Wang Nai-Xin, Wang Yan-Qin, He Xi-Wen, Li Wen-You
Department of Chemistry, Nankai University, Tianjin 300071, People's Republic of China.
J Nanosci Nanotechnol. 2011 May;11(5):4039-45. doi: 10.1166/jnn.2011.3878.
ZnCdS quantum dots have been successfully prepared at room temperature in aqueous solution with sodium hexametaphosphate as stabilizer and thioacetamide as the source of S. The photoluminescence (PL) spectra and UV-Vis absorption spectra of the ZnCdS quantum dots were determined on the basis of the initial Cd/Zn mole ratio (Cd/Zn = 8/0, 7/1, 6/2, 5/3, 4/4, 3/5, 2/6, 1/7 and 0/8) and the concentration of thioacetamide. The emission peaks first showed a red shift and then a blue shift with the increasing initial Zn concentration, which provided the evidence of formation of CdS/ZnCdS core/shell and ZnCdS alloyed quantum dots. The ZnCdS quantum dots were compared with CdS (ZnS) quantum dots doped with Zn2+ (Cd2+). The samples have also been characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM) and X-ray photoelectron spectra (XPS).
以六偏磷酸钠为稳定剂、硫代乙酰胺为硫源，在室温下于水溶液中成功制备了ZnCdS量子点。基于初始Cd/Zn摩尔比（Cd/Zn = 8/0、7/1、6/2、5/3、4/4、3/5、2/6、1/7和0/8）以及硫代乙酰胺的浓度，测定了ZnCdS量子点的光致发光（PL）光谱和紫外可见吸收光谱。随着初始Zn浓度的增加，发射峰先出现红移，然后出现蓝移，这为CdS/ZnCdS核壳结构和ZnCdS合金量子点的形成提供了证据。将ZnCdS量子点与掺杂Zn2+（Cd2+）的CdS（ZnS）量子点进行了比较。还通过X射线衍射（XRD）、透射电子显微镜（TEM）和X射线光电子能谱（XPS）对样品进行了表征。
