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

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Picasso G.
Sun Kou M.R.
Vargasmachuca O.
Rojas J.
Zavala C.
Lopez A.
Irusta S.
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Elsevier B.V.
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In this work, sensors based on nanoparticles of α-Fe2O3 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.
The authors gratefully acknowledge the financial support for this work provided by CONCYTEC (Project 371-2012-CONCYTEC-OAJ),
Palabras clave
Pd-doped α-Fe2O3, Gas sensor, LPG detection