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Raman spectroscopy of WO 3 nano‐wires and thermo‐chromism study of VO 2 belts produced by ultrasonic spray and laser pyrolysis techniques
Author(s) -
Mwakikunga B. W.,
SiderasHaddad E.,
Forbes A.,
Arendse C.
Publication year - 2008
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.200776829
Subject(s) - raman spectroscopy , monoclinic crystal system , materials science , phonon , nano , spectroscopy , hysteresis , analytical chemistry (journal) , rutile , condensed matter physics , optics , chemistry , crystallography , crystal structure , composite material , physics , chromatography , quantum mechanics , organic chemistry
Novel optical and electrical properties of newly synthesized nano‐wires of monoclinic WO 3 and nano‐belts of rutile VO 2 have been investigated by Raman spectroscopy and thermo‐chromism studies respectively. Phonon confinement is observed in the WO 3 nano‐wires and the previously modified Richter equation is fitted to the experimental Raman spectroscopy data to obtain the optical phonon dispersion relations for the 713 cm –1 branch and the 808 cm –1 branch of WO 3 phonon spectra for the first time. Electrical measurements on the VO 2 nano‐belts at varying temperature reveal an enhanced hysteresis width of about 83 °C surpassing previously reported values on the thermo‐chromism studies on VO 2 . (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)