Detection of lead Using Thioglycolic Acid Capped ZnSe and ZnSe@ZnS core-shell Quantum Dots

2nd International Symposium on Application of Materials Science and Energy Materials

材料科学;能源学

Ahmad Mir, Irshad^1 ; Lu, Qixiao^1 ; Xie, Yuelin^1 ; Zhu, Ling^1 ; Wang, Xinzhong^2

Shenzhen Key Laboratory of Flexible Memory Materials and Devices, College of Electronic Science and Technology, Shenzhen University, Nanhai Ave. 3688, Shenzhen, Guangdong

518060, China^1

School of Electronic Communication and Technology, Shenzhen Institute of Information Technology, Shenzhen

518172, China^2

关键词: Concentration quantification;    Core-shell quantum dots;    Fluorescence quenching measurement;    Linearity range;    Selective sensors;    Spectroscopic detection;    Thioglycolic acid;    Toxic metal ions;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/490/2/022024/pdf
DOI  :  10.1088/1757-899X/490/2/022024

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

Herein, we proffer a sensitive and selective sensor using ZnSe and ZnSe@ZnS quantum dots (QDs), for detection of toxic metal ions at nm level. It has been found that the TGA capped ZnSe and ZnSe@ZnS QDs were apparently sensitive to Pb2+ ions as perceptible from their fluorescence quenching measurements. However, in case of few common heavy metal ions such as Zn2+, Co2+, Fe2+, Mg2+, Cu2+, Ni2+ and Cd2+ ions, negligible quenching compared to Pb2+ ions was noted. Hence, we have successfully detected Pb2+ ions in aqueous solutions based on the photoluminescence (PL) spectroscopy. The observed linearity range was from 10 NM to 100 nM for both Pb2+ ions. An alternative QD based sensor for the spectroscopic detection, and concentration quantification of Pb2+ ions is proposed.