pp. 437-442
S&M937 Research Paper of Special Issue https://doi.org/10.18494/SAM.2013.878 Published: August 26, 2013 Functionalized Mn2+-Doped Zinc Sulfide Quantum Dots as a Metal Ion Sensor for Industrial Wastes [PDF] Guo-Feng Chen, Hsiao-Pin Tsai, Ping-Shan Lai and Ming-Yuan Liao (Received November 5, 2012; Accepted February 4, 2013) Keywords: zinc sulfide, quantum dot, fluorescence probe
L-Cysteine-capped Mn2+-doped ZnS quantum dots are prepared as a fluorescence probe for the detection of heavy metal contaminants, such as As2O4 2−, Cd2+, CrO4 2−, Ni2+, Zn2+, Ca2+, Fe2+, Cu2+, Pb2+, Co2+, and Mn2+ ions. The results show that the l-cysteinecapped Mn2+-doped ZnS quantum dots exhibit good sensitivity and selectivity for the detection of copper ions. The optimized concentration of l-cysteine-capped Mn2+-doped ZnS quantum dots is determined as 2 mg/mL under pH 7.0 in phosphate buffer. The detection limit for this sensor system is 0.2 ppm with the linear range between 0.5 and 20 ppm. The effect of foreign ions such as Mn2+, Fe2+, Co2+, and Ni2+ on the detection of Cu2+ solution is also evaluated. The results show that there is no significant difference in the measurements.
Corresponding author: Ming-Yuan LiaoCite this article Guo-Feng Chen, Hsiao-Pin Tsai, Ping-Shan Lai and Ming-Yuan Liao, Functionalized Mn2+-Doped Zinc Sulfide Quantum Dots as a Metal Ion Sensor for Industrial Wastes, Sens. Mater., Vol. 25, No. 6, 2013, p. 437-442. |