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The Structural Phase Transition in Individual Vanadium Dioxide Nanoparticles

Published online by Cambridge University Press:  31 January 2011

Felipe Rivera ,
Robert C. Davis  and
Richard Vanfleet
Felipe Rivera
Affiliation:
rivera.felipe@yahoo.com, Brigham Young University, Physics and Astronomy, Provo, Utah, United States
Robert C. Davis
Affiliation:
robert_davis@physics.byu.edu, Brigham Young University, Physics and Astronomy, Provo, Utah, United States
Richard Vanfleet
Affiliation:
rrv3@physics.byu.edu, Brigham Young University, Physics and Astronomy, Provo, Utah, United States
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Abstract

Vanadium dioxide (VO2) single crystals undergo a structural first-order metal to insulator phase transition at approximately 68°C. This phase transition exhibits a resistivity change of up to 5 orders of magnitude in bulk specimens. We observe a 2-3 order of magnitude change in thin films of VO2. Individual particles with sizes ranging from 50 to 250 nm were studied by means of Transmission Electron Microscopy (TEM). The structural transition for individual particles was observed as a function of temperature. Furthermore, the interface between grains was also studied. We present our current progress in understanding this phase transition for polycrystalline thin films of VO2 from the view of individual particles.

Keywords

electron energy loss spectroscopy (EELS)phase transformationscanning transmission electron microscopy (STEM)
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1184: Symposium GG – Electron Crystallography for Materials Research and Quantitive Characterization of Nanostructured Materials , 2009 , 1184-GG02-04
Copyright
Copyright © Materials Research Society 2009

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