Department of Physics, Yunnan University, 650091, Kunming, People's Republic of China.
Key Lab of Quantum Information of Yunnan Province, Yunnan University, 650091, Kunming, People's Republic of China.
Sci Rep. 2018 Jun 12;8(1):8953. doi: 10.1038/s41598-018-27244-0.
Highly luminescent CdS quantum dots capped with thioglycolic acid (TGA@CdS QDs) were synthesized from cadmium chloride and thiourea as cadmium and sulfur sources via simple hydrothermal method. The room temperature photoluminescence (RTPL) properties of TGA@CdS QDs were investigated. The results indicate that the polarity of the solvent and the surface trap state resulted in the broadness Stokes shift between the maximum absorption wavelength and the emission wavelength of TGA@CdS QDs. The Co sensing properties of fluorescence determination were investigated using TGA@CdS QDs. The as-synthesized CdS QDs exhibits the excellent selectivity and sensitivity of fluorescence quenching for cobalt ion (Co). The limit of detection (LOD) is as low as 0.05 μM which is much lower than maximum limit of cobalt ions in drinking water. The linear response range of Co was from 0.5 to 80 μM. The sensing system revealed the advantages of low detection limit, excellent selectivity, high sensitivity, convenience and low cost. The color change of CdS QDs shows potential applications in the detection of Co.
巯基乙酸（TGA@CdS QDs）稳定的高荧光性 CdS 量子点是通过简单的水热法，由氯化镉和硫脲作为镉和硫源合成的。研究了 TGA@CdS QDs 的室温光致发光（RTPL）性质。结果表明，溶剂的极性和表面陷阶态导致 TGA@CdS QDs 的最大吸收波长和发射波长之间的斯托克斯位移变宽。使用 TGA@CdS QDs 研究了荧光测定的钴传感性能。所合成的 CdS QDs 对钴离子（Co）表现出优异的荧光猝灭选择性和灵敏度。检测限（LOD）低至 0.05 μM，远低于饮用水中钴离子的最高限量。Co 的线性响应范围为 0.5 至 80 μM。传感系统具有检测限低、选择性好、灵敏度高、方便、成本低等优点。CdS QDs 的颜色变化显示出在 Co 检测中的潜在应用。
