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Reversible oxidation of WOx and MoOx nano phases

Paper ID Volume ID Publish Year Pages File Format Full-Text
55441 47053 2012 7 PDF Available
Title
Reversible oxidation of WOx and MoOx nano phases
Abstract

WOx and MoOx nano phases were prepared on TiO2(1 1 0) surfaces by a CVD procedure consisting of adsorption and decomposition of W(CO)6 or Mo(CO)6 precursors followed by annealing under UHV. Metal amount involved in each elaborated sample is in the fractional range from 0.1 to 0.35 equivalent monolayer (eqML) of W or Mo. Evolution of sample stoichiometry as a function of subsequent treatment is followed by valence band and core level photoemission as well as work function measurement. In each case, exposure of samples to molecular oxygen at room temperature induces an increase of sample work function in a range of several tenth of eV. Such a work function change is related to oxidation of sample involving both titanium and tungsten (or molybdenum) ions. Such an oxidation is reversible through an annealing under UHV at 470 K for molybdenum oxide and 670 K for tungsten oxide. Several cycles of exposure/annealing are possible without changes in work function or stoichiometry.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (216 K)Download as PowerPoint slideHighlights► WOx and MoOx nanophases prepared by Chemical Vapour Deposition (CVD) on TiO2(1 1 0). ► Evidence of reversibility during oxygen exposure/annealing cycles under UHV. ► Oxidation process can be followed by photoemission and work function measurements. ► Conductivity measurements underline changes from semiconductor to metal behavior.

Keywords
WOx; MoOx; TiO2; Photoemission; Oxygen exposure; Gas sensing
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 181, Issue 1, 12 February 2012, Pages 68–74
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us