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Preparation and Gas Sensing Characteristics of Nanoparticulate p‐Type Semiconducting LnFeO 3 and LnCrO 3 Materials
Author(s) -
Siemons M.,
Leifert A.,
Simon U.
Publication year - 2007
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.200600454
Subject(s) - materials science , scanning electron microscope , characterization (materials science) , spectroscopy , perovskite (structure) , dielectric spectroscopy , diffraction , semiconductor , nanotechnology , analytical chemistry (journal) , chemical engineering , electrode , electrochemistry , optoelectronics , chemistry , composite material , optics , organic chemistry , physics , quantum mechanics , engineering
Nanoparticulate perovskite‐type LnBO 3 (Ln = La, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu; B = Cr, Fe) oxides are prepared by polyol‐mediated synthesis. X‐ray diffraction is used to confirm the structure of the materials, and scanning electron microscopy is applied to image the sample morphology. The powders are used for the preparation of suspensions that are deposited as thick films on comb‐type Pt electrodes on alumina substrates. Electrical characterization is performed by using high‐throughput impedance spectroscopy. The materials exhibit p‐type semiconductor behavior, and their sensitivity towards H 2 , CO, NO, NO 2 , and propylene in a temperature range from 200 to 500 °C is analyzed. In addition, the time‐resolved response of the LnFeO 3 materials is investigated. A correlation between the Ln–O binding energy and the sensing properties is observed.