Morphology and Band Gap Modulation of CdS Quantum Dots Deposited on Reoxidation TiO2 Nanotube Arrays

被引：7
作者：
Zhang, Miao [1 ,2 ]
Shi, Shiwei [1 ,2 ]
He, Gang [1 ,2 ]
Song, Xueping [1 ,2 ]
Sun, Zhaoqi [1 ,2 ]
机构：
[1] Anhui Univ, Sch Phys & Mat Sci, Hefei 230601, Peoples R China
[2] Anhui Univ, Anhui Key Lab Informat Mat & Devices, Hefei 230601, Peoples R China
来源：
SCIENCE OF ADVANCED MATERIALS | 2014年 / 6卷 / 01期
基金：
中国国家自然科学基金;
关键词：
TiO2 Nanotube Arrays; Reoxidation; Sequential Chemical Bath Deposition; CdS Quantum Dot; Optical Band Gap; Photocatalytic Properties; TITANIUM-DIOXIDE; CADMIUM-SULFIDE; ANODIZATION;
D O I：
10.1166/sam.2014.1697
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
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.
引用
收藏
页码：171 / 177
页数：7
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