中文摘要：

以巯基丙酸（MPA）为稳定剂,在水相中制备高荧光强度的CdTe 量子点（CdTe QDs）,再以硫化钠和硫酸锌分别为硫源和锌源对其进行包裹得到CdTe@ZnS 量子点,研究了回流时间和pH 值对量子点荧光强度的影响. 采用改进的Hummers 法制备了氧化石墨,再以水合肼作为还原剂,加入聚二烯二甲基氯化铵（PDDA）,制得PDDA 功能化的石墨烯. 利用静电力将量子点和功能化的石墨烯连接在-起得到CdTe@ZnS QDs-PDDA 功能化石墨烯复合材料. 采用紫外光谱、荧光光谱、透射电镜（TEM）、扫描电镜（SEM）和X 射线衍射（XRD）对复合材料的结构进行了表征.结果表明：在pH = 9、回流时间为140 min 条件下,CdTe@ZnS 量子点的荧光强度最大; CdTe@ZnS 量子点均匀负载在PDDA 功能化石墨烯的表面.

英文摘要：

The high fluorescence intensity of CdTe quantum dots were synthesized using mercaptopropionic acid (MPA) as the stabilizer. NaS and ZnSO4 were taken as the source of sulfur and zinc to prepare CdTe@ZnS QDs. Then the flu-orescence intensity of CdTe@ZnS QDs were researched by changing the reaction time and pH. In addition , the graphene oxide was prepared by modified Hummers method, and using hydrazine hydrate as reducing agent to produce PDDA functionalization graphene. CdTe@ZnS QDs-RGO composite materials were synthesized by CdTe@ZnS QDs and PDDA-graphene through static electricity. The composite materials were characterized by UV-visible absorption spectrum, fluorescence emission spectrum, transmission electron microscope (TEM), scanning electron microscope (SEM) and X-ray diffraction (XRD). The results show that the optimum reaction conditions of CdTe@ZnS QDs is pH=9 and reaction time is 140 min;CdTe@ZnS QDs are evenly loading on the surface of PDDA-graphene.