摘要
以巯基乙酸为稳定剂在水溶液中合成了水溶胶CdSe/CdS核/壳结构的量子点,利用X射线粉末衍射(XRD)和X射线光电子能谱(XPS)对量子点结构进行了表征;并对化学组成和尺寸分布进行了研究。通过紫外可见吸收光谱、激发光谱与发射光谱研究了它们的发光特性。
Water-sol core/shell CdSe/CdS quantum dots (QDs) were synthesized in aqueous solution by using mercapto-acetate acid as stabilizer. The UV-Vis absorption and emission spectra were studied. The size of the SdSe-core was about 2 nm estimated by absorption edge and X-ray powder diffraction(XRD). The structure was also characterized by X-ray photoelectron spectroscopy(XPS). The intensity of luminescence of the quantum dots was greatly enhanced after the surface was modified with US shell. Red shift of the peak was shown in both the emission and absorption spectra.
出处
《光谱学与光谱分析》
SCIE
EI
CAS
CSCD
北大核心
2005年第5期651-654,共4页
Spectroscopy and Spectral Analysis
基金
国家重点基础研究发展计划("973"计划)(2003CB314707)
国家自然科学基金(NSFC):(90301004
10434030
60406005)
北京市科技新星计划(2004B10)资助项目
