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Ultra-sensitive 2-nitrophenol detection based on reduced graphene oxide/ZnO nanocomposites
- Ultra-sensitive 2-nitrophenol detection based on reduced graphene oxide/ZnO nanocomposites
- Alam, M.K.[Alam, Md Kawsar]; Rahman, M.M.[Rahman, Mohammed Mahfujur]; Abbas, M.[Abbas, Mohamed]; Torati, S.R.[Torati, Sri Ramulu]; Asiri, A.M.[Asiri, Abdullah M.]; Kim, D.[Kim, Do Jin]; Kim, C.[Kim, Cheol Gi]
- DGIST Authors
- Alam, M.K.[Alam, Md Kawsar]; Abbas, M.[Abbas, Mohamed]; Torati, S.R.[Torati, Sri Ramulu]; Kim, C.[Kim, Cheol Gi]
- Issue Date
- Journal of Electroanalytical Chemistry, 788, 66-73
- Article Type
- 2-Nitrophenol; Chemical Reduction; Chemical Sensors; Cost Effectiveness; Decomposition; Electrodes; Environment Safety; Glass; Glass Membrane Electrodes; Glassy Carbon Electrode; Glassy Carbon Electrodes; Graphene; High Resolution Transmission Electron Microscopy; I-V Method; Indicators (Chemical); Iodine; Nanocomposites; R-Go/ZnO Nanocomposites; Reduction; Sensitivity; Signal-to-Noise Ratio; Thermogravimetric Analysis; Transmission Electron Microscopy; X Ray Diffraction; Zinc Compounds
- Polyethylene glycol mediated reduced graphene oxide/zinc oxide (r-GO/ZnO) nanocomposites were synthesized by simple and cost-effective chemical reduction method using graphene oxide and zinc acetate as the precursors. The crystalline structure, morphology and thermal decomposition of the as-prepared r-GO/ZnO nanocomposites were characterized by X-ray diffraction, transmission electron microscopy and thermogravimetric analysis, respectively. Elemental composition was analyzed by energy dispersive spectra and mapping. A selective 2-nitrophenol (2-NP) sensor onto glassy carbon electrode (GCE) was fabricated with a thin-layer of synthesized r-GO/ZnO composites. Improved electrochemical responses with high sensitivity including large dynamic range and long-term stability towards the selective 2-NP were acquired using the fabricated r-GO/ZnO/GCE sensor. The calibration curve was found linear (r2: 0.9916) over a wide range of 2-NP concentrations (10.0 nM–10.0 mM). The detection limit and the sensitivity were calculated as 0.27 nM and 5.8 μA·mM− 1 cm− 2 respectively based on 3 N/S (Signal-to-Noise ratio). In this approach, 2-NP was detected by I-V method using r-GO/ZnO composites modified GCE electrode with very high sensitivity compared to various nanocomposites reported earlier. The synthesis of r-GO/ZnO composites using chemical reduction process is a good way of establishing sensor based r-GO/ZnO composites for toxic and carcinogenic chemicals. © 2017 Elsevier B.V.
- Elsevier B.V.
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