Facile synthesis of graphene oxide-silver nanocomposite and its modified electrode for enhanced electrochemical detection of nitrite ions

Nurul Izrini Ikhsan, Perumal Rameshkumar, Alagarsamy Pandikumar, Muhammad Mehmood Shahid, Nay Ming Huang, Swadi Vijay Kumar, Hong Ngee Lim

    Research output: Contribution to journalArticlepeer-review

    99 Scopus citations

    Abstract

    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.

    Original languageBritish English
    Article number15815
    Pages (from-to)908-914
    Number of pages7
    JournalTalanta
    Volume144
    DOIs
    StatePublished - 25 Jul 2015

    Keywords

    • Electrochemical sensor
    • Graphene oxide
    • Nanocomposite
    • Nitrite
    • Silver nanoparticles

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