title: Capability of coupled CdSe/TiO2 heterogeneous structure for photocatalytic degradation and photoconductivity.
abstract: Highly ordered TiO2 nanotube arrays (TiO2-NTAs), with a uniform tube size on titanium substrate, were obtained by means of reoxidation and annealing. A composite structure, CdSe quantum dots@TiO2 nanotube arrays (CdSe QDs@TiO2-NTAs), was fabricated by assembling CdSe quantum dots into TiO2-NTAs via cyclic voltammetry electrochemical deposition. The X-ray diffractometer (XRD), field-emission scanning electron microscope (SEM), and transmission electron microscope (TEM) were carried out for the determination of the composition and structure of the tubular layers. Optical properties were investigated by ultraviolet-visible spectrophotometer (UV-Vis). Photocurrent response under visible light illumination and photocatalytic activity of samples by degradation of methyl orange were measured. The results demonstrated that the photo absorption of the composite film shifted to the visible region, and the photocurrent intensity was greatly enhanced due to the assembly of CdSe QDs. Especially, photocurrent achieved a maximum of 1.853 μA/cm(2) after five voltammetry cycles of all samples. After irradiation under ultra violet-visible light for 2 h, the degradation rate of composition to methyl orange (MO) reached 88.20%, demonstrating that the CdSe QDs@TiO2-NTAs exhibited higher photocatalytic activity.
authors.affiliation: School of Physics and Material Science, Anhui University, 111 Jiulong Rd., Hefei 230601, Peoples' Republic of China.
authors.forename: Miao
authors.initials: M
authors.lastname: Zhang
authors.affiliation: School of Physics and Material Science, Anhui University, 111 Jiulong Rd., Hefei 230601, Peoples' Republic of China.
authors.forename: Yanyan
authors.initials: Y
authors.lastname: Xu
authors.affiliation: School of Electronic and Information Engineering, Hefei Normal University, 373 Huangshan Rd., Hefei 230601, Peoples' Republic of China.
authors.forename: Jianguo
authors.initials: J
authors.lastname: Lv
authors.affiliation: School of Physics and Material Science, Anhui University, 111 Jiulong Rd., Hefei 230601, Peoples' Republic of China ; Army Officer Academy, 451 Huangshan Rd., Hefei 230031, Peoples' Republic of China.
authors.forename: Lei
authors.initials: L
authors.lastname: Yang
authors.affiliation: School of Physics and Material Science, Anhui University, 111 Jiulong Rd., Hefei 230601, Peoples' Republic of China ; School of Electronic and Electrical Engineering, Chuzhou University, 1528 Fengle Rd., Chuzhou 239000, Peoples' Republic of China.
authors.forename: Xishun
authors.initials: X
authors.lastname: Jiang
authors.affiliation: School of Physics and Material Science, Anhui University, 111 Jiulong Rd., Hefei 230601, Peoples' Republic of China.
authors.forename: Gang
authors.initials: G
authors.lastname: He
authors.affiliation: School of Physics and Material Science, Anhui University, 111 Jiulong Rd., Hefei 230601, Peoples' Republic of China.
authors.forename: Xueping
authors.initials: X
authors.lastname: Song
authors.affiliation: School of Physics and Material Science, Anhui University, 111 Jiulong Rd., Hefei 230601, Peoples' Republic of China.
authors.forename: Zhaoqi
authors.initials: Z
authors.lastname: Sun
keywords: CdSe quantum dots; Cyclic voltammetry; Photocatalysis; TiO2 nanotubes