Depressed Phase Transition in Solution-Grown VO2 Nanostructures
- 8 June 2009
- journal article
- research article
- Published by American Chemical Society (ACS) in Journal of the American Chemical Society
- Vol. 131 (25), 8884-8894
- https://doi.org/10.1021/ja902054w
Abstract
The first-order metal—insulator phase transition in VO2 is characterized by an ultrafast several-orders-of-magnitude change in electrical conductivity and optical transmittance, which makes this material an attractive candidate for the fabrication of optical limiting elements, thermochromic coatings, and Mott field-effect transistors. Here, we demonstrate that the phase-transition temperature and hysteresis can be tuned by scaling VO2 to nanoscale dimensions. A simple hydrothermal protocol yields anisotropic free-standing single-crystalline VO2 nanostructures with a phase-transition temperature depressed to as low as 32 °C from 67 °C in the bulk. The observations here point to the importance of carefully controlling the stochiometry and dimensions of VO2 nanostructures to tune the phase transition in this system.Keywords
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