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Published on: May 2, 2014
Construction of an electrochemical sensor based on a conductive Ni3(HHTP)2 nanowires array functionalized with ag
Wenda Wang1, Qipei Cai2, Canyuan Dai1
1Center of Nano Energy and Devices, College of Electronic Information Engineering, Taiyuan University of Technology, Taiyuan 030024, Shanxi, China.
Abstract:
A highly sensitive electrochemical nitrite sensor was developed by immobilizing silver nanoparticles (Ag NPs) and tungsten disulfide quantum dots (WS2 QDs) on a conductive metal-organic frameworks (c-MOFs) consisting of Ni3(HHTP)2 (HHTP = 2,3,6,7,10,11-hexahydroxytriphenylene) nanowires array via in-situ growth and photochemical deposition techniques. The electrochemical performance of the AgNPs@WS2QDs-Ni3(HHTP)2 sensor was significantly enhanced through the optimization of the growth duration of the Ni3(HHTP)2, the content of WS2 QDs and the reduction time of Ag NPs. As a result, the prepared sensor exhibited a high sensitivity of 2200.0 μA·mM-1·cm-2 for nitrite concentrations ranging from 1.0 to 2000 μM, with a limit of detection (LOD) of 0.20 μM (S/N = 3) and a limit of quantification (LOQ) of 0.67 μM. It is attributed to the synergistic effects among the Ni3(HHTP)2 nanostructure, WS2QDs and Ag NPs. Additionally, the sensor proved to be highly practical for real-world applications in food safety and drinking water monitoring.
