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Highly sensitive and selective carbon dot sensor for hydrogen sulfide based on dual quenching effect

Version 2 2025-02-04, 19:00
Version 1 2025-02-04, 19:00
Posted on 2025-02-04 - 19:00
Due to serious impact of Hydrogen sulfide (H2S) on environment and human health, a series of sensor have been increasingly used in industrial production and daily life. In this work, we introduce a novel detection method for the trace H2S in liquid and gaseous phase based on the dual-quenching mechanism (DQE) of silver-doped carbon dots (CDs@Ag+). Ag+ could significantly enhance the fluorescence intensity and detection sensitivity. In the linear detection range of 10-120 nM H2S solution, the CDs@Ag+ sensor has a limit of detection (LoD) of 0.83 nM and response time of 1 min. An enhanced fluorescent sensing film is prepared by assembling CDs@Ag+ on a silica microsphere (SM) microstructured substrate (CDs@Ag+/SM@PVA). Within the linear detection range of 1-50 ppm, the film sensor has the advantages of low detection limit (0.41 ppm), fast response time (5 mins), stable performance, electromagnetic interference resistance, ease of integration, and in-field detection. It is expected to develop into a compact portable on-site H2S trace sensor.

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AUTHORS (10)

Tian Xie
Liping Liu
Wei Zhou
Weide Kang
lili wen
Shiyue Wang
Zongbao Li
Jianxin Yang
Ho-Pui Ho
Xiaofang Jiang

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