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

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...

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Bibliographic Details
Published in:Talanta (Oxford) 2015-11, Vol.144, p.908-914
Main Authors: Ikhsan, Nurul Izrini, Rameshkumar, Perumal, Pandikumar, Alagarsamy, Mehmood Shahid, Muhammad, Huang, Nay Ming, Vijay Kumar, Swadi, Lim, Hong Ngee
Format: Article
Language:English
Subjects:
Electrochemical sensor
Graphene oxide
Nanocomposite
Nitrite
Silver nanoparticles
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Summary: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 19nm. 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 2.1µM and 37nM, 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. Silver nanoparticles were successfully deposited on graphene oxide sheets to form GO–Ag nanocomposite by a simple synthetic approach using garlic extract and sunlight and it was used as an electrochemical sensor for the detection of nitrite ions. [Display omitted] •Synthesis of Ag nanoparticles–graphene oxide nanocomposite for nitrite detection.•TEM pictures showed the uniform deposition of Ag NPs on GO sheet.•Nanocomposite modified GC electrode showed synergistic electocatalytic activity.•LOD was found as 37nM using amperometric i–t curve toward nitrite detection.•Sensor was stable, reproducible, selective and applicable to real sample analysis.
ISSN:0039-9140
1873-3573
DOI:10.1016/j.talanta.2015.07.050