An electrochemical sensing platform of cobalt oxide@gold nanocubes interleaved reduced graphene oxide for the selective determination of hydrazine. (1st January 2018)

• Record Type: Journal Article
• Authors: Shahid, Muhammad Mehmood; Rameshkumar, Perumal; Basirunc, Wan Jeffrey; Wijayantha, Upul; Chiu, Wee Siong; Khiew, Poi Sim; Huang, Nay Ming
• Is Part Of: Electrochimica acta. Volume 259(2018)
• Page Start: 606
• Page End: 616
• Publication Date: 2018-01-01
• Subjects: Reduced graphene oxide -- Cobalt oxide nanocubes -- Gold nanoparticles -- Hydrazine detection; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2017.10.157
• Languages: English
• ISSNs: 0013-4686

Abstract

Abstract: Reduced graphene oxide-cobalt oxide nanocube@gold (rGO-Co3 O4 @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 Co3 O4 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-Co3 O4 @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 −, SO4 2−, 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. Graphical abstract: Cobalt oxide (Co3 O4 ) nanocubes deposited with gold (Au) nanoparticle interleaved into reduced graphene oxide prepared by hydrothermal method and used for the electrocatalytic oxidation of Hydrazine. Highlights: A ternary nanocomposite of rGO-Co3 O4 @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-Co3 O4 @Au nanocomposite. Selectivity of the sensor was tested in the presence of many other co-existing molecules.