Pyrrole–added Fe₂O₃ films by ultrasonic spray pyrolisis

Carlos Torres Frausto, Alejandro Avila Garcia*

CINVESTAV del IPN, Departamento de Ingeniería Eléctrica, Sección de Electrónica del Estado Sólido, México 07360, D. F., México. E–mail: *aavila@cinvestav.mx

Recibido: 26 de agosto de 2009.
Aceptado: 30 de octubre de 2009.

Abstract

Fe₂O₃ thin films were grown by Ultrasonic Spray Pyrolisis from a 0.05 aqueous solution of FeCl₃ added with a small amount of pyrrole monomer. Films at different substrate temperature and pyrrole content were grown. They were characterized by using x–ray diffraction (XRD), infrared spectroscopy (FTIR) and atomic force microscopy (AFM). Results indicated that at low substrate temperature (approximately < 200°C) the films mainly resemble the polypyrrole structure. At higher temperatures up to 400°C the trend is to form the hematite phase (Fe₂O₃) of iron oxide. Furthermore, the surface morphology exhibits nano–size features, which can be changed by using different pyrrole contents. This last feature could be useful for usage of the film as a gas sensor.

Keywords: Composite films; Polypyrrole and iron oxide; Ultrasonic spray pyrolisis.

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