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
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
复制标题
循环伏安电沉积在TiO2纳米管阵列上均匀沉积水溶性CdS量子点：有效防止聚集并增强可见光光催化活性
DOI：
10.1016/j.electacta.2013.06.107
复制
发表时间：
2013-10-01
影响因子：
6.6
通讯作者：
Li, Jianbao
中科院分区：
文献类型：
--
作者：
Zhang, Xiaojiao;Lin, Shiwei;Li, Jianbao
采用直流(DC)电沉积、循环伏安(CV)电沉积、连续离子层吸附反应(SILAR)等方法，在高度有序的二氧化钛纳米管阵列(TNTA)上制备了阳离子表面活性剂十六烷基三甲基溴化铵(CTAB)包覆的水溶性硫化镉量子点(QD)。形貌测量表明，CTAB封端能很好地控制量子点的大小，CV法能有效地阻止纳米粒子的聚集，使量子点均匀地沉积在TNTA上。在所研究的各种沉积方法中，循环伏安法制备的样品具有优异的光电性能和光催化活性。循环伏安电沉积法制备的CdS/TNTAs的最大光转化效率为2.81%，是直流电沉积样品的17倍。在可见光照射下对甲基橙的光催化降解实验表明，用循环伏安法制备的样品的速率常数几乎是未处理样品的7倍。并对其性能改善的机理进行了探讨。(C)2013爱思唯尔有限公司。保留所有权利。
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. (C) 2013 Elsevier Ltd. All rights reserved.