{"title":"W/sup +6//W/sup +5/ redox reactions at the interface of the nanocrystalline TiO/sub 2/ photoactive electrode","authors":"Yongxiang Li, J. Hagen, D. Haarer","doi":"10.1109/COMMAD.1998.791685","DOIUrl":null,"url":null,"abstract":"Photocurrent of nanocrystalline TiO/sub 2/ thin films has been probed by using a steady-state photoconduction technique. A broad single peak (280-410 nm) photocurrent spectrum was observed for the TiO/sub 2/ thin films. The photocurrent maximum at about 360 nm associates with the direct band gap of anatase TiO/sub 2/. The electron-hole pair formation that occurs at the interface between semiconductor TiO/sub 2/ nanoparticles and a solution upon absorption of near UV light leads to redox reactions of solution species (W/sup +6//W/sup +5/). The mechanism of such photodriven processes are discussed along with the potential applications in photoelectrochemical cells and as particulate photochromic systems.","PeriodicalId":300064,"journal":{"name":"1998 Conference on Optoelectronic and Microelectronic Materials and Devices. Proceedings (Cat. No.98EX140)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"1998-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"1998 Conference on Optoelectronic and Microelectronic Materials and Devices. Proceedings (Cat. No.98EX140)","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/COMMAD.1998.791685","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 0
Abstract
Photocurrent of nanocrystalline TiO/sub 2/ thin films has been probed by using a steady-state photoconduction technique. A broad single peak (280-410 nm) photocurrent spectrum was observed for the TiO/sub 2/ thin films. The photocurrent maximum at about 360 nm associates with the direct band gap of anatase TiO/sub 2/. The electron-hole pair formation that occurs at the interface between semiconductor TiO/sub 2/ nanoparticles and a solution upon absorption of near UV light leads to redox reactions of solution species (W/sup +6//W/sup +5/). The mechanism of such photodriven processes are discussed along with the potential applications in photoelectrochemical cells and as particulate photochromic systems.
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