Determination of anthracene on Ag-Au alloy nanoparticles/overoxidized-polypyrrole composite modified glassy carbon electrodes
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Date
2010
Journal Title
Journal ISSN
Volume Title
Publisher
MDPI
Abstract
A novel electrochemical sensor for the detection of anthracene was prepared by
modifying a glassy carbon electrode (GCE) with over-oxidized polypyrrole (PPyox) and
Ag-Au (1:3) bimetallic nanoparticles (Ag-AuNPs). The composite electrode
(PPyox/Ag-AuNPs/GCE) was prepared by potentiodynamic polymerization of pyrrole on
GCE followed by its overoxidation in 0.1 M NaOH. Ag-Au bimetallic nanoparticles were
chemically prepared by the reduction of AgNO3 and HAuCl4 using C6H5O7Na3 as the
reducing agent as well as the capping agent and then immobilized on the surface of the
PPyox/GCE. The nanoparticles were characterized by UV-visible spectroscopy technique
which confirmed the homogeneous formation of the bimetallic alloy nanoparticles.
Transmission electron microscopy showed that the synthesized bimetallic nanoparticles
were in the range of 20–50 nm. The electrochemical behaviour of anthracene at the
PPyox/Ag-AuNPs/GCE with Ag: Au atomic ratio 25:75 (1:3) exhibited a higher
electrocatalytic effect compared to that observed when GCE was modified with each
constituent of the composite (i.e., PPyox, Ag-AuNPs) and bare GCE. A linear relationship
between anodic current and anthracene concentration was attained over the range
of 3.0 × 10−6 to 3.56 × 10−4 M with a detection limit of 1.69 × 10−7 M. The proposed
method was simple, less time consuming and showed a high sensitivity.
Description
Keywords
Overoxidized-polypyrrole, Bimetallic alloy nanoparticles, Anthracene, Electrocatalytic effect, Transmission electron microscopy
Citation
Mailu, S.N. et al. (2010). Determination of anthracene on Ag-Au alloy nanoparticles/overoxidized-polypyrrole composite modified glassy carbon electrodes. Sensors, 10: 9449-9465