Sensors based on porous Pd-doped hematite (α-Fe2O 3) for LPG detection

G. Picasso, M. R. Sun Kou, O. Vargasmachuca, J. Rojas, C. Zavala, A. Lopez, S. Irusta

Producción científica: Contribución a una revistaArtículorevisión exhaustiva

26 Citas (Scopus)

Resumen

In this work, sensors based on nanoparticles of α-Fe 2O3 doped with different amounts of Pd ranging from 0.1 to 1.0 wt.% were prepared by coprecipitation for liquefied petroleum gas (LPG) detection. Solids were characterized by thermogravimetric and differential thermal analysis (TG-DTA), X-ray diffraction (XRD), adsorption-desorption of N2 (BET surface), transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS). Sample tests of Pd-doped sensors showed much higher sensitivity than the undoped one revealing the promotion electronic effect of Pd2+ on the surface reaction. Among all samples, the sensor with 0.75 wt.% Pd presented the highest gas response at 300 C in all gas tested concentrations, likely due to the highest BET surface, well-defined hematite crystalline structure and best surface contact over Pd surface via electronic mechanism.

Idioma originalInglés
Páginas (desde-hasta)79-85
Número de páginas7
PublicaciónMicroporous and Mesoporous Materials
Volumen185
DOI
EstadoPublicada - 1 feb. 2014

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