Decoration of carbon nanotubes with gold nanoparticles by electroless deposition process using ethylenediamine as a cros
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Nor Azah Yusof a) Department of Chemistry, Faculty of Science, Universiti Putra Malaysia, Serdang 43400, Selangor, Malaysia; and Institute of Advanced Technology, Universiti Putra Malaysia, Serdang 43400, Selangor, Malaysia
Reza Hajianb) Institute of Advanced Technology, Universiti Putra Malaysia, Serdang 43400, Selangor, Malaysia
Jaafar Abdullah Department of Chemistry, Faculty of Science, Universiti Putra Malaysia, Serdang 43400, Selangor, Malaysia; and Institute of Advanced Technology, Universiti Putra Malaysia, Serdang 43400, Selangor, Malaysia (Received 11 March 2016; accepted 8 August 2016)
Herein, we present a method for decorating multi-walled carbon nanotubes (MWCNTs) with gold nanoparticles (AuNPs) using ethylenediamine (en) as a linker between MWCNTs and AuNPs. The amine group in en is as growth points for synthesis of AuNPs through electrostatic attraction between the amine groups and AuCl 4 anion while sodium citrate act as reducing agent. The influence of HAuCl4 concentration on the size and distribution of AuNPs in the structure of the Au-decorated nanotubes were investigated. Morphology of the decorated nanotubes was characterized by field emission scanning electron microscopy and transmission electron microscopy while the elemental composition of the decorated tubes and crystallography were investigated by energy dispersive x-ray, x-ray diffraction, Raman spectroscopy, and Fourier transform infrared techniques. Cyclic voltammetric and electrochemical impedance spectroscopic analysis revealed that the Au-decorated nanotubes have increased the electro-active surface area and conductivity of electrochemical substrate. I. INTRODUCTION
Carbon nanotubes (CNTs) both single and multi-walled represent one of the best examples of novel nanostructures1 with many unique physical and chemical properties that have been increasingly explored for biological and biomedical applications2 due mainly to their extremely small size, uniform pore distribution and large specific surface area3 with ability to hold the potential for long range of applications,4 reduction of over-potential and resistance to surface fouling during electrochemical analysis.5 These remarkable properties of CNTs can be improved further by the addition of metal nanoparticles (NPs).6 The combination of the two classes of materials (CNTs and metal-NPs) may lead to a successful integration of the properties of the two components in the new nanohybrid which present better features for catalysis and nanotechnology.7 Decoration of CNTs with metal-NPs has been exploited to enhance the sensitivity of the material toward detection of analyte.8 CNTs-metal-NPs have been shown to act as transduction
Contributing Editor: Mauricio Terrones Address all correspondence to these authors. a) e-mail: [email protected] b) e-mail: [email protected] DOI: 10.1557/jmr.2016.304
unit of the adsorption event in a resistive sensor.9 One of the most commonly used metal-NPs that captured the interest of researchers in this aspects are gold nanoparticles (AuNPs) which ha
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