Abstract：
Mercury (Hg), a notorious heavy metal with detrimental impacts on human health and the environment, necessitates the development of precise measurement methods. This study introduces an expeditious and straightforward photochemical approach to synthesize thioglycolic acid (TGA)-stabilized CdTe/CdS/ZnS core/multi-shell quantum dots (QDs). The synthesized CdTe/CdS/ZnS QDs were comprehensively characterized using fluorescence spectroscopy, transmission electron microscopy (TEM), energy-dispersive X-ray spectroscopy (EDS), Field Emission Scanning Electron Microscopy (FESEM), and X-Ray diffraction (XRD). XRD and EDS results confirmed the successful formation of CdTe/CdS/ZnS structure. Also, FESEM and TEM results showed that CdTe/CdS/ZnS QDs were spherical. Results showed that synthesized Exhibiting vibrant green fluorescence and notable quenching in the presence of Hg2+ ions, these QDs emerge as promising candidates for fabricating a fluorescent sensor. The proposed sensor demonstrates notable sensitivity to Hg2+, featuring a detection limit of 16.32 nM and a linear range from 20 nM to 70 nM. The sensor\'s selectivity was confirmed by analyzing various anions and cations. Moreover, when tested with tap water, river water, and agricultural samples, the sensor exhibited reliable performance, validated by Inductively Coupled Plasma (ICP) analysis. Additionally, CdTe/CdS/ZnS QDs immobilized on micro pads proved effective for on-site water sample analysis, presenting a versatile solution for environmental monitoring.
摘要：
汞(Hg),一种臭名昭著的重金属，对人类健康和环境有有害影响，需要发展精确的测量方法。这项研究介绍了一种快速，直接的光化学方法来合成巯基乙酸（TGA）稳定的CdTe/CdS/ZnS核/多壳量子点（QD）。利用荧光光谱对合成的CdTe/CdS/ZnS量子点进行了全面表征,透射电子显微镜（TEM），能量色散X射线光谱（EDS），场发射扫描电子显微镜(FESEM),和X射线衍射(XRD)。XRD和EDS结果证实成功形成了CdTe/CdS/ZnS结构。此外，FESEM和TEM结果表明CdTe/CdS/ZnS量子点呈球形。结果表明，在Hg2+离子的存在下，合成的显示出充满活力的绿色荧光和显著的猝灭，这些QD成为制造荧光传感器的有希望的候选者。所提出的传感器对Hg2+表现出显著的灵敏度，检测限为16.32nM，线性范围为20nM至70nM。通过分析各种阴离子和阳离子证实了传感器的选择性。此外，当用自来水测试时，河水,和农业样本，传感器表现出可靠的性能，通过电感耦合等离子体(ICP)分析验证。此外,固定在微垫上的CdTe/CdS/ZnS量子点被证明对现场水样分析有效，为环境监测提供了一个通用的解决方案。
