Uniform deposition of water-soluble CdS quantum dots on TiO₂ nanotube arrays by cyclic voltammetric electrodeposition: Effectively prevent aggregation and enhance visible-light photocatalytic activity

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• 作者：Xiaojiao Zhang ; Shiwei Lin ; Jianjun Liao ; Nengqian Pan ; Danhong Li ; Xiankun Cao ; Jianbao Li
• 关键词：TiO2 nanotube arrays ; CdS quantum dots ; Cyclic voltammetry ; Photoelectrical properties ; Photocatalytic activity
• 刊名：Electrochimica Acta
• 出版年：2013
• 出版时间：1 October, 2013
• 年：2013
• 卷：108
• 期：Complete
• 页码：296-303
• 全文大小：2919 K

文摘

Water-soluble CdS quantum dots (QDs) covered with cationic surfactant-cetyltrimethylammonium bromide (CTAB) were deposited on the highly ordered TiO₂ nanotube arrays (TNTAs) by various methods, such as direct current (DC) electrodeposition, cyclic voltammetric (CV) electrodeposition, and successive ionic layer adsorption reaction (SILAR). The morphology measurements show that CTAB capping could well control the QD size and the CV method could effectively prevent the nanoparticle aggregation and uniformly deposit QDs onto TNTAs. Among all the deposition methods studied, the sample prepared by the CV method possesses superior photoelectrical properties and photocatalytic activity. A maximum photoconversion efficiency of 2.81 % is achieved for the CdS/TNTAs prepared by CV electrodeposition, which exhibits about 17 times enhancement over the efficiency of the sample prepared by DC electrodeposition. And the photocatalytic degradation of methyl orange under visible-light irradiation demonstrates that the rate constant of the sample prepared by the CV method is almost seven times of that of the untreated TNTAs. Moreover, the underlying mechanism for the improving properties has been discussed.