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Preparation of highly water dispersible functional graphene/silver nanocomposite for the detection of melamine


Kumar, S. Vijay and Huang, Nay Ming and Lim, Hong Ngee and Zainy, Mazlinda and Harrison, Ian and Chia, Chin Hua (2013) Preparation of highly water dispersible functional graphene/silver nanocomposite for the detection of melamine. Sensors and Actuators B: Chemical, 181. pp. 885-893. ISSN 0925-4005; ESSN: 1873-3077


A stable aqueous suspension of a functional graphene/silver (FG/Ag) nanocomposite was prepared by an environmentally friendly hydrothermal method. The precursor, functional graphene oxide (FGO), was prepared by covalent functionalisation of graphene oxide (GO) with a hydrophilic organosilane, N-(trimethoxysilylpropyl) ethylenediaminetriacetic acid trisodium salt (TETA). The attachment of functional groups on the GO surface maintained the aqueous stability of the FG/Ag nanocomposite even after the hydrothermal reduction. Field emission scanning electron microscopy (FESEM) images illustrated a uniform distribution of Ag nanoparticles on the FG surface. The surface enhanced Raman spectroscopy (SERS) activity of the nanocomposite was investigated using p-aminothiophenol (p-ATP) and melamine which can be detected as low as 2 × 10−8 and 2 × 10−7 M, respectively. The impressive water stability and the high SERS sensitivity of the FG/Ag nanocomposite make it a suitable substrate for trace analysis of a variety of drugs, additives or organic contaminants in water. The nanocomposite also showed a positive inhibition effect against the growth of Escherichia coli bacteria, eliminating the possibility of bacterial contamination of the sensor, thus prolonging the shelf-life of the sensing device.

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Additional Metadata

Item Type: Article
Divisions: Faculty of Science
Institute of Advanced Technology
DOI Number: https://doi.org/10.1016/j.snb.2013.02.045
Publisher: Elsevier
Keywords: Nano composites; Nano particles; Raman spectroscopy; Graphene
Depositing User: Umikalthom Abdullah
Date Deposited: 18 Jun 2014 00:34
Last Modified: 21 Mar 2016 09:09
Altmetrics: http://www.altmetric.com/details.php?domain=psasir.upm.edu.my&doi=10.1016/j.snb.2013.02.045
URI: http://psasir.upm.edu.my/id/eprint/30022
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