High-performance ZnO nanowires-based glucose biosensor modified by graphene nanoplates

Abstract

ZnO nanowires (NWs) are known to be highly sensitive to glucose due to their strong electron transfer and adsorption as well as stability and high surface to volume ratio. On the other hand, thanks to its suitable conductivity, and chemical stability, Graphene is the most rampant nanomaterial used in electrochemical sensors. We have previously reported the fabrication of a glucose biosensor based on ZnO NWs synthesis on an Au interdigitated electrode. In this paper, we present the modification of the sensor by incorporation of Graphene Nanoplates (GNPs) beneath the ZnO NWs to achieve a glucose biosensor with high proficiency. The experimental results show excellent improvement in the sensor performance in glucose detection due to this modification. The synergetic effects of ZnO NWs and GNPs have resulted in a desirable performance by the proposed sensor. The response time of 5 s, the detection range of 0.003–30000 mg/dL and long-term electrical stability are three outstanding characteristics of the sensor.