您的位置：首页 > 论文页面
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：1911 下载量：762
| 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. |
0
评论数 0请您登录
暂无评论
下载全文
多维论文