Electrochemical sensing of H2O2 using cobalt oxide modified TiO2 nanotubes |
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| Institution: | 1. National Institute of Lasers and Optronics College, Pakistan Institute of Engineering and Applied Sciences (PIEAS), Nilore, Islamabad, 45650, Pakistan;2. Department of Physics and Applied Mathematics, Pakistan Institute of Engineering and Applied Sciences (PIEAS), Islamabad, 45650, Pakistan;3. Department of Metallurgy and Materials Engineering, Pakistan Institute of Engineering and Applied Sciences (PIEAS), Islamabad, 45650, Pakistan;4. Jiangsu Key Laboratory for Construction Materials, School of Material Science and Engineering, South East University, Nanjing, 211189, China;5. Nanosciences and Technology Department, National Centre for Physics, Islamabad, 45320, Pakistan;6. Department of Physics, Government Frontier College for Women, Peshawar, Khyber, Pakhtunkhwa, Pakistan;7. Nanomaterials Research Group, Physics Division, PINSTECH, Islamabad, 45650, Pakistan |
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| Abstract: | Cobalt oxide (Co3O4) modified anatase titanium dioxide nanotubes (ATNTs) have been investigated for the electrochemical sensing of hydrogen peroxide (H2O2). ATNTs have been synthesized by a two-step anodization process. ATNTs were then modified with Co3O4 employing chemical bath deposition method. The structure and morphology of ATNTs and their modification with Co3O4 has been confirmed by X-ray diffraction by scanning electron microscopy. H2O2 sensing has been studied in 0.1 M PBS solution, by cyclic voltammetry and amperometry. Variation in the peak positions and current densities was observed with addition of H2O2 for Co3O4 modified ATNTs. Sensitivity and limit of detection improved with modification of ATNTs with Co3O4 with precursor concentration up to 0.8 M. However, at higher precursor concentrations sensitivity and limit of detection toward H2O2 deteriorated. Co3O4 Modified ATNTS using 0.8 M precursor concentration are comparatively more suitable for H2O2 sensing applications due to the optimum formation of Co3O4/ATNTs heterojunctions. |
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| Keywords: | Cobalt oxide Cyclic voltammetry Amperometry |
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