文献类型：期刊文献

英文题名：Polypyrrole and graphene quantum dots @ Prussian Blue hybrid film on graphite felt electrodes: Application for amperometric determination of L-cysteine

作者：Wang, Lei[1];Tricard, Simon[3];Yue, Pengwei[1];Zhao, Jihua[1];Fang, Jian[1];Shen, Weiguo[1,2]

机构：[1]Lanzhou Univ, Sch Chem & Chem Engn, Key Lab Nonferrous Met Chem & Resources Utilizat, Lanzhou 730000, Peoples R China;[2]E China Univ Sci & Technol, Sch Chem & Chem Engn, Shanghai 200237, Peoples R China;[3]Univ Toulouse, CNRS, INSA, Lab Phys & Chim Nanoobjets, F-31077 Toulouse, France

年份：2016

卷号：77

起止页码：1112

外文期刊名：BIOSENSORS & BIOELECTRONICS

收录：;EI(收录号：20154601546057);WOS:【SCI-EXPANDED(收录号:WOS:000366766900156)】；

基金：Financial support was provided by the National Natural Science Foundation of China (Projects 20603014 and 21403098) and the Fundamental Research Funds for the Central Universities (Project lzujbky-2011-116).

语种：英文

外文关键词：Graphene quantum dots; Prussian Blue; Polypyrrole; Biosensors; L-cysteine

摘要：A novel polypyrrole (PPy) and graphene quantum dots (GQDs) @ Prussian Blue (PB) nanocomposite has been grafted on a graphite felt (GF) substrate (PPy/GQDs@PB/GF), and has been proven to be an efficient electrochemical sensor for the determination of L-cysteine (L-cys). GQDs, which were fabricated by carbonization of citric acid and adsorbed on GF surface ultrasonically, played an important role for promoting the synthesis process of PB via a spontaneous redox reaction between Fe3+ and [Fe(CN)(6)](3-). The PPy film has been electro-polymerized to improve the electrochemical stability of the PPy/GQDs@PB/GF electrode. The as-prepared electrode was characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), infrared spectroscopy (IR), X-ray diffraction (XRD) and electrochemical methods. It exhibited an excellent activity for the electrocatalytic oxidation of L-cys, with a detection sensitivity equal to 0.41 A mol(-1) L for a concentration range of 0.2-50 mu mol L-1, and equal to 0.15 A mol(-1) L for a concentration range of 50-1000 mu mol L-1. A low detection limit of 0.15 mu mol L-1, as well as a remarkable long-time stability and a negligible sensitivity to interfering analytes, were also ascertained. (C) 2015 Elsevier B.V. All rights reserved.