水热法制备TiO_2-ZnO纳米棒分级结构及其光电性能研究  

Photoelectrochemical properties of the TiO_2-ZnO nanorod hierarchical structure prepared by hydrothermal process

作　　者：孙宝[1] 张赛 杜静文 郝彦忠[1,2] 裴娟[1] 李英品[1] 

机构地区：[1]河北科技大学理学院,河北石家庄050018 [2]河北科技大学化学与制药工程学院,河北石家庄050018

出　　处：《河北科技大学学报》2018年第1期65-72,共8页Journal of Hebei University of Science and Technology

基　　金：国家自然科学基金(21173065;21603053);河北省自然科学基金(B2014208062;B2014208066);河北省科技计划项目(13214413);河北科技大学博士科研基金(000691;010087)

摘　　要：为了增加光电极光生电子传输通道并提高其光敏剂的负载能力,采用两步水热法制备了一种新颖的TiO_2-ZnO纳米棒分级结构。采用水热法在FTO导电玻璃基底上生长TiO_2纳米棒有序阵列膜,通过浸泡提拉在TiO_2纳米棒上包覆一层ZnO溶胶,经烧结形成ZnO种子层;再次采用水热法于TiO_2纳米棒上生长ZnO纳米棒,形成TiO_2-ZnO纳米棒分级结构,通过旋涂辅助连续离子反应分别在TiO_2纳米棒阵列和TiO_2-ZnO纳米棒分级结构中沉积光敏剂CdS纳米晶,形成CdS/TiO_2纳米棒复合膜和CdS/TiO_2-ZnO纳米分级结构复合膜。利用SEM,TEM,XRD、紫外-可见吸收光谱、瞬态光电流图谱等表征和测试手段,对样品的形貌、结构、光吸收和光电性能进行了表征和测试。结果表明,与单纯的TiO_2纳米棒阵列相比,TiO_2-ZnO分级结构可以沉积更多的CdS光敏剂,CdS/TiO_2-ZnO纳米分级结构复合膜的光吸收性能和瞬态光电流均明显优于CdS/TiO_2纳米复合薄膜。凭借优异的光电性能,TiO_2-ZnO分级结构在太阳电池光阳极材料中具有很好的应用前景。In order to increase the transport channels of the photogenerated electrons and enhance the photosensitizer loading ability of the electrode,a new TiO_2-ZnO nanorod hierarchical structure is prepared through two-step hydrothermal process.First,TiO_2 nanorod array is grown on the FTO conductive glass substrate by hydrothermal proess.Then,ZnO sol is coated onto the TiO_2 nanorods through dip-coating method and inverted to ZnO seed layer by sintering.Finally,the secondary ZnO nanorods are grown onto the TiO_2 nanorods by the sencond hydrothermal method to form the designed TiO_2-ZnO nanorod hierarchical structure.A spin-coating assisted successive ionic layer reaction method(SC-SILR)is used to deposit the CdS nanocrystals into the TiO_2 nanorod array and the TiO_2-ZnO nanorod hierarchical structure is used to form the CdS/TiO_2 and CdS/TiO_2-ZnO nanocomposite films.Different methods,such as SEM,TEM,XRD,UV-Vis and transient photocurrent,are employed to characterize and measure the morphologies,structures,light absorption and photoelectric conversion performance of all the samples,respectively.The results indicate that,compared with the pure TiO_2 nanorod array,the TiO_2-ZnO nanorod hierarchical structure can load more CdS photosensitizer.The light absorption properties and transient photocurrent performance of the CdS/TiO_2-ZnO nanorod hierarchical structure composite film are evidently superior to that of the CdS/TiO_2 nanocomposite films.The excellent photoelctrochemical performance of theTiO_2-ZnO hierarchical structure reveales its application prospect in photoanode material of the solar cells.

关 键 词：电化学 水热法 TiO2-ZnO纳米棒分级结构 CDS纳米晶 光电性能 

分 类 号：O646[理学—物理化学]