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Title: Direct synthesis of thermochromic VO{sub 2} through hydrothermal reaction

Thermochromic VO{sub 2} was directly synthesized using hydrothermal techniques. The effects of formation conditions on the structure and morphology of the final product were studied through X-ray diffraction (XRD), and scanning electron microscopy (SEM). Unique hollow sphere morphology was observed for the synthesized VO{sub 2} powders. Ex-situ XRD studies after heat treatment confirmed the thermal stability of the VO{sub 2} structure. Thermochromic properties, as a consequence of the reversible structural transformation between monoclinic VO{sub 2} and tetragonal phases, were observed by Fourier transform infrared spectroscopy (FTIR). - Graphical abstract: Thermochromic VO{sub 2} crystals with hollow spherical and asterisk shape were directly synthesized using hydrothermal techniques. X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR) studies confirmed the thermal stability and the reversible thermochromic properties of the VO{sub 2} structure. - Highlights: • One-step synthesis of thermochromic VO{sub 2} monoclinic phase, and VO{sub 2} (A and B phases) using hydrothermal technique. VO{sub 2} (A), VO{sub 2} (B). • Identification of the relationship between synthesis conditions and the morphology/structure of the final products. • Formation of VO{sub 2} monoclinic phase with an interesting hollow sphere shape. • Demonstration of superior thermal stability of the VO{sub 2} monoclinic phase. • Characterizing the thermochromicmore » properties of VO{sub 2} monoclinic phase.« less
Authors:
 [1] ;  [2] ;  [1] ;  [1] ;  [2] ; ;  [1] ;  [3] ;  [1] ;  [2] ;  [1] ;  [1]
  1. National Renewable Energy Laboratory, 15013 Denver West Parkway, Golden, CO (United States)
  2. (United States)
  3. The University of Toledo, Toledo, OH 43606 (United States)
Publication Date:
OSTI Identifier:
22334188
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Solid State Chemistry; Journal Volume: 212; Other Information: Copyright (c) 2014 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; CRYSTALS; FOURIER TRANSFORM SPECTROMETERS; FOURIER TRANSFORMATION; HYDROTHERMAL SYNTHESIS; INFRARED SPECTRA; MONOCLINIC LATTICES; SCANNING ELECTRON MICROSCOPY; VANADIUM OXIDES; X-RAY DIFFRACTION