低温水热法制备ZnS:Co+Cr纳米晶及其光学性能研究  

Optical Properties of ZnS:Co+Cr Nanocrystals Synthesized by a Low Temperature Hydrothermal Process

作　　者：王孝笑 杨琳[1] 刘洪[1] 陈强[1] 肖定全[1] 朱建国[1] 

机构地区：[1]四川大学材料科学与工程学院,成都610064

出　　处：《无机材料学报》2014年第10期1049-1054,共6页Journal of Inorganic Materials

基　　金：国家自然科学基金重点项目(51332003)~~

摘　　要：采用低温水热法制备出3-巯基丙酸(MPA)修饰的ZnS:Co+Cr纳米晶.利用X射线衍射仪、粒度分析仪、透射电镜、紫外–可见分光光度计、荧光分光光度计和XPS能谱仪等对ZnS:Co+Cr纳米晶的结构、形貌、粒径分布和发光性能进行了表征.结果表明:合成的ZnS:Co+Cr纳米晶有较好的单分散性,平均粒径为9.3 nm,均为立方闪锌矿结构;ZnS:Co+Cr纳米晶的吸收边位于320 nm处,并在728 nm处出现Co2+的特征吸收峰;当Cr2+浓度为0.75at%,水热反应温度为160℃时,ZnS:Co+Cr纳米晶PL峰最强;XPS能谱表明Cr2+部分被氧化成Cr3+。Water-soluble ZnS：Co＋Cr nanocrystals（NCs） were synthesized by a low temperature hydrothermal process using 3-mercaptopropionic acid（MPA） as capping agent. X-ray diffraction, laser particle size analyzer, transmission electron microscope（TEM）, UV-Vis spectrophotometer, fluorescence spectrophotometer, XPS were used to characterized crystalline structure, morphology, particle size and optical properties of the samples. It is found that the ZnS：Co＋Cr NCs are monodisperse and show zinc blende structure with an average particle size of about 9.3 nm. The absorption edge of ZnS：Co＋Cr NCs is observed at 320 nm from the UV-Vis absorption spectra, furthermore the characteristic absorption peak at 728 nm of Co^2＋ is observed. The photoluminescence characteristics indicate that ZnS：Co＋Cr NCs shows the maximum PL intensity value under the condition： Cr-doping concentration of 0.75at% and the hydrothermal reaction temperature of 160℃. As confirmed by X-ray photoelectron spectroscope（XPS）, the Cr^2＋dopants are partialiy oxidized into Cr^3＋.

关 键 词：水热法 ZnS:Co+Cr纳米晶 物相结构 光学性能 

分 类 号：O614[理学—无机化学]