Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 131, Issue 25, Pages 8884-8894Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ja902054w
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Funding
- University at Buffalo
- Fulbright Foundation fellowship
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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 freestanding single-crystalline VO2 nanostructures with a phase-transition temperature depressed to as low as 32 degrees C from 67 degrees 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.
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