Highly sensitive electrochemical BPA sensor based on titanium nitride-reduced graphene oxide composite and core-shell mo
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RESEARCH PAPER
Highly sensitive electrochemical BPA sensor based on titanium nitride-reduced graphene oxide composite and core-shell molecular imprinting particles Wanzhen Xu 1 & Yiyun Zhang 1 & Xifeng Yin 2 & Liming Zhang 2 & Yunfei Cao 3 & Xiaoni Ni 3 & Weihong Huang 1 Received: 10 August 2020 / Revised: 28 October 2020 / Accepted: 13 November 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2021
Abstract A sensitive electrochemical sensor was proposed via combining molecular imprinting technique with the graphene materialdoped titanium nitride. The novel graphene with 3-dimensional structure displayed more binding sites and better electrochemical properties. Moreover, this study focused on coating pyrrole with electrical conductivity on the surface of silica as a monomer, and BPA as the template. The interaction made specific detection possible, between monomer and template. With a series of characterizations and electrochemical measurements, CPE (carbon paste electrode)-contained TiN-rGO composite was proved to have conductivity improved. Also, the modified polymer performed well selectivity which reflected in that it was almost impervious to distractions. Under optimized conditions, a linear dependence was observed from 0.5 to 100 nmol Lā1 with a detection limit of 0.19 nmol Lā1. The sensor explicated outstanding repeatability via repetitive experiment with the RSD of 0.02%, while the results of stability experiment reached the RSD of 1.90%. Eventually, it was used to analyze BPA residues in 3 kinds of daily supplies. The results indicated the potential of the sensor in environmental detection prospectively. Keywords Titanium nitride . Reduced graphene oxide . Polypyrrole . Molecular imprinting . Electrochemical sensor
Introduction BPA (bisphenol A) is a kind of endocrine-disrupting chemicals (EDCs), which is commonly used as important organic chemical materials in consumer products and food containers [1]. Although it is one of the most produced chemicals in the world, its properties of hormones not only have connection with sexual precocity in babies but also may cause heart disease, diabetes, and abnormal liver function in adults [2ā7]. In that case, methods of separating and detecting BPA from environmental waste are a hot tendency. * Xiaoni Ni [email protected] * Weihong Huang [email protected] 1
School of the Environment and Safety Engineering, Jiangsu University, Zhenjiang 212013, China
2
Zhenjiang Agricultural Products Quality Inspection and Testing Center, Zhenjiang 212003, China
3
Zhenjiang Food and Drug Supervision and Inspection Center, Zhenjiang 212004, China
Various kinds of approaches, such as HPLC, AAS, ICPMS, immunoassays, and many other issues, have been developed for detection in this field [8ā11]. Although all these methods have mature development and well performance to a certain degree, high cost, long detection period, and complex pretreatment are still recognized as weaknesses that cannot be ignored [12]. Electrochemical methods are introduced in this study d
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