A Highly Sensitive and Selective Non-enzymatic Hydrogen Peroxide Sensor Based on Nanostructured Co3O4 Thin Films Using the Sol-gel Method |
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Authors: | Hanen Khadhraoui Abdelhak Othmani Abdessalem Kouki Mouldi Zouaoui |
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Institution: | Université de Carthage, Faculté des Sciences de Bizerte, LR01 ES15, Laboratoire de Physique des Matériaux: Structure et Propriétés, 7021 Zarzouna, Bizerte, Tunisia |
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Abstract: | In this work we report an easy and efficient way to fabricate nanostructured cobalt oxide (Co3O4) thin films as a non-enzymatic sensor for H2O2 detection. Co3O4 thin films were grown on ITO glass substrates via the sol-gel method and characterized with several techniques including X-ray diffraction, scanning electron microscopy (SEM), transmission electron microscopy (TEM) and optical absorbance. The Co3O4 thin films’ performance regarding hydrogen peroxide detection was studied in a 0.1 M NaOH solution using two techniques, cyclic voltammetry (CV) and amperometry. The films exhibited a high sensitivity of 1450 μA.mM?1.cm?2, a wide linear range from 0.05 μM to 1.1 mM, and a very low detection limit of 18 nM. Likewise, the Co3O4 thin films produced showed an exceptional stability and a high selectivity. |
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Keywords: | Co3O4 H2O2 Non-enzymatic sensor Sol-Gel Thin films |
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