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Sonoelectrochemical synthesis of highly photoelectrochemically active TiO_2 nanotubes by incorporating CdS nanoparticles

机译：掺CdS纳米粒子声电化学合成高光电化学活性TiO_2纳米管

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摘要

Self-organized anodic TiO_2 nanotube arrays (TiO_2NTs) are functionalized with CdS nanoparticle based perfusion and deposition through a single-step sonoelectrodeposition method. Even controlled at 50℃, CdS nanoparticles with smaller size and more homogeneous distribution are successfully synthesized in dimethyl sulfoxide (DMSO) under ultrasonic irradiation. Moreover, TiO_2 nanotubes can be filled with nanoparticles because of the ultrasonic effect. The CdS incorporated TiO_2NTs (CdS—TiO_2NTs) effectively harvest solar light in the UV as well as the visible light (up to 480 nm) region. Compared with pure TiO_2NTs, a more than ninefold enhancement in photocurrent response is observed using the CdS—TiO_2NTs. Maximum incident photon to charge carrier efficiency (IPCE) values of 99.95% and 9.85% are observed respectively for CdS—TiO_2 nanotubes and pure TiO_2NTs. The high value of IPCE observed with the CdS—TiO_2NTs 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.
机译：自组织的阳极TiO_2纳米管阵列（TiO_2NTs）通过基于CdS纳米粒子的灌注和沉积通过单步声电沉积方法进行功能化。甚至控制在50℃，在超声辐照下，在二甲亚砜（DMSO）中成功合成了尺寸较小，分布更均匀的CdS纳米粒子。而且，由于超声作用，TiO_2纳米管可以被纳米粒子填充。掺入CdS的TiO_2NTs（CdS-TiO_2NTs）有效地收集了紫外线以及可见光（最大480 nm）区域的太阳光。与纯TiO_2NTs相比，使用CdS-TiO_2NTs可以观察到光电流响应提高了九倍以上。 CdS-TiO_2纳米管和纯TiO_2NTs的最大入射光子对电荷载流子效率（IPCE）值分别为99.95％和9.85％。用CdS-TiO_2NTs观察到的IPCE的高价值归因于电荷分离和电子传输效率的提高。提出了示意图以说明在声化学和电化学条件下在纳米管中CdS形成的可能过程。

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