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

SENSORS AND ACTUATORS B-CHEMICAL

卷:181

Article

Kumar, S. Vijay¹  Huang, N. M.¹  Lim, H. N.^2,3  Zainy, M.¹  Harrison, I.⁴  Chia, C. H.⁵ 

[1] Univ Malaya, Fac Sci, Low Dimens Mat Res Ctr, Dept Phys, Kuala Lumpur 50603, Malaysia

[2] Univ Putra Malaysia, Fac Sci, Dept Chem, Upm Serdang 43400, Selangor, Malaysia

[3] Univ Putra Malaysia, Inst Adv Technol, Funct Device Lab, Upm Serdang 43400, Selangor, Malaysia

[4] Univ Nottingham, Fac Engn, Sch Chem & Environm Engn, Semenyih 43500, Selangor, Malaysia

[5] Univ Kebangsaan Malaysia, Fac Sci & Technol, Sch Appl Phys, Bandar Baru Bangi 43600, Selangor, Malaysia

关键词: Nano composites;    Nano particles;    Raman spectroscopy;    Graphene;   

DOI  :  10.1016/j.snb.2013.02.045

来源: Elsevier

【 摘 要 】

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 x 10(-8) and 2 x 10(-7) M, respectively. The impressive water stability and the high SEAS 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. (c) 2013 Elsevier B.V. All rights reserved.

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