Utilization of polyvinyl amine hydrolysis product in enhancing the catalytic properties of Co3O4 nanowires: Toward potentiometric glucose bio-sensing application
Résumé
In this study, we have used a concept of overnight hydrolysis of polyvinyl amine and its role towards the enhancement of catalytic properties of cobalt oxide (Co3O4) nanostructures. The use of the hydrolyzed products in the synthesis of controlled Co3O4 nanostructures was investigated by hydrothermal method. Both of hydrocarbon chain and amide groups were produced and exhibited strong impact on the morphology and catalytic properties of Co3O4. The hydrolyzed products supported the well-defined Co3O4 nanowires morphology. Additionally, the produced Co3O4 nanowires displayed high surface to volume ratio and they were loaded with high quantity of glucose oxidase, and consequently a sensitive potentiometric response towards glucose detection was observed. Importantly, the proposed biosensor was tested against several analytical parameters such as linear range, stability, reproducibility, repeatability, storage life time, 2 selectivity, and response time. Resulted attested that the fabricated Co3O4-based glucose biosensor exhibited a linear response over the concentration range of 0.0005 to 6 mM with a limit of detection(LOD) of 0.0001mM. The Nernstian slope of 42 mV/dec of fabricated glucose biosensor was estimated. The storage life was also studied for four weeks. Furthermore, the improved electrochemical sensing performance of Co3O4 nanowires was evidenced by electrochemical impedance spectroscopy measurements, which showed low charge transfer resistance of 2.2 x 10 3 Ohms. The produced glucose biosensor was successfully used to quantify the glucose concentration from real blood samples, thereby emphasizing its possible utilization as an alternative tool for monitoring of glucose levels. Thus, this new synthesis concept has a high potential for production of large scale well-defined morphology and improved catalytic properties of desired nanostructured materials to suit various electrochemical applications including batteries, supercapacitors, and water splitting.
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