title: Facile synthesis of graphene oxide-silver nanocomposite and its modified electrode for enhanced electrochemical detection of nitrite ions.
abstract: In this report, silver nanoparticles (Ag NPs) were successfully deposited on graphene oxide (GO) sheets to form GO-Ag nanocomposite using garlic extract and sunlight and the nanocomposite modified glassy carbon (GC) electrode was applied as an electrochemical sensor for the detection of nitrite ions. The formation of GO-Ag nanocomposite was confirmed by using UV-visible absorption spectroscopy, TEM, XRD and FTIR spectroscopy analyses. Further, TEM pictures showed a uniform distribution Ag on GO sheets with an average size of 19 nm. The nanocomposite modified electrode produced synergistic catalytic current in nitrite oxidation with a negative shift in overpotential. The limit of detection (LOD) values were found as 2.1 µM and 37 nM, respectively using linear sweep voltammetry (LSV) and amperometric i-t curve techniques. The proposed sensor was stable, reproducible, sensitive and selective toward the detection nitrite and could be applied for the detection of nitrite in real water sample.
authors.affiliation: Low Dimensional Materials Research Centre, Department of Physics, Faculty of Science, University of Malaya, 50603 Kuala Lumpur, Malaysia; Faculty of Applied Sciences, MARA University of Technology (UiTM), 40450 Selangor, Malaysia.
authors.forename: Nurul Izrini
authors.initials: NI
authors.lastname: Ikhsan
authors.affiliation: Low Dimensional Materials Research Centre, Department of Physics, Faculty of Science, University of Malaya, 50603 Kuala Lumpur, Malaysia.
authors.forename: Perumal
authors.initials: P
authors.lastname: Rameshkumar
authors.affiliation: Low Dimensional Materials Research Centre, Department of Physics, Faculty of Science, University of Malaya, 50603 Kuala Lumpur, Malaysia.
authors.forename: Alagarsamy
authors.initials: A
authors.lastname: Pandikumar
authors.affiliation: Low Dimensional Materials Research Centre, Department of Physics, Faculty of Science, University of Malaya, 50603 Kuala Lumpur, Malaysia.
authors.forename: Muhammad
authors.initials: M
authors.lastname: Mehmood Shahid
authors.affiliation: Low Dimensional Materials Research Centre, Department of Physics, Faculty of Science, University of Malaya, 50603 Kuala Lumpur, Malaysia. Electronic address: huangnayming@um.edu.my.
authors.forename: Nay Ming
authors.initials: NM
authors.lastname: Huang
authors.affiliation: Chemical Engineering Department, The Petroleum Institute, Abu Dhabi, UAE.
authors.forename: Swadi
authors.initials: S
authors.lastname: Vijay Kumar
authors.affiliation: Department of Chemistry, Faculty of Science, University Putra Malaysia (UPM), 43400 Serdang, Malaysia.
authors.forename: Hong Ngee
authors.initials: HN
authors.lastname: Lim
keywords: Electrochemical sensor; Graphene oxide; Nanocomposite; Nitrite; Silver nanoparticles