College of Chemistry and Molecular Engineering, Nanjing Tech University, Nanjing 210000, China.
Changzhou Vocational Institute of Engineering, Changzhou 213100, China.
Sensors (Basel). 2019 Jan 10;19(2):247. doi: 10.3390/s19020247.
Silver is a common catalyst in industrial production, and the frequent use of Ag⁺ can cause water pollution. Thus, the detection of Ag⁺ in the environment is necessary to determine the level of pollution from silver. In this work, we designed a new, highly selective near-infrared (NIR) fluorescent probe QCy to detect Ag⁺. The probe exhibits "turn-off" fluorescence quenching responses at 760 nm towards Ag⁺ over other relevant cations, with outstanding sensitivity and a low detection limit (0.03 µM), which is considerably lower than the standard of the World Health Organization (WHO) for drinking water (0.9 µM). Meanwhile, QCy showed a very good linearity at a low concentration of Ag⁺ with a 'naked eye' visible color change of solution from blue to red. The probe has been applied successfully for the detection of Ag⁺ in real water samples.
银是工业生产中常见的催化剂，Ag⁺的频繁使用会导致水污染。因此，有必要检测环境中的 Ag⁺，以确定银污染的程度。在这项工作中，我们设计了一种新的、高选择性的近红外（NIR）荧光探针 QCy 来检测 Ag⁺。该探针对 Ag⁺具有“关闭”荧光猝灭响应，在 760nm 处，对其他相关阳离子具有出色的灵敏度和低检测限（0.03µM），远低于世界卫生组织（WHO）饮用水标准（0.9µM）。同时，QCy 在低浓度 Ag⁺下表现出很好的线性关系，溶液的颜色从蓝色变为红色，肉眼可见。该探针已成功应用于实际水样中 Ag⁺的检测。
