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Enhancement of the gas sensing performance of carbon nanotube networked films based on their electrophoretic functionalization with gold nanoparticles

Published online by Cambridge University Press:  02 September 2015

E. Dilonardo
Affiliation:
Department of Chemistry, Università degli Studi di Bari Aldo Moro, Bari, Italy. Department of Electrotechnics and Electronics (DEE), Politecnico di Bari, Bari, Italy.
M. Penza
Affiliation:
ENEA, Italian National Agency for New Technologies, Energy and Sustainable Economic Development, Technical Unit for Materials Technologies - Brindisi Research Center, Brindisi, Italy
M. Alvisi
Affiliation:
ENEA, Italian National Agency for New Technologies, Energy and Sustainable Economic Development, Technical Unit for Materials Technologies - Brindisi Research Center, Brindisi, Italy
C. Di Franco
Affiliation:
CNR-IFN Bari, Bari, Italy
D. Suriano
Affiliation:
ENEA, Italian National Agency for New Technologies, Energy and Sustainable Economic Development, Technical Unit for Materials Technologies - Brindisi Research Center, Brindisi, Italy
R. Rossi
Affiliation:
ENEA, Italian National Agency for New Technologies, Energy and Sustainable Economic Development, Technical Unit for Materials Technologies - Brindisi Research Center, Brindisi, Italy
F. Palmisano
Affiliation:
Department of Chemistry, Università degli Studi di Bari Aldo Moro, Bari, Italy.
L. Torsi
Affiliation:
Department of Chemistry, Università degli Studi di Bari Aldo Moro, Bari, Italy.
N. Cioffi
Affiliation:
Department of Chemistry, Università degli Studi di Bari Aldo Moro, Bari, Italy.
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Abstract

Controlled amounts of colloidal Au nanoparticles (NPs), electrochemically pre-synthesized, were directly deposited on MWCNTs sensor devices by electrophoresis. Pristine and Au-functionalized MWCNT networked films were tested as active layers in resistive gas sensors for detection of pollutant gases. Au-modified CNT-chemiresistor demonstrated higher sensitivity to NO2 detecting up to sub-ppm level compared to pristine one. The investigation of the cross-sensitivity towards other pollutant gases revealed the decrease of the sensitivity to NO2 with the increase of Au content, and, on the other side, the increase of that to H2S; therefore the fine tune of the metal loading on CNTs has allowed to control not only the gas sensitivity but also the selectivity towards a specific gaseous analyte. Finally, the sensing properties of Au-decorated CNT sensor seem to be promising in environmental and automotive gas sensing applications, based on low power consumption and moderate operating temperature.

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Articles
Copyright
Copyright © Materials Research Society 2015 

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References

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Enhancement of the gas sensing performance of carbon nanotube networked films based on their electrophoretic functionalization with gold nanoparticles
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