▎ 摘　　要

NOVELTY - Preparing composite screen printing electrode sensor, involves (i) mixing the oxidized graphene and nano-particle material uniformly to prepare a suspension, (ii) using electric reduction method to deposit the suspension obtained on the surface of the pre-treated SPE electrode, and (iii) post-processing to obtain a composite screen-printing electrode sensor, where the nano particle material is gold nanoparticles (AuNPs), AuNS or silver nanowire (AgNW), and the corresponding composite screen print electrode sensor is RGO/AuNPs-SPE sensor, RGO/AuNS-SPe sensor, and RGO/AgNWs-SPE sensor. USE - Method for preparing composite screen printing electrode sensor used to detect charged pesticide molecules MP, MT or DM (claimed). ADVANTAGE - The method enables to prepare a composite screen-printed electrode sensor by a one-step electrochemical deposition method, so that the composite screen-printed electrode sensor combines electrokinetic trapping and surface-enhanced Raman scattering during electrokinetic trapping. The composite screen-printed electrode sensor is voltage-biased to the opposite charge to the charged pesticide molecule, which is selectively attracted to the surface of the composite screen-printed electrode sensor, and led to the formation of a sandwich-type hybrid substrate, which exhibits excellent adsorption capacity and high SERS activity, and make it an excellent SERS substrate for on-site detection of charged pesticide molecules. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for: A composite screen printing electrode sensor, is prepared by the method. An application of the composite screen-printed electrode sensor, used to detect charged pesticide molecules MP, MT or DM, When the composite screen printing electrode sensor detects MP, the composite screen printing electrode sensor is an RGO/AuNPs-SPE sensor, When the composite screen-printed electrode sensor detects MT, the composite screen-printed electrode sensor is an RGO/AuNS-SPE sensor, and When the composite screen-printed electrode sensor detects DM, the composite screen-printed electrode sensor is an RGO/ AgNWs-SPE sensor.