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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 ,
M. Penza ,
M. Alvisi ,
C. Di Franco ,
D. Suriano ,
R. Rossi ,
F. Palmisano ,
L. Torsi  and
N. Cioffi
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.
*
*Corresponding authors: Elena Dilonardo (elena.dilonardo@uniba.it), Michele Penza (michele.penza@enea.it), Nicola Cioffi (nicola.cioffi@uniba.it).
*Corresponding authors: Elena Dilonardo (elena.dilonardo@uniba.it), Michele Penza (michele.penza@enea.it), Nicola Cioffi (nicola.cioffi@uniba.it).
*Corresponding authors: Elena Dilonardo (elena.dilonardo@uniba.it), Michele Penza (michele.penza@enea.it), Nicola Cioffi (nicola.cioffi@uniba.it).
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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.

Keywords

sensorsurface chemistryelectrodeposition
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1786: Symposium T – Graphene and Carbon Nanotubes , 2015 , pp. 37 - 42
Copyright
Copyright © Materials Research Society 2015 

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References

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