A Design And Application About Novel Sensor Based On Composite Of Functionalized Graphene And Copper(â…¡) Salt For Pesticides Detection

Sensors with graphene modified with sulfanilic acid diazonium salt followed by copper ions complexation adsorption on interdigitated electrodes(IDE) were fabricated to detect Sulfurated organophosphorus pesticides(SPP). FIR and EDS showed that sulfonic group were implanted on the graphene films. Furthermore, cyclic voltammetry curves demonstrated the difference between sulfonated graphene with copper(â…¡) complex(SG-Cu(â…¡)) and sulfonated graphene. The sensor behaved high relative resistance changes to different concentration of three kinds of analogous SPPs including Fenitrothion, Malathion and Parathion. All of these pesticides performed similar varying patterns and the detection minimums was1ppb. Moreover, we detected other three series of chemical agents including Ethyl diethyl phosphate(DEEP), Dimethyl methyl phosphonate(DMMP), Three(2-ethyl chloride) phosphate ester(TCEP) and Na2S, NasSO4,NaHSO3and Formaldehyde, Acetone, Ethanol as contrastive detection objects. The results showed that there was no obvious change rule which proved that the SG-Cu(â…¡) sensor has good selectivity. Consequently, Sensor made by SG-Cu(â…¡) displayed fast response, good reproducibility and selectivity to SPP, which was attributed to the high-efficiently conducting path of graphene and the interaction between the surface of graphene and sulfonic acid functional group complexed with copper(â…¡) salt.