Au nanoparticle-embellished UiO-66 on reduced graphene oxide as a non-enzymatic electrocatalyst at a remarkably low oxidation potential for glucose oxidation and sensing.

Abstract

Au nanoparticle-embellished metal-organic framework UiO-66 on reduced graphene oxide (Au/UiO-66/rGO) was synthesized. Au/UiO-66/rGO displayed strong electrocatalytic activity for oxidation of glucose in alkaline solution at a remarkably low oxidation potential of +0.20 V vs. Ag/AgCl. Au nanoparticles played a paramount role in the catalytic oxidation of glucose at the electrode, while both rGO and UiO-66 can significantly enhance the current responses to glucose. The resulting non-enzymatic glucose sensor exhibited a wide range of linear response, high sensitivity and selectivity for the determination of glucose. The sensor was successfully applied for the determination of glucose in honey products.