个人信息Personal Information
教授
博士生导师
硕士生导师
性别:女
毕业院校:大连理工大学
学位:博士
所在单位:化工学院
学科:应用化学. 精细化工. 有机化学
办公地点:大连市高新区凌工路2号西部校区化工楼E434房间
联系方式:0411-84986265
电子邮箱:zhangshf@dlut.edu.cn
Impurity induced controlled growth of a NaGdF4 nanostructure by a core-shell approach
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论文类型:期刊论文
发表时间:2017-07-04
发表刊物:CRYSTENGCOMM
收录刊物:SCIE
卷号:19
期号:26
页面范围:3600-3606
ISSN号:1466-8033
摘要:Doping, incorporating appropriate and functional atoms or ions into host lattices of colloid nanoparticles, is an important approach to modifying the shapes and sizes of nanoparticles and endowing them with new and useful properties. Herein, we demonstrate a "core-shell" synthetic strategy to control the shape of core-shell structured NaGdF4 upconversion nanoparticles (UCNPs) by introducing an impurity dopant in the core region. We introduced Cr3+ ions in the core region of NaGdF4 to synthesize "Jasminum sambac flower" shaped non-classic core-shell NaGdF4:Cr3+@NaGdF4:Yb3+,Tm3+ UCNPs. First of all, the effect of doping concentration on the shape of NaGdF4 core was investigated. Then, the core-shell strategy was applied to obtain a shape-controlled hierarchical nanostructure, and the effects of Cr3+ concentration on the phases, shapes and sizes of the products were investigated in detail. TEM images indicate that NaGdF4:Cr3+@NaGdF4:Yb3+,Tm3+ nanocrystals with Cr3+ concentration of 40-50% show highly uniform "Jasminum sambac flower" shaped structures. TEM images and XRD patterns of NaGdF4:Cr3+@NaGdF4: Yb3+,Tm3+ at different reaction times indicate that, initially, the flower shaped products are cubic phase and the size of the flowers is about 50 nm; with an increase of the reaction time, the cubic phase nano crystals discompose to small ones and then transform to a bigger hexagonal phase "Jasminum sambac flower". This "core/shell" doping strategy presents a general route to achieving controlled morphology in lanthanide-doped nanocrystal systems.