Resumo

TORRES FRAUSTO, Carlos  e  AVILA GARCIA, Alejandro. Pyrrole-added Fe₂O₃ films by ultrasonic spray pyrolisis. Superf. vacío [online]. 2009, vol.22, n.4, pp.15-19. ISSN 1665-3521.

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.

Palavras-chave : Composite films; Polypyrrole and iron oxide; Ultrasonic spray pyrolisis.

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