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

Journal article


Kargal, G L, Sathasivam, S., Li, J., Portnoi, M., Parkin, I. P. and Papakonstantinou, I (2020). Combined Effect of Temperature Induced Strain and Oxygen Vacancy on Metal‐Insulator Transition of VO2 Colloidal Particles. Advanced Functional Materials. 30 (49), p. 2005311. https://doi.org/10.1002/adfm.202005311
AuthorsKargal, G L, Sathasivam, S., Li, J., Portnoi, M., Parkin, I. P. and Papakonstantinou, I
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.

Year2020
JournalAdvanced Functional Materials
Journal citation30 (49), p. 2005311
PublisherWiley
ISSN1616-3028
Digital Object Identifier (DOI)https://doi.org/10.1002/adfm.202005311
Publication dates
Print09 Sep 2020
Publication process dates
Accepted29 Jul 2020
Deposited05 Dec 2022
Publisher's version
License
File Access Level
Open
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