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

Ikhsan NI 1 , Rameshkumar P 2 , Pandikumar A 2 , Mehmood Shahid M 2 , Huang NM 3 , Vijay Kumar S 4 Show all authors , Lim HN 5

Affiliations 

  • 1 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
  • 2 Low Dimensional Materials Research Centre, Department of Physics, Faculty of Science, University of Malaya, 50603 Kuala Lumpur, Malaysia
  • 3 Low Dimensional Materials Research Centre, Department of Physics, Faculty of Science, University of Malaya, 50603 Kuala Lumpur, Malaysia. Electronic address: huangnayming@um.edu.my
  • 4 Chemical Engineering Department, The Petroleum Institute, Abu Dhabi, UAE
  • 5 Department of Chemistry, Faculty of Science, University Putra Malaysia (UPM), 43400 Serdang, Malaysia
Talanta, 2015 Nov 1;144:908-14.
PMID: 26452907 DOI: 10.1016/j.talanta.2015.07.050

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.

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