Fluorescence Spectroscopy Research Laboratory, Department of Chemistry, Shivaji University, Kolhapur, Maharashtra, 416004, India.
Department of Chemistry, Uka Tarsadia University, Maliba Campus, Bardoli, Gujarat, 394350, India.
Anal Bioanal Chem. 2020 May;412(12):2993-3003. doi: 10.1007/s00216-020-02550-7. Epub 2020 Mar 7.
Highly fluorescent nitrogen-doped carbon dot (NCD) threads were synthesized via simple pyrolysis of citric acid, p-hydroxybenzoic acid, and ammonia. The NCDs show excitation-independent behavior with maximum excitation and emission wavelengths of 350 nm and 435 nm, respectively. The developed probe was used as a turn-off fluorescent sensor for the selective and sensitive determination of permanganate ions in aqueous media. The probe's hydrogel hybrid displayed a beautiful purple color demonstrating its potential as a naked eye sensor for gold detection. The ratiometric sensor exhibited excellent selectivity towards permanganate ions over 27 other ions with a linear range of 510 nM to 2 μM, a detection limit of 170 nM, and a linear regression value (R) of 0.9944. Similarly, the linear range and limit of detection for gold ions was 3.89-20 μM and 1.285 μM, respectively. The synthesized NCDs were also used as a fluorescent ink as well as a naked eye marker in association with a gold solution demonstrating its potential forensic and anti-counterfeiting applications. Graphical abstract.
通过柠檬酸、对羟基苯甲酸和氨的简单热解合成了具有高光致荧光性的氮掺杂碳点（NCD）纤维。NCD 的最大激发和发射波长分别为 350nm 和 435nm，具有激发独立的行为。所开发的探针可用作关闭荧光传感器，用于在水介质中选择性和灵敏地测定高锰酸盐离子。探针的水凝胶杂化显示出美丽的紫色，表明其具有作为金检测的肉眼传感器的潜力。比率传感器对高锰酸盐离子具有出色的选择性，对 27 种其他离子的线性范围为 510nM 至 2μM，检测限为 170nM，线性回归值（R）为 0.9944。同样，金离子的线性范围和检测限分别为 3.89-20μM 和 1.285μM。所合成的 NCD 还可用作荧光墨水以及与金溶液结合的肉眼标记物，展示了其在法医学和防伪方面的潜在应用。
