介观结构SiO_2/CdO纳米复合物为前驱体原位水热合成半导体CdSe和CdS纳米晶  

In situ Hydrothermal Synthesis of Semiconductor CdS and CdSe Nanocrystals by Using Mesostructured SiO_2/CdO Composites as Precursor

作　　者：杨海峰[1] 闫妍[1] 张福强[1] 陈颖[1] 屠波[1] 赵东元[1] 

机构地区：[1]复旦大学化学系,分子催化与先进材料实验室,上海200433

出　　处：《化学学报》2004年第21期2177-2181,共5页Acta Chimica Sinica

基　　金：国家自然科学基金(Nos.20101002;20373013);科技部973重大基础研究项目(No.2001CB610505);上海市纳米科技发展促进中心(0212nm043);复旦大学研究生创新基金资助项目.

摘　　要：以高度有序的介观结构SiO2/CdO纳米复合物为前驱体,在硒源或硫源存在的还原性条件下,利用原位水热反应,合成了介观结构SiO2/CdSe及SiO2/CdS纳米复合物,除去SiO2后,得到半导体CdSe及CdS纳米晶.通过X射线衍射(XRD),高分辨率透射电镜(HRTEM),X射线能散射谱(EDX)及选区电子衍射(SAED)等手段对产物进行了组成和结构表征.结果表明,介观结构SiO2主体材料在合成过程中起到了一定的形貌和尺寸限制作用,得到的CdSe和CdS均为直径在8nm左右的类球形六方相纳米晶.By using mesostructured SiO2/CdO composites as a precursor, uniform sphere-like CdSe and CdS nanocrystals have been synthesized under a reductive condition. In situ hydrothermal phase transition reactions of SiO2/CdO composites with non-metal S or Se were firstly employed. Components and structures of the final products were characterized with X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM), X-ray energy dispersive spectra and selected area electron diffraction (SAED). The results show that the mesostructured silica host provides a confinement effect on the size and morphology of the derived nanocrystals. Those CdSe and CdS nanoparticles are both 8 nm in diameter and highly crystallined with hexagonal lattices.

关 键 词：半导体 合成 介观结构 纳米晶 水热反应 SiO2/CdO纳米复合物 二氧化硅 氧化镉 CDSE CdS 硒化镉 硫化镉 

分 类 号：TN304[电子电信—物理电子学]