A Novel "Off-On" Fluorescent Probe Based on Carbon Nitride Nanoribbons for the Detection of Citrate Anion and Live Cell Imaging

作者：Hu, Yanling; Yang, Dongliang; Yang, Chen; Feng, Ning; Shao, Zhouwei; Zhang, Lei; Wang, Xiaodong; Weng, Lixing; Luo, Zhimin; Wang, Lianhui^*

来源：Sensors (Switzerland), 2018, 18(4): 1163.

DOI：10.3390/s18041163

• carbon nitride
• nanoribbons
• fluorescent detection
• citrate anion
• biosensing

A novel fluorescent "off-on" probe based on carbon nitride (C3N4) nanoribbons was developed for citrate anion (C6H5O73-) detection. The fluorescence of C3N4 nanoribbons can be quenched by Cu2+ and then recovered by the addition of C6H5O73-, because the chelation between C6H5O73- and Cu2+ blocks the electron transfer between Cu2+ and C3N4 nanoribbons. The turn-on fluorescent sensor using this fluorescent "off-on" probe can detect C6H5O73- rapidly and selectively, showing a wide detection linear range (1 similar to 400 mu M) and a low detection limit (0.78 mu M) in aqueous solutions. Importantly, this C3N4 nanoribbon-based "off-on" probe exhibits good biocompatibility and can be used as fluorescent visualizer for exogenous C6H5O73- in HeLa cells.

• 出版日期2018-4
• 单位南京邮电大学