Construction of an electrochemical sensor based on Cu NWs/PCBs and detection of methyl parathion
Cu nanowires(Cu NWs)and polyporous carbon nanospheres(PCBs)with uniform diameter and high aspect ratio were prepared by two-step hydrothermal method,and their structures and morphologies were characterized by transmission electron microscopy(TEM).At the same time,the electrochemical sensor was constructed by drip coating method on the surface of the glassy carbon electrode,and the electrochemical behavior of the electrode was investigated by cyclic voltammetry and AC impedance method.The results show that the diameter of copper nanowires is 5~10 nm,with a high aspect ratio,and the prepared sensor has a good electrochemical response to the K3[Fe(CN)6]probe,and it is applied to the detection of parathion methyl,using differential pulse voltammetry,under the best conditions,the peak oxidation current and the concentration of methyl parathion show a good linear relationship in the range of 0.1~50 mg·L-1,and the detection limit is 0.04 mg·L-1.This sensor has the advantages of simple fabrication,high sensitivity and good linear range,and is expected to be used in the detection of actual samples.
Cu nanowirespolyporous carbon nanosphereselectrochemical sensorsmethyl parathion