Journal
ELECTROANALYSIS
Volume 23, Issue 9, Pages 2164-2173Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/elan.201100105
Keywords
Polypyrrole; Copper nanoparticles; Multiwall carbon nanotubes; Nitrate sensing
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Funding
- Environmental Protection Agency Ireland
- Irish Government
- Science Foundation Ireland through the Tyndall National Institute
- University College Cork
- Research Frontiers Programme [08/RFP/MTR1261]
- Science Foundation Ireland (SFI) [08/RFP/MTR1261] Funding Source: Science Foundation Ireland (SFI)
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Metallic copper nanoparticles (CuNP) are formed from the reduction of hierarchical copper-based micro/nanostructures previously electrodeposited on polypyrrole-polystyrene sulfonate (PPy-PSS) thin films. The application of a high reduction potential causes the erosion of the micro/nanostructures nanosheets and the formation of CuNP. The CuNP are used in a series of preliminary tests in order to assess their performance in the sensing of nitrate. The sensing performance is improved with the introduction of polyethyleneimine-functionalized multiwall carbon nanotubes (MWNT-PEI) to the PPy-PSS films. Electrochemical impedance spectroscopy studies show that the nanotubes increased the electronic conductivity of the reduced films. The limit of detection of the PPy-PSS-MWNT-PEI-CuNP nanocomposite is 30 mu M nitrate. The materials need further development and optimization work in order to be applied as sensors.
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