【摘要】 用水热微乳法制备了结晶性良好的CdS量子点,并通过连接分子巯基乙酸将CdS量子点自组装到多孔TiO2薄膜电极上。结果表明:CdS纳米颗粒的平均直径约为5 nm,小于其量子尺寸;微乳体系为化学反应提供了良好的微型反应器,抑制了CdS晶粒的长大,而水热过程增强了CdS纳米颗粒的结晶性;由于CdS的可见光响应作用和CdS量子点的量子效应,CdS量子点敏化TiO2薄膜电极样品具有比纯TiO2薄膜电极样品更高的可见光响应和光电流。讨论了CdS量子点通过连接分子组装到TiO2薄膜上的机理。更多还原

【Abstract】 The CdS quantum dots(QDs) material was prepared by a microemulsion-hydrothermal method.This material was self-assembled onto the porous TiO2 film electrode with the molecular linker mercaptoacetic acid.The results show that the average diameter of CdS nanoparticles is approximately 5 nm,which is below the quantum size of CdS.The current microemulsion system provided a micro-reactor for the reaction,inhibiting the growth of CdS crystallite.The hydrothermal process enhanced the crystalliza-tion of CdS nanoparticles.The porous TiO2 film sensitized by the self-assembled microemulsion-hydrothermal method with the CdS QDs material gave a higher photoresponse in the visible region and the corresponding film electrode exhibited a higher photocurrent than that of a pure TiO2 film electrode.This was ascribed to both the visible light response of CdS and the quantum effect of CdS QDs.The mechanism of CdS QDs self-assembling onto the porous TiO2 film electrode with the intermediate mercaptoacetic acid was also discussed.更多还原