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

S. Vijay Kumar, N. M. Huang, H. N. Lim, M. Zainy, I. Harrison, Chin Hua Chia

Research output: Contribution to journalArticle

47 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)885-893
Number of pages9
JournalSensors and Actuators, B: Chemical
Volume181
DOIs
Publication statusPublished - 2013

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melamine
Melamine
Graphite
Silver
Graphene
Nanocomposites
nanocomposites
graphene
silver
preparation
Water
Oxides
water
oxides
Raman spectroscopy
Trace analysis
Escherichia
Field emission
Escherichia coli
bacteria

Keywords

  • Graphene
  • Nano composites
  • Nano particles
  • Raman spectroscopy

ASJC Scopus subject areas

  • Instrumentation
  • Materials Chemistry
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

Cite this

Preparation of highly water dispersible functional graphene/silver nanocomposite for the detection of melamine. / Kumar, S. Vijay; Huang, N. M.; Lim, H. N.; Zainy, M.; Harrison, I.; Chia, Chin Hua.

In: Sensors and Actuators, B: Chemical, Vol. 181, 2013, p. 885-893.

Research output: Contribution to journalArticle

Kumar, S. Vijay ; Huang, N. M. ; Lim, H. N. ; Zainy, M. ; Harrison, I. ; Chia, Chin Hua. / Preparation of highly water dispersible functional graphene/silver nanocomposite for the detection of melamine. In: Sensors and Actuators, B: Chemical. 2013 ; Vol. 181. pp. 885-893.
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