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; C. H. Chia

doi:10.1016/j.snb.2013.02.045

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, C. H. Chia

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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 language	British English
Pages (from-to)	885-893
Number of pages	9
Journal	Sensors and Actuators, B: Chemical
Volume	181
DOIs	https://doi.org/10.1016/j.snb.2013.02.045
State	Published - 2013

Keywords

Graphene
Nano composites
Nano particles
Raman spectroscopy

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10.1016/j.snb.2013.02.045

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title = "Preparation of highly water dispersible functional graphene/silver nanocomposite for the detection of melamine",

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.",

keywords = "Graphene, Nano composites, Nano particles, Raman spectroscopy",

author = "Kumar, {S. Vijay} and Huang, {N. M.} and Lim, {H. N.} and M. Zainy and I. Harrison and Chia, {C. H.}",

note = "Funding Information: This work was financially supported by a High Impact Research Grant from the University of Malaya ( UM.C/625/1/HIR/030 ), a High Impact Research Grant from the Ministry of Higher Education Malaysia ( UM.C/625/1/HIR/MOHE/05 ) and a Postgraduate Research Grant from the University of Malaya (UM.C/241/9). ",

year = "2013",

doi = "10.1016/j.snb.2013.02.045",

language = "British English",

volume = "181",

pages = "885--893",

journal = "Sensors and Actuators, B: Chemical",

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T1 - Preparation of highly water dispersible functional graphene/silver nanocomposite for the detection of melamine

AU - Kumar, S. Vijay

AU - Huang, N. M.

AU - Lim, H. N.

AU - Zainy, M.

AU - Harrison, I.

AU - Chia, C. H.

N1 - Funding Information: This work was financially supported by a High Impact Research Grant from the University of Malaya ( UM.C/625/1/HIR/030 ), a High Impact Research Grant from the Ministry of Higher Education Malaysia ( UM.C/625/1/HIR/MOHE/05 ) and a Postgraduate Research Grant from the University of Malaya (UM.C/241/9).

PY - 2013

Y1 - 2013

N2 - 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.

AB - 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.

KW - Graphene

KW - Nano composites

KW - Nano particles

KW - Raman spectroscopy

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SN - 0925-4005

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JO - Sensors and Actuators, B: Chemical

JF - Sensors and Actuators, B: Chemical

ER -

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

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