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CdSe/TiO2纳米管阵列同轴异质结的制备及其光电特性研究

发表时间:2012-05-15  浏览量:1479  下载量:619
全部作者: 刘勇,朱文,马建
作者单位: 材料成形与模具技术国家重点实验室,华中科技大学材料科学与工程学院
摘 要: 研究TiO2纳米管阵列衬底上镉和硒的欠电位沉积(under-potential deposition,UPD)电化学行为。结合欠电位沉积技术和共沉积技术,优选出合适的沉积电位,以此为依据在高度规整有序的TiO2纳米管管壁上外延生长窄带隙化合物半导体CdSe. 场发射扫描电子显微镜(field emission scanning electron microscope,FESEM)、X射线衍射仪(X-ray diffractometer,XRD)、能量色散X射线谱(energy dispersive atomic X-ray,EDAX)、透射电镜(transmission electron microscope,TEM)表征结果综合表明:已成功地在纳米管外壁制备出具有准化学计量比的CdSe外延层,获得CdSe/TiO2纳米管阵列同轴异质结结构。对制备的CdSe/TiO2/Ti样品进行光电性能测试,结果表明:当沉积时间为7 h时制备得到的样品光电效率最高。同时,对比研究不同退火气氛对于样品光活性的影响,表明在氮气中退火能在TiO2晶格中引入氮离子,有利于光敏性的提高,但是提高幅度随着CdSe沉积时间增大而下降。
关 键 词: 低维无机非金属材料;电化学原子层外延;TiO2纳米管阵列;硒化镉;欠电位沉积;光电转化效率
Title: Synthesis and photoelectrochemical properties of CdSe/TiO2 nanotubes array coaxial heterojunction
Author: LIU Yong, ZHU Wen, MA Jian
Organization: State Key Laboratory of Materials Processing and Die & Mould Technology, College of Materials Science and Engineering, Huazhong University of Science & Technology
Abstract: The under-potential deposition (UPD) of Cd and Se elements on TiO2 nanotubes array substrate is studied. CdSe, a kind of narrowband gap semiconductor compound, is successfully deposited onto the walls of the highly structured and orderly TiO2 nanotubes array using a combination of UPD and co-deposition at a suitable potential. Field emission scanning electron microscope (FESEM), X-ray diffractometer (XRD), energy dispersive atomic X-ray (EDAX) and transmission electron microscope (TEM) analyses show that CdSe/TiO2 nanotubes array with coaxial heterojunction structure has been formed. The photoelectrochemical properties of the resulting films with the CdSe/TiO2 nanotube-array coaxial heterojunction are discussed. The results show that the maximum photoconversion efficiency can be obtained for the sample with the sensitization layer using the deposition time of 7 h. In addition, the effect of annealing atmosphere on the photoactivity of as-prepared samples also has been investigated. It suggests that the annealing in nitrogen atmosphere can introduce the N atoms to TiO2 lattice, to a certain extent, is conducive to the improvement of photoactivity, however, the efficacy tends to decline in the wake of the increasing deposition time.
Key words: low-dimensional inorganic non-metallic materials; electrochemical atomic layer epitaxy; TiO2 nanotube arrays; CdSe; under-potential deposition; photoconversion efficiency
发表期数: 2012年5月第9期
引用格式: 刘勇,朱文,马建. CdSe/TiO2纳米管阵列同轴异质结的制备及其光电特性研究[J]. 中国科技论文在线精品论文,2012,5(9):883-891.
 
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