How CdS nanoparticles can influence TiO2 nanotube arrays in solar energy applications?

被引：60
作者：
Qorbani, M. [1 ]
Naseri, N. [1 ]
Moradlou, O. [2 ]
Azimirad, R. [3 ]
Moshfegh, A. Z. [1 ,4 ]
机构：
[1] Sharif Univ Technol, Dept Phys, Tehran, Iran
[2] Alzahra Univ, Fac Sci, Dept Chem, Tehran, Iran
[3] Malek Ashtar Univ Technol, Tehran, Iran
[4] Sharif Univ Technol, Inst Nanosci & Nanotechnol, Tehran, Iran
来源：
APPLIED CATALYSIS B-ENVIRONMENTAL | 2015年 / 162卷
关键词：
TNA; Cadmium sulfide; Redox reactions; Visible light; CHEMICAL BATH DEPOSITION; DOPED TIO2; QUANTUM DOTS; WATER; PHOTOCATALYSIS; ANODIZATION; PHOTOANODES; FABRICATION; ELECTRODE; CELLS;
D O I：
10.1016/j.apcatb.2014.06.053
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
In this study, titanium dioxide (TiO2) nanotube array (TNA) films are fabricated via anodization of titanium (Ti) sheet. After annealing, the films consisted of well ordered, vertically oriented TNAs of 125 +/- 6 nm diameter, 38 +/- 3 nm wall thickness, and 2.9 +/- 0.3 mu m in length. Cadmium sulfide (CdS) nanoparticles are deposited on the synthesized TNAs by sequential-chemical bath deposition (S-CBD) method with different immersion cycle (n) to produce heterogeneous TNA/CdS-n (n=10, 20 and 30) nanostructures. UV visible absorption spectra of the samples revealed that the absorption edge of CdS modified TNAs was shifted to a higher wavelength with respect to the pure TNAs indicating band gap reduction of the TNA/CdS-n. Photocurrent response of the samples was changed with n, and the maximum photocurrent density (at steady state) of 28 +/- 1 mA/cm(2) (or 70 +/- 2 mA/W) was obtained for the TNA/CdS-20 photoanode which is about 30 times higher than one for the pure TNA under similar condition. (C) 2014 Elsevier B.V. All rights reserved.
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页码：210 / 216
页数：7
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