Structural, morphological, optical and photocatalytic characterization of ZnO-SnO₂ thin films prepared by the sol-gel technique

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• 作者：D.Y. Torres Mart&iacute ; nez^a ; R. Castanedo Pé ; rez^a ; ^{rcastanedo@qro.cinvestav.mx} ; G. Torres Delgado^a ; O. Zelaya Á ; ngel^b
• 关键词：Photocatalysis ; ZnO ; SnO2 ; Thin films ; Sol&ndash ; gel
• 刊名：Journal of Photochemistry and Photobiology A ; Chemistry
• 出版年：2012
• 期刊代码：66_10106030
• 类别：ch
• 出版时间：1 May, 2012
• 卷：235
• 期：Complete
• 页码：49-55
• 文件大小：1174 K

摘要

Thin films of the mixed ZnO-SnO₂ system were obtained by employing the sol-gel technique, starting from the mixture of zinc oxide and tin oxide precursor solutions. The tin atomic concentration percentages (X) in the precursor solutions with respect to the ZnO + SnO₂ total growing solution were: 0, 10, 20, 30, 40 and 100 at.%, here, the ZnO atomic percentage is (100-X). The films were deposited by the dip coating method on glass substrates and were sintered at 450, 500 and 550 掳C, in an open atmosphere. The X-ray diffraction patterns show the presence of zinc oxide and tin oxide crystals. The optical properties of the films were studied by UV-vis spectroscopy. The photocatalytic activity was quantified by means of the bleaching of methylene blue. The films of the mixed ZnO-SnO₂ system show higher photocatalytic activity than the SnO₂ and ZnO films.