Journal
SCIENCE OF ADVANCED MATERIALS
Volume 6, Issue 1, Pages 171-177Publisher
AMER SCIENTIFIC PUBLISHERS
DOI: 10.1166/sam.2014.1697
Keywords
TiO2 Nanotube Arrays; Reoxidation; Sequential Chemical Bath Deposition; CdS Quantum Dot; Optical Band Gap; Photocatalytic Properties
Funding
- National Natural Science Foundation of China [51072001, 51272001]
- National Science Research Foundation for Scholars Return from Overseas of Chinese Ministry of Education, State Key Development Program of Basic Research of China [2013CB632705]
- Provincial Natural Science Foundation of Anhui Higher Education Institution of China [KJ2012A023]
- Key Project of Chinese Ministry of Education [212082]
- Outstanding Young Scientific Foundation of Anhui University [KJJQ1103]
- 211 project of Anhui University
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Highly ordered TiO2 nanotube arrays (TiO2-NTAs), with uniform tube size around 100 nm in diameter and 10 mu m in length, were obtained by means of reoxidation and annealing processes. CdS quantum dots (QDs) were assembled onto the TiO2-NTAs by sequential chemical bath deposition (SCBD). The composition, microstructure, optical and photocatalytic properties of the CdS QDs sensitized TiO2-NTAs were investigated in detail. Compared with the one step oxidation, reoxidation is beneficial to the improvement of morphology of TiO2-NTAs. As the SCBD cycles increase, the band gap of CdS QDs sensitized TiO2-NTAs shifts from 3.09 eV (bare TiO2-NTAs) to 2.81 eV (CdS QDs sensitized TiO2-NTAs with five SCBD cycles). CdS QDs sensitized TiO2-NTAs deposited with five SCBD cycles show the best uniformity of size, space distribution and highest absorbance, and show higher photocatalytic effect comparing with pure TiO2-NTAs under UV-light irradiation.
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