Catalyst-free (00 l) oriented ZnO nanorods (NRs) -based biosensor for the H2O2 sensing has been reported. The (002) oriented ZnO NRs as confirmed by X-ray diffraction were successfully grown on indium tin oxide (ITO) coated glass substrate by radio frequency (RF) sputtering technique without using any catalyst. Horseradish peroxidase (HRP) enzyme was immobilized on ZnO NRs by physical adsorption technique to prepare the biosensor. In this HRP/ZnO NR/ITO bioelectrode, nafion solution was added to form a tight membrane on surface. The prepared bioelectrode has been used for biosensing measurements by electrochemical analyzer. The electrochemical studies reveal that the prepared HRP/ZnO NR/ITO biosensor is highly sensitive to the detection of H2O2 over a linear range of 0.250–10 μM. The ZnO NR-based biosensor showed lower value of detection limit (0.125 μM) and higher sensitivity (13.40 µA/µM cm2) towards H2O2. The observed value of higher sensitivity attributed to larger surface area of ZnO nanostructure for effective loading of HRP besides its high electron communication capability. In addition, the biosensor also shows lower value of enzyme’s kinetic parameter (Michaelis–Menten constant, K m) of 0.262 μM which indicates enhanced enzyme affinity of HRP to H2O2. The reported biosensor may be useful for various applications in biosensing, clinical, food, and beverage industry.
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The authors would like to acknowledge TEQIP-II and center for interdisciplinary research lab (CIR) MNNIT, Allahabad, for providing financial assistance and facilities to carry out this research work. The authors also gratefully acknowledge IIT Kanpur for providing SEM facility.
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Srivastava, A., Kumar, N., Singh, P. et al. H2O2 sensing using HRP modified catalyst-free ZnO nanorods synthesized by RF sputtering. Appl. Phys. A 123, 453 (2017). https://doi.org/10.1007/s00339-017-1065-4