Abstract
In this study, we used the concept of overnight hydrolysis of polyvinyl amine to grow cobalt oxide (Co3O4) nanostructures with enhanced catalytic properties. The controlled synthesis of Co3O4 nanostructures was carried out with the hydrothermal method using hydrolyzed products. Results showed that the hydrocarbon chain and amide groups produced during the growth process have a great impact on both the morphology and catalytic properties of Co3O4 nanostructures. In fact, the hydrolyzed products supported the growth of nanostructures with a well-defined almost one-dimensional (1-D) morphology of Co3O4 nanowires with a high surface/volume ratio. The as-prepared nanowires were loaded with a high amount of glucose oxidase in order to make them sensitive to glucose and observe a potentiometric response in its presence. The performance of the fabricated biosensor was evaluated in terms of different analytical parameters such as linear range, stability, reproducibility, repeatability, life time, selectivity, and response time. Thus, the obtained Co3O4-based glucose biosensor exhibited a linear response over the concentration range from 0.0005 to 6 mM, with a limit of detection of 0.0001 mM. The estimated Nernstian slope for the glucose biosensor was 42 mV/dec, with stability that exceeds four weeks. Using electrochemical impedance spectroscopy, the Co3O4 nanowires showed a low charge transfer resistance of 2.2 × 103 Ohms. Practically, the biosensor was used successfully to measure the glucose concentration in real blood samples. The results obtained confirm that the proposed glucose biosensor can be used as an alternative tool for monitoring glucose levels. The synthesis procedure described herein has a high potential to produce nanostructured materials on a large scale with well-defined morphology and improved catalytic properties for possible applications in batteries, supercapacitors, and water splitting.
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The datasets generated and analyzed during this study are available from the corresponding author upon reasonable request.
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Acknowledgements
We extend our sincere appreciation to the Researchers Supporting Project (RSP-2022/79) at King Saud University, Riyadh, Saudi Arabia, for partial funding of this work. We would like to thank the platform “Microscopies, Microprobes and Metallography (3 M)” (Institut Jean Lamour, IJL, Nancy, France) for providing access to SEM facilities.
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MDA did electrochemical measurements. AA discussed the electrochemical results. AN partially supervised and finance the work. SSM wrote the first draft of the manuscript. AAS did XRD measurement. UA did EIS measurement and analyzed the results. MHI synthesized materials. ABM partially supervised the work. AT did XRD analysis. MT edited the draft of the manuscript. BV did SEM measurement. ZHI supervised the work and proofread the manuscript.
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Albaqami, M.D., Alothman, A.A., Nafady, A. et al. Utilization of polyvinyl amine hydrolysis product in enhancing the catalytic properties of Co3O4 nanowires: toward potentiometric glucose bio-sensing application. J Mater Sci: Mater Electron 33, 11555–11568 (2022). https://doi.org/10.1007/s10854-022-08128-6
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DOI: https://doi.org/10.1007/s10854-022-08128-6