Yin, Hewen, Zhang, Yongya, Dong, Hui, Liu, Lantao, Wang, Xiaobing, Zhang, Yintang, Xu, Maotian, and Zhou, Yanli
In this work, in situ confinement polymerization was developed for the formation of silver nanoclusters (AgNCs) homogeneously distributed on nitrogen-doped carbon (NCS) utilizing N-vinyl functionalized imidazolium ionic liquids (ILs) as stabilizers and carbon precursors. The fabricated AgNC@NCSs exhibited excellent electrochemical and catalytic properties due to their controlled structure and morphology, the unique layered structure of the carbon carriers, and the confinement effect. The AgNC@NCS material was further fabricated for a printing electrode, which also acted as an internal reference for ratiometric and accurate detection. Nitrite was used as a target to verify the feasibility of self-calibrating detection at the AgNC@NCS printing electrode. The present electrochemical sensor demonstrated superior nitrite sensing characteristics, accompanied by a wide linear range (1.12–1400 μM), low detection limit (0.38 μM), high stability, and strong anti-interference ability. Importantly, high reliability of this self-calibrating detection was obtained for nitrate determination in food samples. Our work provides an efficient strategy for the design of self-calibrating electrodes in the area of electrochemical sensing. [ABSTRACT FROM AUTHOR]