Thermal diffusion of Co into sputtered ZnO:Co thin film for enhancing visible-light-induced photo-catalytic activity

Chi Yuan Kao, Jiunn-Der Liao, Chia Wei Chang, Ru Yang Wang

研究成果: Article

14 引文 (Scopus)

摘要

ZnO has received a lot of attention in for the degradation and complete mineralization of environmental pollutants. In this study, efficient ZnO-based visible-light photocatalysts are synthesized via a low-cost method by increasing the Co concentration at the outermost surface of ZnO:Co thin film under an annealing process. The simply adjusted Co concentration gradient (≈1.5% increase) into the surface of ZnO:Co is driven by thermal diffusion. Co ions substitute Zn sites in the ZnO lattice. The band gap narrowed due to sp-d exchange interactions between the conduction band electrons and the d electrons of Co. The annealing process enhances the grain size and the degree of crystallinity of the diffused Co/ZnO:Co, which contributes to the absorption edge red-shift. Photocatalytic activities such as the photo-degradation of methylene blue and the inactivation of bacteria are obviously enhanced. The proposed low-cost method significantly increases the efficiency of ZnO for the generation of the photocatalytic effect under visible-light exposure.

原文English
頁(從 - 到)1813-1818
頁數6
期刊Applied Surface Science
258
發行號5
DOIs
出版狀態Published - 2011 十二月 15

指紋

Thermal diffusion
Catalyst activity
Annealing
Thin films
Environmental Pollutants
Electrons
Methylene Blue
Exchange interactions
Photodegradation
Photocatalysts
Conduction bands
Costs
Bacteria
Energy gap
Ions
Degradation

All Science Journal Classification (ASJC) codes

  • Surfaces, Coatings and Films

引用此文

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Thermal diffusion of Co into sputtered ZnO:Co thin film for enhancing visible-light-induced photo-catalytic activity. / Kao, Chi Yuan; Liao, Jiunn-Der; Chang, Chia Wei; Wang, Ru Yang.

於: Applied Surface Science, 卷 258, 編號 5, 15.12.2011, p. 1813-1818.

研究成果: Article

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