Palladium doped α-MnO2 nanorods on graphene as an electrochemical sensor for simultaneous determination of dopamine and paracetamol

[Display omitted] •Pd atom associated defects on α-MnO2 nanorods providing better electronic structure.•Higher EASA and conductivity from defective nature which leads to better electroactivity.•It shows a wide detection range and a LOD for simultaneous detection of DA and PA.•It can perform in real...

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Veröffentlicht in:Applied surface science 2022-03, Vol.578, p.152090, Article 152090
Hauptverfasser: Kader Mohiuddin, Abdul, Shamsuddin Ahmed, Mohammad, Jeon, Seungwon
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Sprache:eng
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Zusammenfassung:[Display omitted] •Pd atom associated defects on α-MnO2 nanorods providing better electronic structure.•Higher EASA and conductivity from defective nature which leads to better electroactivity.•It shows a wide detection range and a LOD for simultaneous detection of DA and PA.•It can perform in real sample without interference from 100-folds interferents. Defect engineering at the atomic level has been one of the most prevalent research topics in the field of catalysis because defects act as superior active sites. However, defects are difficult to create, recognize, and fully comprehend. In this study, for the first time, we demonstrate that the defects creation by palladium atom on the surface of α-MnO2 nanorods supported graphene (Pd@α-MnO2/G). These defects significantly altered the electronic and crystalline structures of the as-prepared material, as well as improving the surface/interface properties for biomolecule determination. As a result, Pd@α-MnO2/G exhibited a higher electroactive surface area, conductivity, and synergistic effect in the simultaneous detection of dopamine (DA) and paracetamol (PA) owing to its defective nature. For instance, it showed wide detection ranges from 0.2 to 425 µM and from 0.1 to 375 µM with lower limits of detection of 0.086 and 0.059 µM for DA and PA, respectively. It also showed high sensitivity (0.0591 and 0.0854 µA µM−1 for DA and PA, respectively) and experienced no interference from the presence of a 100-fold excess of interferents. Importantly, we discussed the 2H+/2e– reaction mechanism of DA and PA oxidation on the Pd@α-MnO2/G surface, for an in-depth understanding of the process.
ISSN:0169-4332
1873-5584
DOI:10.1016/j.apsusc.2021.152090