期刊
MICROPOROUS AND MESOPOROUS MATERIALS
卷 185, 期 -, 页码 79-85出版社
ELSEVIER
DOI: 10.1016/j.micromeso.2013.11.014
关键词
Gas sensor; Pd-doped alpha-Fe2O3; LPG detection
类别
资金
- CONCYTEC [371-2012-CONCYTEC-OAJ]
- National University of Engineering-Faculty of Sciences
- IGI-Institute of Research of National University of Engineering (Project IGI)
- DGI-PUCP, Research Center of Pontifical Catholic University of Peru [DGI 2010-0003]
In this work, sensors based on nanoparticles of alpha-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 N-2 (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 degrees 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. (C) 2013 Elsevier Inc. All rights reserved.
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