Journal
ACS SENSORS
Volume 4, Issue 11, Pages 2980-2987Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acssensors.9b01474
Keywords
carbon fiber paper; surface engineering; electrochemical sensor; nitrite; food sample
Funding
- National Natural Science Foundation of China [21675127]
- Shaanxi Provincial Science Fund for Distinguished Young Scholars [2018JC-011]
- Development Project of Qinghai Provincial Key Laboratory [2017-ZJ-Y10]
- Capacity Building Project of Engineering Research Center of Qinghai Province [2017-GX-G03]
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In this work, we introduce our recent finding that the carbon fiber paper (CFP) treated by simple air annealing (OCFP) could be used for exceptionally high-performance electrochemical nitrite sensing. The air-annealing process endows the pristine CFP with higher defective edge/plane sites, more oxygen-containing functional groups, higher roughness, and improved wettability. The electrochemical studies show that the OCFP exhibits excellent sensing performance for nitrite, with an ultralow determination limit of 0.1 mu M and a detection limit of 0.07 mu M, an ultrawide linear determination range of 0.1-3838.5 mu M, a fast current response of 1 s, and a high sensitivity of 930.4 mu A mM(-1) cm(-2). These performance values are comparable or even superior to those for most reported noble- or transition-metal-based advanced Besides, this electrode also presents satisfactory stability, reproducibility, and feasibility of nitrite sensing in food ideal monolithic and metal-free catalyst with ultrahigh and stable detection performance, the OCFP has a high integrated into next-generation electrochemical sensing devices.
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