Palladium nanoparticles on electrochemically reduced chemically modified graphene oxide for non-enzymatic bimolecular sensing

Abstract

This paper reports on the design, fabrication, and characterization of palladium nanoparticles (PdNPs) on electrochemically reduced chemically modified graphene oxide (ERCGO) modified gold substrate for enzyme-free bimolecular detection. The ERCGO-modified electrode was prepared electrochemically, which is a fast and controllable process due to the high cathodic reduction of oxygen functional groups of chemically modified graphene oxide on the surface of a gold substrate electrode in sodium hydroxide (NaOH) solution. Then, PdNPs were deposited electrochemically, which were dispersed homogeneously on the surface of ERCGO. The fabricated hybrid electrode exhibited good performance, along with low working potential, high sensitivity, low detection limit, and long-term stability, which are attributed to the high surface area of ERCGO that enabled the deposition of PdNPs. This electrode offers great promise for a new class of nanostructured electrodes, for non-enzymatic biosensor applications.