Artículo
Impedance spectroscopy analysis of TiO2 thin film gas sensors obtained from water-based anatase colloids
Ponce, Miguel Adolfo
; Parra, Rodrigo
; Savu, Raluca; Joanni, Ednan; Bueno, Paulo; Cilense, Mario; Varela, José A.; Castro, Miriam Susana
Fecha de publicación:
04/2009
Editorial:
Elsevier Science Sa
Revista:
Sensors and Actuators B: Chemical
ISSN:
0925-4005
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
In this work impedance spectroscopy technique was employed in order to characterize the gas-sensing behavior of undoped titanium dioxide (TiO2) polycrystalline thin films. The electrical measurements were performed in a sensor-testing chamber that allows independent control of temperature, pressure, gas composition and flow rate. Frequency measurements, in the range from 40 Hz to 110 MHz, were performed in order to evaluate the gas sensor response of the samples as a function of temperature (50–350 °C) and surrounding atmosphere (vacuum or air at atmospheric pressure). Impedance spectroscopy is a very useful and important technique due to the possibility of using this method for discriminating between grain boundary capacitance (Cgb) and grain boundary resistance (Rgb) contributions. Therefore, a simple model taking into account variations in the intergranular potential barriers is proposed in this work.
Palabras clave:
Titanium Oxide
,
Thin Films
,
Gas Sensor
,
Impedance Spectroscopy
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Articulos(INTEMA)
Articulos de INST.DE INV.EN CIENCIA Y TECNOL.MATERIALES (I)
Articulos de INST.DE INV.EN CIENCIA Y TECNOL.MATERIALES (I)
Citación
Ponce, Miguel Adolfo; Parra, Rodrigo; Savu, Raluca; Joanni, Ednan; Bueno, Paulo; et al.; Impedance spectroscopy analysis of TiO2 thin film gas sensors obtained from water-based anatase colloids; Elsevier Science Sa; Sensors and Actuators B: Chemical; 139; 4-2009; 447-452
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