Tungsten Oxide Nanostructures Growth in HFCVD System by Slow Positron Beam

J. Lou; B.J. Ye; X.P. Wang; H.M. Weng; Huai Jiang Du; Z.B. Zhang

doi:10.4028/www.scientific.net/MSF.607.195

Paper Titles

Investigation of Interfacial Interaction and Microstructure for Epoxy/CNTs Nanocomposites by PALS
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Positron Study of Carbon Black Parameters: Structure and Surface Area
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Open-Nano Pores in Natural Minerals Studied by Positron Lifetime Spectroscopy
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Study of the Defect Formation of Helium in Nanocrystalline Titanium Films
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Tungsten Oxide Nanostructures Growth in HFCVD System by Slow Positron Beam
p.195

Positron Annihilation in Carbon Nanotubes
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Formation of Ordered Pores Determined by Positronium Time of Flight Spectroscopy
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Influence of Sintering Temperature on Defects in Porous Silica Monoliths Studied by Positron Annihilation Techniques
p.204

Porous Structure of Mesoporous Silica Studied by Positron Annihilation Lifetime Spectroscopy
p.207

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Tungsten Oxide Nanostructures Growth in HFCVD System by Slow Positron Beam

Abstract:

Tungsten oxide (WOx) nanostructures were prepared by a hot filament chemical vapor deposition (HFCVD) system. Two series of samples were synthesized by adjusting filaments temperature (Tf) and oxygen gas concentration (OGC). The crystallinity and stoichiometry were highly related to Tf and OGC. The evolution of stoichiometry and types of defects was illuminated by slow positron implantation spectroscopy (SPIS). A turning point of Tf=1750°C was found that at this point the crystallinity and stoichiometry natures were the best. In order to develop the chemical phase from substoichiometric to stoichiometric, the oxygen gas concentration in the mixture gas during deposition should be raised to an appropriate level.