Modification of SPCE by Reduction of Graphene Oxide and Electrodeposition of Zinc Oxide Nanoparticles for Electrochemical Sensor

Zinc oxide nanoparticles (ZnO-NPs) were prepared for modification of SPCE at simple and less time consuming technique. The electrodeposition method was used to produce zinc oxide nanoparticles on reduced graphene oxide and SPCE (ZnO-NPs/rGO/SPCE) in order to enhance the performing of electrochemical properties of ZnO-NPs in the field of electrochemical sensor. The physical and chemical properties of graphene oxide (GO) before and after reduction along with zinc oxide nanoparticles (ZnO-NPs) were observed by field emission scanning electron microscopy, energy dispersive x-ray and Raman spectroscopy. The C/O ratio in reduced graphene oxide was higher than graphene oxide which indicate the small amount of oxygen containing functional group were still presented in the reduced graphene oxide. The redox reactivity of ZnONPs/rGO/SPCE has been affirmed and compared with rGO/SPCE and bare SPCE by cyclic voltammetry. Besides, the reduced graphene oxide with additional of zinc oxide nanoparticles gave the high electrical conductivity compared to other composites.