title: Depressed phase transition in solution-grown VO2 nanostructures.
abstract: The first-order metal-insulator phase transition in VO(2) 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 VO(2) to nanoscale dimensions. A simple hydrothermal protocol yields anisotropic free-standing single-crystalline VO(2) 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 stoichiometry and dimensions of VO(2) nanostructures to tune the phase transition in this system.
authors.affiliation: Department of Chemistry, University at Buffalo, State University of New York, Buffalo, New York 14260, USA.
authors.forename: Luisa
authors.initials: L
authors.lastname: Whittaker
authors.forename: Cherno
authors.initials: C
authors.lastname: Jaye
authors.forename: Zugen
authors.initials: Z
authors.lastname: Fu
authors.forename: Daniel A
authors.initials: DA
authors.lastname: Fischer
authors.forename: Sarbajit
authors.initials: S
authors.lastname: Banerjee