An electrochemical sensing platform of cobalt oxide@gold nanocubes interleaved reduced graphene oxide for the selective determination of hydrazine

Reduced graphene oxide-cobalt oxide nanocube@gold (rGO-Co3O4@Au) nanocomposite was prepared using a one-pot hydrothermal synthesis. The nanocomposite was characterized using the UV-Vis absorption spectroscopy, field emission scanning electron microscopy (FESEM), high resolution transmission electron...

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Bibliographic Details
Published in:	Electrochimica acta Vol. 259; pp. 606 - 616
Main Authors:	Shahid, Muhammad Mehmood, Rameshkumar, Perumal, Basirunc, Wan Jeffrey, Wijayantha, Upul, Chiu, Wee Siong, Khiew, Poi Sim, Huang, Nay Ming
Format:	Journal Article
Language:	English
Published:	Oxford Elsevier Ltd 01-01-2018 Elsevier BV
Subjects:	Ascorbic acid Cobalt Cobalt oxide nanocubes Cobalt oxides Cobalt plating Detection Electrical measurement Energy transmission Ethanol Field emission microscopy Gold Gold nanoparticles Graphene Hydrazine detection Hydrazines Mapping Nanocomposites Nanoparticles Nitrophenol Oxidation Reduced graphene oxide Scanning electron microscopy Synthesis Transmission electron microscopy X-ray diffraction Cobalt oxide nanocubes Hydrazine detection Reduced graphene oxide Gold nanoparticles
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Summary:	Reduced graphene oxide-cobalt oxide nanocube@gold (rGO-Co3O4@Au) nanocomposite was prepared using a one-pot hydrothermal synthesis. The nanocomposite was characterized using the UV-Vis absorption spectroscopy, field emission scanning electron microscopy (FESEM), high resolution transmission electron microscopy (HRTEM), energy dispersive X-ray (EDX) mapping, X-ray diffraction (XRD) and Raman analyses. The EDX mapping analysis showed the uniform distribution of Au nanoparticles on the Co3O4 surface that made the surface more roughness. The higher degree of reduction of GO was confirmed from the increased intensity ratio of the D and G bands (ID/IG) of the Raman spectrum during the hydrothermal synthesis. The rGO-Co3O4@Au nanocomposite exhibited good electrocatalytic activity towards the oxidation of hydrazine in phosphate buffer (pH 7.2). The detection of hydrazine was carried out using amperometry technique and the current response was linear in the range of 10–620 μM. The limit of detection was found to be 0.443 μM. The selectivity of the nanocomposite for the sensing of hydrazine was studied with the interferents such as NO3−, SO42−, Cl−, Ag+, Na+, K+, ethanol, 4-nitrophenol, ascorbic acid and glucose. The sensing of different concentration of hydrazine present in the real water samples was analysed and an appreciable recovery was found. Cobalt oxide (Co3O4) nanocubes deposited with gold (Au) nanoparticle interleaved into reduced graphene oxide prepared by hydrothermal method and used for the electrocatalytic oxidation of Hydrazine. [Display omitted] •A ternary nanocomposite of rGO-Co3O4@Au was synthesised by a single step hydrothermal route.•The material was used for the detection of a water contaminant Hydrazine.•A lower limit of detection was obtained for Hydrazine using rGO-Co3O4@Au nanocomposite.•Selectivity of the sensor was tested in the presence of many other co-existing molecules.
ISSN:	0013-4686 1873-3859
DOI:	10.1016/j.electacta.2017.10.157