一种高效、灵敏测定汞离子磷光量子点传感器

An Efficient and Sensitive Sensor of Phosphorescence Quantum Dots for Determining Hg²⁺

摘要: 以D-苯丙氨酸为稳定剂，合成具有室温磷光(RTP)的水溶性的Mn掺杂ZnS量子点。利用荧光分光光度计，扫描电子显微镜对合成的锰掺杂硫化锌量子点进行了表征。详细讨论了Hg²⁺浓度、酸碱度、温度等因素对传感器的影响。结果表明Hg²⁺的浓度在：1.0 × 10⁻⁵ mol/L~8.0 × 10⁻⁷ mol/L时呈现良好的线性关系，以此建立了测定Hg²⁺的新方法,该传感器对Hg²⁺显示出较好的识别能力,检出限为：2.6 × 10⁻⁸ mol/L相对标准偏差为3.30%。该法用于测定池塘水中Hg²⁺浓度可以得到较为满意的结果。

Abstract: The novel Mn-doped ZnS quantum dots of phosphorescence were synthesized in aqueous solution with D-phenylalanine as a stabilizer, which was characterized by fluorescence spectrometry and SEM, respectively. Effects of various factors including the concentration, temperature and pH of quantum dots on sensor were discussed. The results showed that the concentration of Hg²⁺ in the range of 1.0 × 10⁻⁵ mol/L to 8.0 × 10⁻⁷ mol/L had good linear relationship, a new method of the determination Hg²⁺ the sensor had good recognition ability for Hg²⁺, the detection limit was 2.6 × 10⁻⁸ mol/L, and the relative standard deviation was 3.30%. The method can be used to determine Hg²⁺ in pond water.