摘要
以L-半胱氨酸为稳定剂在水溶液中合成CdSe纳米粒子,研究了水浴时间、水浴温度、不同L-半胱氨酸/Cd/Se比例、pH值等因素对其荧光光谱的影响,确定了最佳的合成方案。用CdS对其表面进行修饰,采用透射电镜、X射线衍射、光谱法等表征了CdSe/CdS核壳结构颗粒的形成,结果表明该纳米粒子发光强度明显高于单一的CdSe量子点,光谱峰位置有所红移;合成条件会显著影响CdSe/CdS核壳结构量子点的荧光性能。
The water-soluble CdSe nanoparticles are synthesized using L-cysteine as stabilizer. Effects of the reaction temperature, reaction time, molar ratios of L-cysteine/Cd/Se and pH are investigated by fluorescence spectroscopy, and optimal synthesis scheme is established. CdS as a shell is used to modify the surface of CASe. The resultant CdSe/CdS core/shell nanoparticles are characterized by TEM, XRD and spectroscopy, respectively, and shown to have superior fluorescence properties with red shift of emission and absorption spectra in comparison with the CdSe plain core quantum dots. The preparation conditions have a strong influence on the photoluminescence of the CdSe/CAS core-shell quantum dots.
出处
《材料导报》
EI
CAS
CSCD
北大核心
2009年第10期83-86,97,共5页
Materials Reports
基金
国家高技术研究发展计划(863计划)项目(2007AA10Z182)
关键词
量子点
L-半胱氨酸
核壳结构
表面修饰
quantum dot, L-cysteine, core-shell structure, surface modification
