Fabrication of interdigitated high-performance zinc oxide nanowire modified electrodes for glucose sensing

• ZnO nanowire (NW) modified Interdigitated electrode (IDE) to monitor the level of glucose is fabricated using silver.
• Amendment of ZnO-based thin film and NW were done.
• ZnO thin films that was annealed yielded a good quality crystallite sized, 50, 100 and 110 nm.
• A flower-model NW was obtained with the lowest diameter of 21 nm.
• Designed IDE was shown to have the detection limit as low as 0.03 mg/dL of glucose with a fast response time of 3 s.

Diabetes is a metabolic disease with a prolonged elevated level of glucose in the blood leads to long-term complications and increases the chances for cardiovascular diseases. The present study describes the fabrication of a ZnO nanowire (NW)-modified interdigitated electrode (IDE) to monitor the level of blood glucose. A silver IDE was generated by wet etching-assisted conventional lithography, with a gap between adjacent electrodes of 98.80 μm. The ZnO-based thin films and NWs were amended by sol–gel and hydrothermal routes. High-quality crystalline and c-axis orientated ZnO thin films were observed by XRD analyses. The ZnO thin film was annealed for 1, 3 and 5 h, yielding a good-quality crystallite with sizes of 50, 100 and 110 nm, and the band gaps were measured as 3.26, 3.20 and 3.17 eV, respectively. Furthermore, a flower-modeled NW was obtained with the lowest diameter of 21 nm. Our designed ZnO NW-modified IDE was shown to have a detection limit as low as 0.03 mg/dL (correlation coefficient = 0.98952) of glucose with a low response time of 3 s, perform better than commercial glucose meter, suitable to instantly monitor the glucose level of diabetes patients. This study demonstrated the high performance of NW-mediated IDEs for glucose sensing as alternative to current glucose sensors.

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