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标题：Gold nanoparticle-based sensing platform of hydrazine, sulfite, and nitrite for food safety and environmental monitoring
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作者：Govindhan Maduraiveeran ; Govindhan Maduraiveeran ; Ramasamy Ramaraj 等
期刊名称：Journal of Analytical Science and Technology
电子版ISSN：2093-3371
出版年度：2017
卷号：8
期号：1
页码：1-10
DOI：10.1186/s40543-017-0113-1
语种：English
出版社：Korea Basic Science Institute
摘要：Abstract Background A facile and sensitive electrochemical sensor platform has been explored based on gold nanoparticles (Au NPs) dispersed in amine-functionalized three-dimensional (3D) silicate sol–gel network for ((aminopropyl)triethoxysilane (APS)-Au NPs) for multi-analytes such as hydrazine, sulfite, and nitrite. Methods Au NPs dispersed silicate network was prepared via a single-step chemical reduction strategy. The Au NPs-based sensor platform was fabricated through drop-cast on a glassy carbon (GC) electrode. Results The fabricated APS-Au NPs-based sensor was characterized by ultraviolet–visible (UV–Vis) spectroscopy, cyclic voltammetry (CV), and scanning electrochemical microscopy (SEM). The resultant sensor was employed for the electrocatalytic and sensor applications towards hydrazine, sulfite, and nitrite in 0.1 M phosphate buffer (PB) (pH 7.2). The APS-Au NPs sensor exhibited an excellent catalytic activity in the absence of any other electron transfer mediators/enzyme immobilized at the electrode surface. The electrocatalytic oxidation of hydrazine, sulfite, and nitrite occurs at ~40, ~170, and ~550 mV, respectively, which is lesser positive potential of ~810, ~735, and ~393 mV for the oxidation of hydrazine, sulfite, and nitrite, respectively, than that of the bare GC electrode. Moreover, the present sensor showed low detection limits of 10 nM, 100 nM, and 1 μM for hydrazine, sulfite, and nitrite respectively. Conclusions APS-Au NPs sensor highlights the successful design for sensitive detection of multi-target analytes for food safety and environmental monitoring applications. Graphical abstract Gold nanoparticles based electrochemical food safety and environmental sensor platform is developed with significantly reduced overpotential
关键词：Gold nanoparticle;Silicate network;Modified electrode;Electrocatalysis;Electrochemical sensor