A nanosilica/exfoliated graphene composite film-modified electrode for sensitive detection of methyl parathion

被引：22
作者：
Fu, Ju [1 ,2 ]
Tan, Xiao-Hong [2 ]
Li, Yao-Hua [2 ]
Song, Xin-Jian [1 ,2 ]
机构：
[1] Hubei Univ Nationalities, Key Lab Biol Resources Protect & Utilizat Hubei P, Enshi 445000, Peoples R China
[2] Hubei Univ Nationalities, Sch Chem & Environm Engn, Enshi 445000, Peoples R China
来源：
CHINESE CHEMICAL LETTERS | 2016年 / 27卷 / 09期
基金：
中国国家自然科学基金;
关键词：
Exfoliated graphene; Nanosilica; Modified electrodes; Methyl parathion; Electrochemical sensor; LIQUID-PHASE EXFOLIATION; NANOSHEETS-MODIFIED ELECTRODE; ELECTROCHEMICAL DETERMINATION; ORGANOPHOSPHORUS PESTICIDES; CARBON; OXIDE; NANOPARTICLES; GRAPHITE; SIO2; FUNCTIONALIZATION;
D O I：
10.1016/j.cclet.2016.07.007
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
Graphene nanosheets (GS) were easily prepared through liquid-phase exfoliation of graphite powder in N,N-dimethylformamide (DMF) with the assistance of sodium citrate. Then, GS was coated onto a glassy carbon electrode (GCE) surface by drop to fabricate a GS/GCE nanointerface. Subsequently, by using tetraethylorthosilicate sol as precursor, nanosilica was electrochemically deposited onto the GS/GCE surface to produce a nanocomposite film electrode (nanosilica/GS/GCE). Electrochemical behaviors of methyl parathion (MP) on the nanosilica/GS/GCE surface were investigated thoroughly. It was found that the nanosilica/GS nanocomposites can improve the redox peak currents of MP significantly due to the synergetic effect. The oxidation peak current was linearly related to MP concentration in the range from 0.0005 mu mol/L to 5.6 mu mol/L. The detection limit was calculated to be 0.07 nmol/L (S/N = 3). The developed method was used to determine MP in real samples. The recoveries were in the range from 95.4% to 104.2%, demonstrating satisfactory results. (C) 2016 Chinese Chemical Society and Institute of Materia Medica, Chinese Academy of Medical Sciences. Published by Elsevier B.V. All rights reserved.
引用
收藏
页码：1541 / 1546
页数：6
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