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

作　　者：Ju Fu Xiao-Hong Tan Yao-Hua Li Xin-Jian Song 

机构地区：[1]Key Laboratory of Biologic Resources Protection and Utilization of Hubei Province,Hubei University for Nationalities [2]School of Chemical and Environmental Engineering,Hubei University for Nationalities

出　　处：《Chinese Chemical Letters》2016年第9期1541-1546,共6页中国化学快报（英文版）

基　　金：supported by the National Natural Science Foundation of China (No. 21561011);Scientific and Technological Innovation Team Project of Hubei University for Nationalities (No. MY2014T004);the Open Foundation of Key Laboratory of Biologic Resources Protection and Utilization of Hubei Province (No. PKLHB1506)

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 （nanosilicaJGSJGCE）. Electrochemical behaviors of methyl parathion （MP） on the nanosilica/GS/GCE surface were investigated thoroughly. It was found that the nanosilicaJGS 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 μmol/L to 5.6 μmol/L. The detection limit was calculated to be 0.07 nmol/L （SJN = 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.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 （nanosilicaJGSJGCE）. Electrochemical behaviors of methyl parathion （MP） on the nanosilica/GS/GCE surface were investigated thoroughly. It was found that the nanosilicaJGS 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 μmol/L to 5.6 μmol/L. The detection limit was calculated to be 0.07 nmol/L （SJN = 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.

关 键 词：Exfoliated graphene Nanosilica Modified electrodes Methyl parathion Electrochemical sensor 

分 类 号：O657.1[理学—分析化学] TP212[理学—化学]