期刊
SENSORS
卷 10, 期 10, 页码 9449-9465出版社
MDPI
DOI: 10.3390/s101009449
关键词
overoxidized-polypyrrole; bimetallic alloy nanoparticles; anthracene; electrocatalytic effect; composite; transmission electron microscopy
资金
- National Research Foundation (NRF)
- Department of Science and Technology of the Republic of South Africa
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 x 10(-6) to 3.56 x 10(-4) M with a detection limit of 1.69 x 10(-7) M. The proposed method was simple, less time consuming and showed a high sensitivity.
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