Understanding the sensing mechanism of polyaniline resistive sensors. Effect of humidity on sensing of organic volatiles
Polyaniline (PANI) is the oldest and potentially one of the most useful conducting polymers. Among other technological applications, PANI films have been extensively used as resistive sensors of volatile analytes. However, at present the mechanism underlying the resistivity changes of the films upon...
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todo:paper_09254005_v210_n_p574_Cavallo2023-10-03T15:46:14Z Understanding the sensing mechanism of polyaniline resistive sensors. Effect of humidity on sensing of organic volatiles Cavallo, P. Acevedo, D.F. Fuertes, M.C. Soler-Illia, G.J.A.A. Barbero, C.A. Humidity Polyaniline Resistive sensor Atmospheric humidity Atomic force microscopy Chains Conducting polymers Electronic structure Ultraviolet visible spectroscopy Water absorption Electrical resistances Ellipsometric porosimetry Polyanilines (PAni) Resistive sensor Resistivity changes Technological applications UV visible spectroscopy Volatile substances Polyaniline Polyaniline (PANI) is the oldest and potentially one of the most useful conducting polymers. Among other technological applications, PANI films have been extensively used as resistive sensors of volatile analytes. However, at present the mechanism underlying the resistivity changes of the films upon exposure to volatile substances is still unclear. In this work, we investigate different effects of the volatile absorption which can cause the changes polymer electrical resistance when it acts as resistive sensor. This model takes into account three major components: (i) changes in the electronic structure of the polymeric chains (ΔRele), (ii) variations in the electron hopping process (ΔRhop) and (iii) changes in the ionic conductivity between chains due to changes in the dielectric medium between them (ΔRmed). Using two point probe resistivity, UV-visible spectroscopy, environmental ellipsometric porosimetry and atomic force microscopy we study the effect of volatiles on polyaniline films properties to improve the understanding on the mechanism of resistivity changes. Specifically, in the case of water absorption, the resistivity changes seem to be associated with dielectric medium changes and swelling effects (in the high humidity range). It is found that ambient humidity not only gives a resistive signal but also strongly affect the sensing of other volatiles (e.g. ethanol). © 2015 Elsevier B.V. Fil:Soler-Illia, G.J.A.A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_09254005_v210_n_p574_Cavallo |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Humidity Polyaniline Resistive sensor Atmospheric humidity Atomic force microscopy Chains Conducting polymers Electronic structure Ultraviolet visible spectroscopy Water absorption Electrical resistances Ellipsometric porosimetry Polyanilines (PAni) Resistive sensor Resistivity changes Technological applications UV visible spectroscopy Volatile substances Polyaniline |
| spellingShingle |
Humidity Polyaniline Resistive sensor Atmospheric humidity Atomic force microscopy Chains Conducting polymers Electronic structure Ultraviolet visible spectroscopy Water absorption Electrical resistances Ellipsometric porosimetry Polyanilines (PAni) Resistive sensor Resistivity changes Technological applications UV visible spectroscopy Volatile substances Polyaniline Cavallo, P. Acevedo, D.F. Fuertes, M.C. Soler-Illia, G.J.A.A. Barbero, C.A. Understanding the sensing mechanism of polyaniline resistive sensors. Effect of humidity on sensing of organic volatiles |
| topic_facet |
Humidity Polyaniline Resistive sensor Atmospheric humidity Atomic force microscopy Chains Conducting polymers Electronic structure Ultraviolet visible spectroscopy Water absorption Electrical resistances Ellipsometric porosimetry Polyanilines (PAni) Resistive sensor Resistivity changes Technological applications UV visible spectroscopy Volatile substances Polyaniline |
| description |
Polyaniline (PANI) is the oldest and potentially one of the most useful conducting polymers. Among other technological applications, PANI films have been extensively used as resistive sensors of volatile analytes. However, at present the mechanism underlying the resistivity changes of the films upon exposure to volatile substances is still unclear. In this work, we investigate different effects of the volatile absorption which can cause the changes polymer electrical resistance when it acts as resistive sensor. This model takes into account three major components: (i) changes in the electronic structure of the polymeric chains (ΔRele), (ii) variations in the electron hopping process (ΔRhop) and (iii) changes in the ionic conductivity between chains due to changes in the dielectric medium between them (ΔRmed). Using two point probe resistivity, UV-visible spectroscopy, environmental ellipsometric porosimetry and atomic force microscopy we study the effect of volatiles on polyaniline films properties to improve the understanding on the mechanism of resistivity changes. Specifically, in the case of water absorption, the resistivity changes seem to be associated with dielectric medium changes and swelling effects (in the high humidity range). It is found that ambient humidity not only gives a resistive signal but also strongly affect the sensing of other volatiles (e.g. ethanol). © 2015 Elsevier B.V. |
| format |
JOUR |
| author |
Cavallo, P. Acevedo, D.F. Fuertes, M.C. Soler-Illia, G.J.A.A. Barbero, C.A. |
| author_facet |
Cavallo, P. Acevedo, D.F. Fuertes, M.C. Soler-Illia, G.J.A.A. Barbero, C.A. |
| author_sort |
Cavallo, P. |
| title |
Understanding the sensing mechanism of polyaniline resistive sensors. Effect of humidity on sensing of organic volatiles |
| title_short |
Understanding the sensing mechanism of polyaniline resistive sensors. Effect of humidity on sensing of organic volatiles |
| title_full |
Understanding the sensing mechanism of polyaniline resistive sensors. Effect of humidity on sensing of organic volatiles |
| title_fullStr |
Understanding the sensing mechanism of polyaniline resistive sensors. Effect of humidity on sensing of organic volatiles |
| title_full_unstemmed |
Understanding the sensing mechanism of polyaniline resistive sensors. Effect of humidity on sensing of organic volatiles |
| title_sort |
understanding the sensing mechanism of polyaniline resistive sensors. effect of humidity on sensing of organic volatiles |
| url |
http://hdl.handle.net/20.500.12110/paper_09254005_v210_n_p574_Cavallo |
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