| Autor: |
M.S. Anantha, S.R. Kiran Kumar, D. Anarghya, Krishna Venkatesh, M.S. Santosh, K. Yogesh Kumar, H.B. Muralidhara |
| Jazyk: |
angličtina |
| Rok vydání: |
2021 |
| Předmět: |
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| Zdroj: |
Sensors International, Vol 2, Iss , Pp 100087- (2021) |
| Druh dokumentu: |
article |
| ISSN: |
2666-3511 |
| DOI: |
10.1016/j.sintl.2021.100087 |
| Popis: |
In this study, we have compared the performance of a bare carbon paste electrode (BCPE) against the ZnO@MnO2 nanocomposite modified carbon paste electrode (MCPE) in the electrochemical determination of dopamine (DA). Chemical and structural features of the ZnO@MnO2 nanocomposites were characterized using scanning electron microscopy (SEM), energy dispersive X-Ray analysis (EDX), transmission electron microscopy (TEM), X-Ray diffraction (XRD), thermo-gravimetric analysis (TGA) with differential thermal Analysis (DTA) and Brunauer-Emmet-Teller (BET) surface area analysis. The cyclic voltammetry (CV) measurement of the ZnO@MnO2 nanocomposite MCPE showed better oxidative catalytic activity (3.6 μA) towards the DA than BCPE with higher efficiency (44.50%) in sensing the dopamine, making MCPE suitable for developing biosensors. The electrochemical studies were carried out in 5 × 10−5 M DA and obtained results were measured in the potential range of −0.2 to 0.6 V vs. saturated calomel electrode (SCE). The electrochemical performance of electrochemical impedance spectroscopy (EIS) and Tafel technique were measured for the BCPE and MCPE using 0.2 M phosphate buffer to maintain pH 7.2 with the scan rate of 50 mV/s. The redox peak current for MCPE Vs scan rate had good linearity with correlation coefficients of R2 = 0.9996, which represents the diffusion controlled process was under controlled electron transfer reaction. It is expected that the good electrocatalytic behavior of MCPE can be utilized for the fabrication of biosensors. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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