Synthesis and Characterization of L-cysteine-modified ZnSe:Co/ZnSe Quantum Dots

2nd International Conference on Materials Science, Energy Technology and Environmental Engineering

材料科学;能源学;生态环境科学

Huang, Tao^1 ; Fang, Xiuting^1 ; Chen, Peifeng^1 ; Qiu, Chunhong^1 ; Huang, Fenghua^1

College of Chemistry and Chemical Engineering, Fujian Normal University, Fuzhou

350007, China^1

关键词: Aqueous phase;    Fluorescence quantum yield;    Fluorescent characteristic;    Infrared spectrum;    Photoluminescence emission;    Photoluminescence spectrum;    Sphalerite structure;    Synthesis and characterizations;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/81/1/012014/pdf
DOI  :  10.1088/1755-1315/81/1/012014

来源: IOP

【 摘 要 】

In this paper, ZnSe:Co/ZnSe QDs were synthesized by co-precipitation technique in aqueous phase using L-cysteine as modifier, the experimental results were characterized by X-ray power diffraction(XRD), transmission electron microscope(TEM), infrared spectrum(IR)and photoluminescence spectrum(PL). The results showed that the ZnSe:Co/ZnSe QDs was spherical with diameter around 3.2nm, belonged to cubic sphalerite structure and had good fluorescent characteristics. The photoluminescence emission intensity of the L-cysteine modified ZnSe:Co/ZnSe core/shell QDs was enhanced by doping Co2+ and coating ZnSe shell to the core ZnSe. After doped with Co2+ and coated with ZnSe shell, the fluorescence quantum yields of the as-prepared ZnSe:Co/ZnSe QDs increased from 4.93% to 29.94%. The L-cysteine modified on the surface of ZnSe:Co/ZnSe renders the QDs water-soluble and biocompatible.