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• W1978629414 abstract "A graphene oxide (GO) film coated glassy carbon electrode (GCE) was fabricated for sensitive determination of 4-nitrophenol (4-NP). The GO-based sensor was characterized by scanning electron microscope, atomic force microscopy and electrochemical impedance spectroscopy. The electrochemical behaviors of 4-NP at the GO-film coated GCE were investigated in detail. In 0.1 M acetate buffer with a pH of 4.8, 4-NP yields a very sensitive and well-defined reduction peak at the GO-modified GCE. It is found that the GO film exhibits obvious electrocatalytic activity toward the reduction of 4-NP since it not only increases the reduction peak current but also lowers the reduction overpotential. Based on this, an electrochemical method was proposed for the direct determination of 4-NP. Various kinetic parameters such as transfer electron number, transfer proton number and standard heterogeneous rate constant were calculated, and various experimental parameters were also optimized. Under the optimal conditions, the reduction peak current varies linearly with the concentration of 4-NP ranging from 0.1 to 120 μM, and the detection limit is 0.02 μM at the signal noise ratio of 3. Moreover, the fabricated sensor presented high selectivity and long-term stability. This electrochemical sensor was further applied to determine 4-NP in real water samples, and it showed great promise for simple, sensitive, and quantitative detection of 4-NP." @default.
• W1978629414 created "2016-06-24" @default.
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• W1978629414 date "2012-01-01" @default.
• W1978629414 modified "2023-10-18" @default.
• W1978629414 title "A graphene oxide-based electrochemical sensor for sensitive determination of 4-nitrophenol" @default.
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• W1978629414 doi "https://doi.org/10.1016/j.jhazmat.2011.11.076" @default.
• W1978629414 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/22178284" @default.
• W1978629414 hasPublicationYear "2012" @default.
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