关键词:  CdTe量子点； , 荧光光谱； 银掺杂； 石墨烯

Abstract: Silver doped graphene/CdTe quantum dot composites were prepared by using mercaptopropionic acid and mercaptographene as stabilizers in aqueous phase under the protection of nitrogen. The fluorescence emission spectra show that after doping silver ions,  the maximum fluorescence wavelength of the graphene/CdTe quantum dot composites  significantly red-shifts, and increases with the increasing of heating time until equilibrium, which conforms to the law of   the second-order reaction kinetic adsorption model. The maximum fluorescence emission wavelengths can be calculated as 684.93,735.29,746.27 nm by using the second-order kinetic adsorption model  when the initial mass concentrations of silver ions are  18.75,37.50,56.25 mg/mL. Therefore,  the greater the initial mass concentration of silver ions,  the greater the  maximum fluorescence emission wavelength after reaching equilibrium, but the   maximum fluorescence emission intensity  decreases in turn. In order to obtain quantum dots with  large fluorescence emission wavelength and moderate fluorescence emission intensity,  the optimal amount of silver ions  is 37.5 mg/mL.

Key words: CdTe quantum dot; , fluorescence spectrum; , Ag dopted; , graphene