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Vol. 146, No. 11, November 2012, pp. 170-181




Zinc and Pyrrole-added Akaganeite (β-FeOOH) Films by Ultrasonic Spray Pyrolisis Assessed as Propane Sensors

CINVESTAV, Departamento de Ingeniería Eléctrica, Sección de Electrónica del Estado Sólido,

Av. Instituto Politecnico Nacional 2508, Col. San Pedro Zacatenco, México 07360, D.F., México

Tel.: 57473800 ext. 6259, fax 57473800 ext. 6266

E-mail: aavila@cinvestav.mx



Received: 11 September 2012   /Accepted: 23 November 2012   /Published: 30 November 2012

Digital Sensors and Sensor Sysstems


Abstract: β-FeOOH films were grown by ultrasonic spray pyrolisis from a 0.05M methanolic solution of FeCl3∙6H2O containing (CH3COO)2Zn∙2H2O, added with distinct amounts of pyrrole monomer (0, 0.014 ml and 2.5 ml). Films were grown at low substrate temperatures to preserve the organic component in the film. They were characterized by using x-rays diffraction (XRD), infrared spectroscopy (FTIR), and atomic force microscopy (AFM). To assess their sensing capabilities, impedance spectroscopy (IS) was used. Results indicate that at low substrate temperature (approximately ≤ 150 ºC) the films keep both, organic and akaganeite composition but the largest (2.5 ml) amount of pyrrole clearly produces a polypyrrole-akaganeite composite. Zinc acetate was not completely decomposed at the low deposition temperatures used. The electrical measurements were made under different atmospheres such as dry air, humid air and humid air-propane (500 ppm) at 30 ºC and 50 ºC. A better response towards humidity (~ 100 %) and propane (~ 1000 %) was obtained from akaganeite films at both temperatures. Lower but not negligible responses (10-40 % for humidity and 20-30 % for propane) were found from Ppy-akaganeite films


Keywords: Polypyrrole (Ppy), Akaganeite, Sensors, Ultrasonic spray pyrolisis



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