Electrochemically prepared oxygen and sulfur co-doped graphitic carbon nitride quantum dots for fluorescence determination of copper and silver ions and biothiols.

Author(s) Wang, H.; Lu, Q.; Li, M.; Li, H.; Liu, Y.; Li, H.; Zhang, Y.; Yao, S.
Journal Anal Chim Acta
Date Published 2018 Oct 16

Although great advances have been achieved in synthesis of fluorescent graphitic carbon nitride quantum dots (g-CN-dots), it is still challenging to develop g-CN-dots with high fluorescence quantum yield (FLQY) and multiple sensing functionalities. Herein, the oxygen and sulfur co-doped graphitic carbon nitride quantum dots (OS-g-CN-dots) with high FLQY of 33.9% were firstly synthesized by a simple electrochemical "tailoring" process. It was found that OS-g-CN-dots could specifically bind copper ions (Cu) and silver ions (Ag), accompanied with a dramatic "turn-off" fluorescence response. With the help of different masking agents, OS-g-CN-dots are able to selectively detect Cu and Ag. Furthermore, the generated OS-g-CN-dots/Ag displayed a "turn-on" fluorescent response specific to biothiols (HCy, Cys and GSH). Therefore, the multiple functional sensing platforms based on "ON-OFF-ON" fluorescence response of OS-g-CN-dots for the detection of Cu, Ag and biothiols were constructed. Under the optimal conditions, the detection limits of Cu, Ag, HCy, Cys and GSH were as low as 7.0 × 10 M, 2.0 × 10 M, 1.0 × 10 M, 1.0 × 10 M and 8.4 × 10 M, respectively. Moreover, the prepared platforms could be successfully applied to the determination of Cu, Ag and biothiols in practical samples and exhibited excellent sensitivity and selectivity.

DOI 10.1016/j.aca.2018.03.063
ISSN 1873-4324
Citation Anal Chim Acta. 2018;1027:121129.

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