模板法制备CdS/TiO_2纳米管复合阵列薄膜及其光电性质  

Template-based synthesis and photo-electric properties of CdS/TiO_2 nanotube array composite film

作　　者：付冬伟[1] 程轲[1] 袁占强[1] 庞山[1] 王广君[1] 李蕴才[1] 杜祖亮[1] 

机构地区：[1]河南大学特种功能材料教育部重点实验室,开封475004

出　　处：《科学通报》2011年第3期231-238,共8页Chinese Science Bulletin

基　　金：国家自然科学基金(10874040;20773103);教育部科技创新工程重大项目培育基金(708062)资助项目

摘　　要：采用ZnO纳米棒阵列为模板在氧化铟锡(ITO)导电玻璃衬底上制备了CdS/TiO2纳米管复合薄膜.利用扫描电子显微镜(SEM)、X射线衍射仪(XRD)、紫外-可见吸收分光光度计(UV-Vis)及表面光电压谱(SPS)研究了不同CdS沉积时间对复合薄膜的形貌、晶体结构、光电性质的影响.研究结果表明,TiO2纳米管阵列表面沉积5minCdS纳米颗粒后,其表面光电压信号得到增强,并且其吸收光谱可拓展到可见光区;与吸收光谱相对应,在可见光区出现新的光电压谱响应区,这一现象说明与CdS复合可显著提高TiO2纳米管阵列的光电特性;随着CdS纳米颗粒沉积时间的增加,复合纳米管阵列薄膜在可见光区域的光电压强度逐渐减弱,我们用不同的电荷转移机制对此现象进行了详细的讨论和解释.除此之外,我们对TiO2纳米管阵列结构的比表面积对复合结构的光电特性影响也做了深入的讨论.Well-aligned CdS/TiO2 nanotube array composite film was fabricated on the indium-doped tin oxide（ITO） substrate by templating ZnO nanorod array film.The effects of CdS deposition time on the morphology,crystal structure,photo-electric properties of TiO2/CdS composite film were investigated via scanning electron microscopy（SEM）,X-ray diffraction（XRD）,ultraviolet-visible absorption spectrum（UV-Vis） and surface photovoltage spectrum（SPS）.The results showed that the absorbance of composite film extended to the visible region compared with the pristine TiO2 nanotube arrays.The SPS also showed a new response region relative to the absorption spectrum.This result indicated a remarkable photo-electric conversion efficiency improvement in the visible region.We also found that the SPS response intensity of composite film decreased gradually in the visible region with the increase of CdS deposition time.We interpreted and discussed this phenomenon using distinct photo-induced charge generation and transfer mechanisms detailedly.Despite this,we also discussed the influence of surface-to-volume ratio on the final photo-electric properties for the CdS/TiO2 nanotube array composite film.

关 键 词：TiO2/CdS纳米管阵 列薄膜 模板法 表面光电压谱(SPS) 光电特性 电荷转移 

分 类 号：TB383.1[一般工业技术—材料科学与工程]