Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 246, Issue -, Pages 638-646Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2017.02.107
Keywords
Ionic liquid functionalization; Graphene oxide; Au nanoparticles; 2,4-Dichlorophenol sensor; Differential pulse voltammetry
Funding
- National Natural Science Foundation of China [21403121, 21573133, 21275085, 41476084]
- Natural Science Foundation of Shandong Province, China [ZR2014JL013, ZR2013BQ013]
- open foundation from the Key Laboratory of Marine Bioactive Substance and Modern Analysis Technology, SOA [MBSMAT-2016-02, MBSMAT-2015-04, MBSMAT-2014-02, MBSMAT-2013-01]
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Self-assembly of graphene oxide (GO) and Au nanoparticles (AuNPs) was covalently modified by ionic liquid (IL) containing amino groups to prepare the ternary nano composite of IL-GO-AuNPs. UV, IR spectra, X-ray power diffraction and scanning electron microscope confirmed the successful hybridization of these three components, leading to the larger surface area and better dispersity. Then a sensitive 2,4-Dichlorophenol (2,4-DCP) sensor was established based on IL-GO-AuNPs modified glassy carbon electrode. The IL-GO-AuNPs composite gave rise to a desirable access to the electron transfer and electrocatalytic capacity toward the oxidation of 2,4-DCP. Differential pulse voltammetry was employed for the quantitative analysis of 2,4-DCP. The proposed sensor showed a wide linear range from 0.01 to 5 mu M with a low detection limit of 3 nM (S/N =3). The developed sensor was successfully used for the determination of 2,4-DCP in water samples with satisfactory recoveries and stability. The excellent electrocatalytic performance could be attributed to the high conductivity and more active sites of IL-GO-AuNPs. (C) 2017 Elsevier B.V. All rights reserved.
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