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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Autor principal: Soler Illia, Galo Juan de Avila Arturo
Publicado: 2015
Materias:
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)
Resistivity changes
Technological applications
UV visible spectroscopy
Volatile substances
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09254005_v210_n_p574_Cavallo
http://hdl.handle.net/20.500.12110/paper_09254005_v210_n_p574_Cavallo
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_09254005_v210_n_p574_Cavallo
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spelling paper:paper_09254005_v210_n_p574_Cavallo2023-06-08T15:51:18Z Understanding the sensing mechanism of polyaniline resistive sensors. Effect of humidity on sensing of organic volatiles Soler Illia, Galo Juan de Avila Arturo 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. 2015 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09254005_v210_n_p574_Cavallo 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
collection 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
Soler Illia, Galo Juan de Avila Arturo
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.
author Soler Illia, Galo Juan de Avila Arturo
author_facet Soler Illia, Galo Juan de Avila Arturo
author_sort Soler Illia, Galo Juan de Avila Arturo
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
publishDate 2015
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09254005_v210_n_p574_Cavallo
http://hdl.handle.net/20.500.12110/paper_09254005_v210_n_p574_Cavallo
work_keys_str_mv AT solerilliagalojuandeavilaarturo understandingthesensingmechanismofpolyanilineresistivesensorseffectofhumidityonsensingoforganicvolatiles
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