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Effect of chromium doping on the electrical and catalytic properties of powder titania under UV and visible illumination

✍ Scribed by Jean-Marie Herrmann; Jean Disdier; Pierre Pichat

Publisher
Elsevier Science
Year
1984
Tongue
English
Weight
368 KB
Volume
108
Category
Article
ISSN
0009-2614

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✦ Synopsis

C.A'.X.S., -7, awtme .4lbcrt Einsrein. 696-76 Villc~rrharz~~e Cedes. France Recrivcd 16 .4pril 1983 Al~l~~~l~ Cr-doped (0.85 at%) 'IX02 absorbs in the visible region, it bccomcs 3 photoconductor only through band-pap illumin;ltion and the doping causes a considerable decrease in photoconductsncc. Its activity for oxidations (oxalic acid, propcne, I-propanol) and for oxygen isotope eschanfe is nil under visible illumination and is 25-1000 tirncs diminished under UV light. This is attributed to an increasc in electron-hole recombination at rhc <'r". Ion sites. Convcrscly, Ginilar dopinss might be cnviwpsd to enhance rhc light stability of Ti02-containinr matcri:Ils it' the calorimetric propcrtics were maintained.

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## Abstract A series of lightly Tl‐doped CdO thin films (1%, 1.5%, 2%, 2.5%, and 3%) have been prepared by a vacuum evaporation method on glass and Si wafer substrates. The prepared films were subjected to structural study by X‐ray diffraction, optical characterisation by UV–VIS–NIR absorption spec