反相微乳液法制备CdS/ZnS纳米晶及其表征

人工晶体学报, 2006, 35(3): 588-593. doi: 10.3969/j.issn.1000-985X.2006.03.035

反相微乳液法制备CdS/ZnS纳米晶及其表征

聂波 ^1, , 张建成 ^2, , 沈悦 ^3, , 李思鑫 ^4, , 张金刚 ^5,

1.上海大学材料科学与工程学院,上海,200072

2.上海大学材料科学与工程学院,上海,200072

3.上海大学材料科学与工程学院,上海,200072

4.上海大学材料科学与工程学院,上海,200072

5.上海大学材料科学与工程学院,上海,200072

基金项目: 国家科技攻关计划(2003BA301A21) 国家自然科学基金(90206017)

关键词： CdS , ZnS , 核壳结构 , 纳米晶 , 反相微乳液

Preparation and Characterization of CdS/ZnS Nanocrystals in Microemulsions

用反相微乳液法制备了CdS纳米粒子,以ZnS对其表面进行包裹,得到了核壳结构的CdS/ZnS纳米晶.采用X射线衍射(XRD)、透射电镜(TEM)表征其结构、粒度和形貌,紫外-可见吸收光谱(UV-VIS)、光致发光光谱(PL)表征其光学特性.制得的CdS纳米微粒近似呈球形,直径约3.6nm;包裹以后颗粒仍为球形,粒径约10nm,以XRD、UV-VIS和PL证实了CdS/ZnS核壳结构的实现.文章还研究了不同Zn/Cd的摩尔比对CdS/ZnS纳米微粒光学性能的影响,UV-VIS谱表明随着壳层厚度的增加CdS/ZnS纳米晶的吸收带边有轻微的红移;PL谱表明壳层ZnS的包覆可减少CdS纳米微粒的表面缺陷,带边直接复合发光几率增大,且具有合适的壳层厚度时,CdS核层的发光效率有较大提高.

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