insulator transition (MIT) at 68 °C. Such high MIT temperature (TC) largely restricts its widespread application which could be enabled if a straightforward tuning mechanism were present. Here this need is addressed through a facile approach that uses the combined effects of temperature induced strain and oxygen vacancies in bulk VO2 colloidal particles. A simple thermal annealing process under varying vacuum is used to achieve phase transformation of metastable VO2(A) into VO2(M2), (M2+M3), (M1) and higher valence V6O13 phases. During this process, distinct multiple phase transitions including increased as well as suppressed TC are observed with respect to the annealing temperature and varied amount of oxygen vacancies respectively. The latent heat of phase transition is also significantly improved upon thermal annealing by increasing the crystallinity of the samples. This work not only offers a facile route for selective phase transformation of VO2 as well as to manipulate the phase transition temperature, but also contributes significantly to the understanding of the role played by oxygen vacancies and temperature induced stress on MIT which is essential for VO2 based applications.

Type: Article
Title: Combined Effect of Temperature Induced Strain and Oxygen Vacancy on Metal-Insulator Transition of VO2 Colloidal Particles
Open access status: An open access version is available from UCL Discovery
DOI: 10.1002/adfm.202005311
Publisher version: http://dx.doi.org/10.1002/adfm.202005311
Language: English
Additional information: © 2020 The Authors. Published by Wiley-VCH GmbH. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
Keywords: metal‐insulator transitions, oxygen vacancies, structural phase transitions, temperature induced strain, vanadium dioxide
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Chemistry
URI: https://discovery.ucl.ac.uk/id/eprint/10110463
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