Kinetically restraining aggregation of ZnS nanocrystals and the effect on photocatalysis

被引:15
作者
Feng, Shouai [1 ,2 ]
Zhao, Jianghong [1 ]
Zhu, Zhenping [1 ]
机构
[1] Chinese Acad Sci, Inst Coal Chem, State Key Lab Coal Convers, Taiyuan 030001, Peoples R China
[2] Chinese Acad Sci, Grad Univ, Beijing 100039, Peoples R China
来源
MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS | 2008年 / 150卷 / 02期
基金
中国国家自然科学基金;
关键词
ZnS nanocrystal; aggregation; stabilization; kinetics; photocatalysis;
D O I
10.1016/j.mseb.2008.02.002
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
A common problem in the fabrication of nanostructures is their undesired aggregation due to their high surface free energy. Here we show that a combinatorial control of reaction kinetic parameters such as feeding rate of reactant and reaction temperature can effectively restrain the aggregation of ZnS nanocrystals. The restraining process is associated with a stabilization of ZnS nanocrystal surfaces. Slowing down the feeding rate of reactants allows formed ZnS nanocrystals to get enough time to stabilize their surfaces. The stabilization of ZnS nanocrystal surfaces is further improved by suitably increasing reaction temperature. As a result, well dispersed and uniform ZnS nanocrystals with diameter of 4-6 nm are obtained with a common reaction between Zn(NO3)(2) and Na2S, which is normally viewed to easily cause an aggregation. The results of photocatalytic degradation of methylene blue show that the aggregation restraint can effectively improve the activity of ZnS nanocrystals. (C) 2008 Elsevier B.V. All rights reserved.
引用
收藏
页码:116 / 120
页数:5
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