半导体介晶综述

A survey on semiconductor mesocrystals

介晶是纳米晶粒通过有机物桥连、部分通过有机物或部分自身连接以及完全通过自身连接在一起形成具有介观尺寸（1~1 000 nm）的三维有序组装体,表现出类似单晶的衍射花样。为更好地利用介晶半导体材料,概述介晶半导体材料的生长机理,即粒子介导的形成过程;总结介晶半导体光催化材料Ti O2、Zn O、WO3、Bi2WO6、Cd S/Cd Se和Pb S等在能源和环境方面具有应用潜质的制备方法;结合介晶结构分析,讨论半导体材料中缺陷的检测方法及其分布,以及缺陷对光催化性能的影响;展望介晶半导体光催化材料的应用前景。

The mesocrystal is an ordered superstructure of crystals with mesoscopic size（ from 1 to 1 000 nm）. Often,the crystalline subunits are in perfect 3D mutual order via bridged organics and nanocrystals,showing an identical scattering pattern and behavior in polarized light to a single crystal. Herein,the formation mechanism of mesocrystals was discussed,which is a nanoparticle mediated process. The semiconductor mesocrystals,such as Ti O2,Zn O,WO3,Bi2WO6,Cd S/Cd Se and Pb S,were introduced as well. In addition,the methods for the detection of defects and their distribution,and the relationship between the defects and photocatalytic performance were illustrated explicitly. Finally,we gave a perspective for the applications of semiconductor mesocrystals,especially in energy conversion and environmental protection.