DNA-dispersed graphene/NiO hybrid materials for highly sensitive non-enzymatic glucose sensor

We demonstrate graphene nanosheet/NiO hybrids (GNS/NiO) as the active material for high-performance non-enzymatic glucose sensors. Such sensors are fabricated by DNA-dispersed GNS/NiO suspension deposited on glassy carbon electrodes. ss-DNA shows strong dispersing ability for the GNS/NiO hybrid materials resulting in stable water-dispersible GNS/NiO/DNA hybrids with fully separated layers. The GNS/NiO/DNA hybrids show enhanced electron transfer in the electrocatalytic reaction process, and accordingly, such hybrids modified electrodes show good sensing performance towards glucose and are characterized by large detection ranges, short response periods, low detection limit and high sensitivity and stability.

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► We investigated the potential of GNS/NiO/DNA hybrid used as a nonenzymatic sensor.
► DNA is a highly efficient disperse agent for GNS/NiO hybrid than ionic surfactants.
► GNS/NiO/DNA hybrid shows fast electron transfer in the electrochemical reaction.
► GNS/NiO/DNA hybrid shows good detection performance towards glucose.