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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.
CdS / TiO2 nanotube composite thin films were prepared on indium tin oxide (ITO) conductive glass substrate by using ZnO nanorod arrays as templates.The scanning electron microscopy (SEM), X-ray diffraction (XRD), ultraviolet-visible absorption spectroscopy The effects of different deposition time of CdS on the morphology, crystal structure and optical and electrical properties of the composite films were investigated by UV-Vis and surface photovoltage spectroscopy (SPS). The results show that after deposition of 5 min CdS nanoparticles on the surface of TiO2 nanotube arrays, The surface photovoltage signal is enhanced and its absorption spectrum can be extended to the visible region. Corresponding to the absorption spectrum, a new photo-voltage spectrum response region appears in the visible region. This phenomenon indicates that CdS complex can significantly improve the TiO2 nanotube array With the increase of deposition time of CdS nanoparticles, the photo-voltage intensity of the composite nanotube array film in the visible region gradually weakened, and we have discussed and explained this phenomenon in detail with different charge transfer mechanisms. , We have also discussed in depth the influence of the specific surface area of the TiO2 nanotube array structure on the photoelectric characteristics of the composite structure.