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Abstract:

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.

Registro:

Documento: Artículo
Título:Understanding the sensing mechanism of polyaniline resistive sensors. Effect of humidity on sensing of organic volatiles
Autor:Cavallo, P.; Acevedo, D.F.; Fuertes, M.C.; Soler-Illia, G.J.A.A.; Barbero, C.A.
Filiación:Departamento de Química, Universidad Nacional de Río Cuarto, Ruta Nacional 36 km 601, Río Cuarto, Córdoba, X5804ZAB, Argentina
Gerencia de Química, Centro Atómico Constituyentes, CNEA, Buenos Aires, Argentina
Instituto Sabato, Universidad Nacional de San Martín, CNEA, Buenos Aires, Argentina
Departamento de Química Inorgánica, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires, C1428EHA, Argentina
Departamento de Tecnología Química, Facultad de Ingenieria, Universidad Nacional de Río Cuarto, Ruta Nacional 36 km 601, Río Cuarto, Córdoba, X5804ZAB, Argentina
Palabras clave: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
Año:2015
Volumen:210
Página de inicio:574
Página de fin:580
DOI: http://dx.doi.org/10.1016/j.snb.2015.01.029
Título revista:Sensors and Actuators, B: Chemical
Título revista abreviado:Sens Actuators, B Chem
ISSN:09254005
CODEN:SABCE
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09254005_v210_n_p574_Cavallo

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Citas:

---------- APA ----------
Cavallo, P., Acevedo, D.F., Fuertes, M.C., Soler-Illia, G.J.A.A. & Barbero, C.A. (2015) . Understanding the sensing mechanism of polyaniline resistive sensors. Effect of humidity on sensing of organic volatiles. Sensors and Actuators, B: Chemical, 210, 574-580.
http://dx.doi.org/10.1016/j.snb.2015.01.029
---------- CHICAGO ----------
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" . Sensors and Actuators, B: Chemical 210 (2015) : 574-580.
http://dx.doi.org/10.1016/j.snb.2015.01.029
---------- MLA ----------
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" . Sensors and Actuators, B: Chemical, vol. 210, 2015, pp. 574-580.
http://dx.doi.org/10.1016/j.snb.2015.01.029
---------- VANCOUVER ----------
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. Sens Actuators, B Chem. 2015;210:574-580.
http://dx.doi.org/10.1016/j.snb.2015.01.029