纳米碲化镉/石墨烯水溶液的制备及荧光性能研究

Study on the Preparation and the Fluorescence Performances of the Nano CdTe/Graphene Aqueous Solution

以石墨为原料,通过热还原法制备了还原性氧化石墨烯(rGO),然后采用水热法将CdTe量子点与rGO以非共价键的方式复合在一起,制备出了纳米CdTe/rGO水溶液。通过X射线衍射仪、紫外-可见分光光度计、透射电子显微镜和荧光分光光度计对样品进行了表征。结果发现,160℃下水热30min制备的CdTe/rGO荧光性能最好。CdTe量子点均匀地负载在rGO表面;CdTe量子点的团聚体尺寸由复合前的220nm减小到60nm^120nm;并在527nm处产生荧光猝灭,说明rGO与CdTe量子点之间存在着光诱导电子转移,从而为制备性能可靠的光伏器件提供可能。

The reduced graphene oxide（rGO） was firstly prepared by the thermally reduced method from graphite. Then,the nano CdTe/rGO linked by noncovalent bonds was prepared by hydrothermal method. The composites were characterized by XRD,UV-vis,TEM and fluorescence spectra. The obtained results showed the fluorescence performances were best for CdTe/rGO prepared at 160℃ for 30 min. The CdTe quantum dots were homogeneously distributed on the surface of rGO. After composited with rGO,the clustering size of CdTe quantum dots was decreased from 220 nm to 60 nm - 120 nm. In addition,the fluorescence strength of CdTe quantum dots at 527 nm was greatly annihilated after incorporation with rGO,which showed the presence of strong photoinduced electtron transfer between CdTe and rGO. Thus,the obtained CdTe/rGO composites may pave a road to gain reliable performance of photovoltaic devices.