Department of Advanced Interdisciplinary Sciences, Graduate School of Engineering, Utsunomiya University, Yoto 7-1-2, Utsunomiya 321-8585, Japan.
Ultrason Sonochem. 2012 Jul;19(4):750-5. doi: 10.1016/j.ultsonch.2011.12.011. Epub 2011 Dec 28.
In this paper, we report the synthesis of silica coated ZnO nanoparticles by ultrasound irradiation of a mixture of dispersion of ZnO, tetraethoxysilane (TEOS), and ammonia in an ethanol-water solution medium. The silica coating layer formed at the initial TEOS/ZnO loading of 0.8 for 60 min ultrasonic irradiation was uniform and extended up to 3 nm from the ZnO surface as revealed from HR-TEM images. Silica coated ZnO nanoparticles demonstrated a significant inhibition of photocatalytic activity against photodegradation of methylene blue dye in aqueous solution. The effects of silica coating on the UV blocking property of ZnO nanoparticles were also studied.
在本文中，我们通过超声辐照分散在乙醇-水溶液介质中的 ZnO、四乙氧基硅烷（TEOS）和氨的混合物，报告了二氧化硅包覆氧化锌纳米粒子的合成。从高分辨率透射电子显微镜（HR-TEM）图像可以看出，在初始 TEOS/ZnO 负载为 0.8 并进行 60 分钟超声辐照的情况下，形成的二氧化硅包覆层均匀，从 ZnO 表面延伸至 3nm。二氧化硅包覆的氧化锌纳米粒子在光降解水溶液中甲基蓝染料的光催化活性方面表现出显著的抑制作用。还研究了二氧化硅包覆对 ZnO 纳米粒子的紫外屏蔽性能的影响。
