N-油酰基吗啡啉体系中CdZnS三元量子点的合成——光谱性质及生长机理  

Synthesis of CdZnS alloyed quantum dots in N-oleoylmorpholine——spectral property and alloying mechanism

作　　者：傅凤鸣[1] 刘新梅[1] 黄文艺[1] 

机构地区：[1]广西科技大学生物与化学工程学院,广西柳州545006

出　　处：《广西科技大学学报》2014年第4期90-96,共7页Journal of Guangxi University of Science and Technology

基　　金：国家自然科学基金(No.21261003);广西教育厅重点科研基金(No.201202ZD069);广西自然科学基金(No.2013GXNSFAA019027);广西科技大学科研基金(No.12Z06)资助

摘　　要：以N-油酰基吗啡啉为溶剂,硬脂酸镉、硬脂酸锌和S粉为原料,采用高温热注射法合成了高质量的CdZnS量子点,用紫外-可见吸收光谱(UV-vis),荧光发射光谱(PL),高分辨透射电镜(HRTEM)和X射线粉末衍射仪(XRD)对量子点光谱性质、形貌、单分散性及物相结构进行了分析.结果表明,合成的CdZnS量子点为内富Cd外富Zn的组分梯度结构,改变原料中n(Zn):n(Cd)或n(Zn+Cd):n(S)比可在较大波长范围内调节其吸收光谱,往反应体系中添加不同长链基团可实现更宽范围的光谱调节.High quality ternary CdZnS alloyed quantum dots （QDs） were synthesized via a hot-injection method, in which N- oleoylmorpholine was used as solvent, S powder, cadmium stearate （Cd （St）2）, and zinc stearate （Zn （St） 2） as precursors. The spectral properties, morphology, monodispersity, and structure of the as-prepared CdZnS alloyed QDs were characterized by UV-vis absorption spectra, photoluminescence （PL） emission spectra, X-ray diffraction （XtlD）, transmission electron microscopy （TEM）, and high resolution TEM （HRTEM）. The results show that the as-prepared CdZnS alloyed QDs have a gradient structure with a Cd-rich inner core and Zn-rich outer shell. The wavelength range of absorption spectra can be tuned by changing the feed Cd-Zn-S stoichiometry. The addition of long-chain groups can extend the tunable range of absorption spectra of CdZnS alloyed QDs.

关 键 词：CdZnS 合金化机理:量子点:光谱性质 

分 类 号：O643[理学—物理化学]