Synthesis, characterization, and sensitivity tests of La0.8Ba0.1Bi0.1FeO3 nanoparticles towards a few parts-per-billion of acetone gas
E.M. Benali,
L. Saher,
A. Benali,
M. Bejar,
E. Dhahri,
Jiangtao Wu,
Lin Peng,
P.M. Gordo,
J. Pina,
B.F.O. Costa
Affiliations
E.M. Benali
Laboratoire de Physique Appliquée, Faculté des Sciences, Université de Sfax, B.P. 1171, 3000, Sfax, Tunisia; University of Coimbra, CFisUC, Physics Department, Rua Larga, P-3004-516, Coimbra, Portugal
L. Saher
Centre de Recherche Scientifique et Technique en Analyses Physico-Chimiques, CRAPC, BP384, Bou-Ismail, 42004, Tipaza, Algeria
A. Benali
Laboratoire de Physique Appliquée, Faculté des Sciences, Université de Sfax, B.P. 1171, 3000, Sfax, Tunisia; University of Coimbra, CFisUC, Physics Department, Rua Larga, P-3004-516, Coimbra, Portugal; I3N and Physics Department, University of Aveiro, 3810-193, Aveiro, Portugal; Corresponding author. Laboratoire de Physique Appliquée, Faculté des Sciences, Université de Sfax, B.P. 1171, 3000, Sfax, Tunisia.
M. Bejar
Laboratoire de Physique Appliquée, Faculté des Sciences, Université de Sfax, B.P. 1171, 3000, Sfax, Tunisia; Faculté des Sciences de Monastir, Université de Monastir, Avenue de l’Environnement, 5019, Monastir, Tunisia
E. Dhahri
Laboratoire de Physique Appliquée, Faculté des Sciences, Université de Sfax, B.P. 1171, 3000, Sfax, Tunisia
Jiangtao Wu
College of Chemistry and Materials Science, Sichuan Normal University, Chengdu, 610068, China
Lin Peng
College of Chemistry and Materials Science, Sichuan Normal University, Chengdu, 610068, China
P.M. Gordo
University of Coimbra, CFisUC, Physics Department, Rua Larga, P-3004-516, Coimbra, Portugal
J. Pina
University of Coimbra, CQC-IMS, Department of Chemistry, Rua Larga, 3004-535, Coimbra, Portugal
B.F.O. Costa
University of Coimbra, CFisUC, Physics Department, Rua Larga, P-3004-516, Coimbra, Portugal; Corresponding author.
In the present paper, the La0.8Ba0.1Bi0.1FeO3 powders were synthesized via the auto-combustion method. The optical, the positron annihilation spectroscopy and the gas sensing properties of our sample were investigated simultaneously. FTIR spectrum revealed the antisymmetric deformation vibrations of the Fe–O and Fe–O–Fe bonds inside the octahedron FeO6. The optical bandgap (Egap) of the La0.8Ba0.1Bi0.1FeO3 compound was found to be equal to 2.23 eV. We confirmed by the positron annihilation studies, the existence of open volume defects and vacancy sized defects, at the grain/interfaces between vacancy clusters and grains at the interfaces intersection (triple-lines). Notably, the La0.8Ba0.1Bi0.1FeO3 perovskite exhibits an excellent response toward acetone gas, with ultra-fast response and recovery times to some parts-per-billion (ppb) of this tested gas.
