Department of Chemistry, Ferdowsi University of Mashhad, Mashhad, Iran.
Ultrason Sonochem. 2011 Mar;18(2):629-34. doi: 10.1016/j.ultsonch.2010.08.003. Epub 2010 Aug 10.
CdS nanoparticles were easily combined with TiO(2) through a reaction in micro-emulsion by means of ultrasonic irradiation. The formation of a uniform layer of TiO(2) on the CdS led to an increase of the size of nanoparticles. This is due to the appearance of a core-shell structure between the two combined semiconductors with a strong interface between them. TiO(2) shell depths were in the range of 1.4-2.3 nm. Nano-scale depths of TiO(2) layers on the CdS can be easily controlled by adjusting the concentration of TTIP (titanium tetra-isopropoxide). Important variables such as the preparation method, molar ratio of the reactants, and time of sonication were investigated. Ultrasonic irradiation can control the hydrolysis and condensation of TTIP and the formation of a gradient TiO(2) shell around the CdS core. The nanoparticles were characterized by X-ray diffraction (XRD), UV-visible spectroscopy, energy dispersed analysis of X-ray (EDAX), HRTEM, SEM, and surface area measurements (BET).
CdS 纳米粒子很容易通过超声辐射在微乳液中与 TiO(2) 反应结合。在 CdS 上形成一层均匀的 TiO(2) 导致纳米粒子的尺寸增加。这是由于两种结合半导体之间出现了核壳结构，它们之间具有很强的界面。TiO(2) 壳层的深度在 1.4-2.3nm 范围内。通过调整 TTIP（钛四异丙醇酯）的浓度，可以轻松控制 CdS 上 TiO(2) 层的纳米级深度。研究了重要的变量，如制备方法、反应物的摩尔比和超声时间。超声辐射可以控制 TTIP 的水解和缩合以及 CdS 核周围梯度 TiO(2) 壳的形成。通过 X 射线衍射（XRD）、紫外可见光谱、X 射线能量色散分析（EDAX）、高分辨率透射电子显微镜（HRTEM）、扫描电子显微镜（SEM）和比表面积测量（BET）对纳米粒子进行了表征。
