Sonoelectrochemical synthesis of highly photoelectrochemically active TiO2 nanotubes by incorporating CdS nanoparticles
Sonoelectrochemical synthesis of highly photoelectrochemically active TiO2 nanotubes by incorporating CdS nanoparticles
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DOI：
10.1088/0957-4484/20/29/295601
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发表时间：
2009-07
期刊：
影响因子：
3.5
通讯作者：
Chenglin Wang;Lan Sun;H. Yun;Jing Li;Y. Lai;Changjian Lin
中科院分区：
文献类型：
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作者：
Chenglin Wang;Lan Sun;H. Yun;Jing Li;Y. Lai;Changjian Lin
采用单步声电沉积的方法，以纳米硫化镉为基材，对自组织阳极二氧化钛纳米管阵列进行功能化处理。在二甲基亚砜(DMSO)中，即使控制在50℃，也能成功地合成出尺寸更小、分布更均匀的硫化镉纳米颗粒。此外，由于超声波的作用，二氧化钛纳米管可以填充纳米颗粒。掺入二氧化钛纳米管的硫化镉(CDS-TiO2 NTs)有效地捕获了紫外光和可见光(长达480 nm)区域的太阳光。与纯TiO_2纳米管相比，其光电流响应提高了9倍以上。最大入射光子载流子效率(IPCE)值分别为99.95%和9.85%。观察到CDS-TiO2纳米管的IPCE值高是由于电荷分离和电子输运效率的提高。提出了一个示意图，说明了在声化学和电化学条件下在纳米管中形成硫化镉的可能过程。
Self-organized anodic TiO2 nanotube arrays (TiO2NTs) are functionalized with CdS nanoparticle based perfusion and deposition through a single-step sonoelectrodeposition method. Even controlled at 50 °C, CdS nanoparticles with smaller size and more homogeneous distribution are successfully synthesized in dimethyl sulfoxide (DMSO) under ultrasonic irradiation. Moreover, TiO2 nanotubes can be filled with nanoparticles because of the ultrasonic effect. The CdS incorporated TiO2NTs (CdS–TiO2NTs) effectively harvest solar light in the UV as well as the visible light (up to 480 nm) region. Compared with pure TiO2NTs, a more than ninefold enhancement in photocurrent response is observed using the CdS–TiO2NTs. Maximum incident photon to charge carrier efficiency (IPCE) values of 99.95% and 9.85% are observed respectively for CdS–TiO2 nanotubes and pure TiO2NTs. The high value of IPCE observed with the CdS–TiO2NTs is attributed to the increased efficiency of charge separation and transport of electrons. A schematic diagram is proposed to illustrate the possible process of CdS formation in nanotubes under sonochemical and electrochemical conditions.