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

doi:10.1016/j.talanta.2015.07.050

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

Talanta. 2015 Nov 1:144:908-14. doi: 10.1016/j.talanta.2015.07.050. Epub 2015 Jul 17.

Authors

Nurul Izrini Ikhsan¹, Perumal Rameshkumar², Alagarsamy Pandikumar², Muhammad Mehmood Shahid², Nay Ming Huang³, Swadi Vijay Kumar⁴, Hong Ngee Lim⁵

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.

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.

Keywords: Electrochemical sensor; Graphene oxide; Nanocomposite; Nitrite; Silver nanoparticles.