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Some sensors based on pure α-Fe2O3 (hematite) and doped with %Pt-loadings (respect to oxide) of 0,1; 0,2 y 0,3% have been prepared by precipitation method for detection of methane, sodium carbonate as precipitating agent and polyethylene glycol (PEG) as antiagglomeration agent. The samples were characterized by X-ray diffraction (XRD), sorption of N2 (BET method) and transmission electron microscopy (TEM). The XRD patterns showed that the crystalline structure of starting iron oxide has not been affected by the introduction of Pt as doping material. All the sensors depicted micro-mesoporous isotherms corresponding to type IV. TEM micrographs showed the average particle size of samples, ranging from 50 to 150 nm. Sensor tests were performed in a range of concentrations from 300 to 900 ppm and operation temperatures between 150 and 400 oC. The sensor with 0,3% of Pt and 0,3% of PEG (20000) presented the highest gas response at 300oC with an initial concentration of 900 ppm of methane probably due to the well-defined hematite crystalline structure, good dispersion of nanoparticles and the best contact surface over Pt surface.

PREPARACIÓN DE SENSORES BASADOS EN ÓXIDO DE Fe DOPADOS CON Pt PARA LA DETECCIÓN DE METANO