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Direct electrochemical reduction of hematite decorated graphene oxide (α-FeO@erGO) nanocomposite for selective detection of Parkinson's disease biomarker. | LitMetric
An unusual approach is reported herein to fabricate magnetic hematite (α-FeO) decorated electrochemically reduced graphene oxide (α-FeO@erGO) nanocomposite. The method utilizes direct electrochemical reduction of self-assembled, ex-situ synthesized α-FeO anchored GO to erGO (α-FeO@erGO) on glassy carbon electrode (GCE) for selective detection dopamine (DA), an important biomarker of Parkinson's disease. The formation of α-FeO@erGO/GCE has been confirmed by XPS and Raman spectroscopy. α-FeO@erGO modified GCE exhibits synergistic catalytic activity nearly 2.2 and 5 fold higher than α-FeO@GO and other modified electrodes, respectively towards oxidation of DA. The fabricated sensor exhibited linear dynamic ranges over 0.25 - 100 µM in response to DA with a LOD of 0.024 µM (S/N = 3), LOQ of 0.08 µM (S/N = 10), and a sensitivity of 12.56 µA µM cm. Finally, the practical analytical application of the proposed α-FeO@erGO/GCE was investigated for the determination of DA in commercially available pharmaceutical formulation and human serum samples, and showed satisfactory recovery results towards DA.
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