DocumentCode :
3734691
Title :
Spectroscopic properties of hexagonal sodium tungstate nanorods
Author :
Tao Gao;Bj?rn Petter Jelle
Author_Institution :
Department of Architectural Design, History and Technology, Norwegian University of Science and Technology (NTNU), Trondheim, Norway
fYear :
2015
fDate :
7/1/2015 12:00:00 AM
Firstpage :
645
Lastpage :
648
Abstract :
Sodium tungstate (Na-WO3) nanorods with typical diameters of 10-200 nm and lengths of several microns were prepared via hydrothermal synthesis. X-ray diffraction showed that the material crystallized in a hexagonal phase (space group P6/mmm) with unit cell dimensions of a = 7.3166(8) Å and c = 3.8990(8) Å. The as-prepared Na-WO3 nanorods showed a distinctive visible-light-driven photochromism related to a proton-electron double injection process. The involved local structural evolutions were monitored by Fourier transform infrared (FTIR) and Raman scattering spectroscopy. One diagnostic FTIR absorption at 585 cm-1 and one Raman band at 813 cm-1 were identified and assigned to the O-W-O stretching vibration. These two modes were strongly affected by the proton and electron insertion, showing promises for studying the chromogenic properties of hexagonal WO3 materials.
Keywords :
"Vibrations","Raman scattering","Protons","Ions","Electron optics","Tungsten","X-ray scattering"
Publisher :
ieee
Conference_Titel :
Nanotechnology (IEEE-NANO) , 2015 IEEE 15th International Conference on
Type :
conf
DOI :
10.1109/NANO.2015.7388688
Filename :
7388688
Link To Document :
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