Structural, electrical and ethanol sensing properties of double-doping LaFeO3 perovskite oxides

Benali, A.; Azizi, Samir; Bejar, M.; Dhahri, E.; Graça, M.F.P.

doi:10.1016/j.ceramint.2014.06.029

Cited by 89 publications

(23 citation statements)

References 43 publications

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“…At the same temperature, the resistance value increases along with increasing the concentration of ethanol gas. Since ethanol gas is a reducing gas 14,15 it is known that LaFeO 3 and Al 2 O 3 -dopped LaFeO 3 thick film ceramics has the characteristics as a p-type semiconductor (hole majority carrier) for materials with excess holes will react towards reduction with ethanol gas resulting in decreasing the gas flow characterized by an increased resistance of the material. The increase of the value of this resistance occurs because the more gas is adsorbed, the number of atoms/ions of oxygen in the thick film ceramics increases and the number of electrons decreases.…”

Section: The Sensitivity and The Sensor Mechanismmentioning

confidence: 99%

Synthesis and Characterization of Al2O3-Doped LaFeO3 Thick Film Ceramics for Ethanol Gas Sensing Application

Suhendi¹,

Lidiawati²,

Syarif³

et al. 2019

Orient. J. Chem

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Preparation and characterization of Al 2 O 3 -dopped LaFeO 3 thick film ceramics for ethanol gas sensor applications has been conducted. LaFeO 3 ceramics were made by co-precipitation method with doping variation of Al 2 O 3 0% and 3.75% mole of the main ingredients LaFeO 3 (La 2 O 3 and Fe 2 O 3 ). Screen printing technique was employed to make thick film ceramics of LaFeO 3 and Al 2 O 3 -dopped LaFeO 3 . The ceramics were calcined at temperature of 60 0 C. The analysis results of the characteristics of crystals using X-Ray Difraction (XRD) showed that the made ceramics made had cubic phase with a lattice parameter a=b=c=39.52nm. The addition of 3.75% mole of Al 2 O 3 did not change the crystal phase and lattice parameter values of LaFeO 3 . The crystallite size of LaFeO 3 was 52.17nm while the crystallite size of Al 2 O 3 -doped LaFeO 3 was 44.52nm. The analysis results of morphological structure ceramics of LaFeO 3 and Al 2 O 3 -doped LaFeO 3 using Scanning Electron Microscopy (SEM) possessed a grain size of each 0:40 μm and 0.25μm. The electrical characterization results of LaFeO 3 thick film ceramics indicated the sensitivity of the sensor increased along with the addition of ethanol gas concentration. The maximum sensitivity value of LaFeO 3 thick film ceramics ceramic thick film LaFeO 3 and Al 2 O 3 -doped LaFeO 3 at 300ppm was 4.34 at 330 0 C and 6.08 at 350 0 C. The thick film ceramics with the addition of 3.75% mole of Al 2 O 3 has a higher sensitivity and potential to be used as ethanol gas sensor.

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Section: The Sensitivity and The Sensor Mechanismmentioning

confidence: 99%

Synthesis and Characterization of Al2O3-Doped LaFeO3 Thick Film Ceramics for Ethanol Gas Sensing Application

Suhendi¹,

Lidiawati²,

Syarif³

et al. 2019

Orient. J. Chem

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“…19,20 Perovskites, which have the general formula ABO 3 , are materials of potential owing to their stability, magnetism, crystal structure, electrical conductivity and piezoelectric properties. These advantages give rise to applications in magnetoresistance devices, [21][22][23] as solid electrolytes, 24 as transducers [25][26][27][28] and in catalysis. [29][30][31][32] Many perovskite materials have good response in the ultraviolet region.…”

Section: Introductionmentioning

confidence: 99%

Photothermal catalytic activity of combustion synthesized LaCo_xFe_1−xO₃ (0 ≤ x ≤ 1) perovskite for CO₂ reduction with H₂O to CH₄ and CH₃OH

Guo

et al. 2017

RSC Adv.

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“…An increase in Ca 2+ in LFO leads to decrease in PS [11,12] and in grain size [13]. Structural and electrical properties of simultaneously doping LFO with Ca 2+ and Pb 2+ [14] showed that doping with larger Pb 2+ ions up to 20% did not change the principal phase, but lattice parameters, unit cell volume and PS increased. However, another study reported that Pb 2+ doping lead PS to decrease [15].…”

Section: Introductionmentioning

confidence: 98%

Structural and Electrical Properties of Ca2+ Doped LaFeO3: The Effect of A-site Cation Size Mismatch

Irmak

2020

Eng. Technol. Appl. Sci. Res.

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In this study, nanosized La1-xCaxFeO3 (0.00≤x≤0.40) compounds prepared via sol-gel method followed by heat treatment at 1100oC for 24 hours are studied. Crystal structure, microstructure, surface morphology and temperature-dependent resistivity of the samples are investigated. TEM investigation reveals nanoparticles with an average size of 35nm produced from the sol-gel process. The crystal structure of the compounds belongs to an orthorhombically distorted perovskite structure with Pbnm space group. Lattice distortion and cation size mismatch increase with an increase in Ca and particle and grain growth are suppressed by Ca doping. Electrical conduction is explained via thermally activated hopping of small polarons. Unit cell volume, charge ordering temperature, and activation energy for small polarons decrease linearly with an increase in cation size mismatch. Room temperature resistivity decreases with Ca doping and gets its minimum value for 30% Ca at which the orthorhombic distortion is maximum.

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Structural, electrical and ethanol sensing properties of double-doping LaFeO3 perovskite oxides

Cited by 89 publications

References 43 publications

Synthesis and Characterization of Al2O3-Doped LaFeO3 Thick Film Ceramics for Ethanol Gas Sensing Application

Synthesis and Characterization of Al2O3-Doped LaFeO3 Thick Film Ceramics for Ethanol Gas Sensing Application

Photothermal catalytic activity of combustion synthesized LaCo_xFe_1−xO₃ (0 ≤ x ≤ 1) perovskite for CO₂ reduction with H₂O to CH₄ and CH₃OH

Structural and Electrical Properties of Ca2+ Doped LaFeO3: The Effect of A-site Cation Size Mismatch

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Structural, electrical and ethanol sensing properties of double-doping LaFeO3 perovskite oxides

Cited by 89 publications

References 43 publications

Synthesis and Characterization of Al2O3-Doped LaFeO3 Thick Film Ceramics for Ethanol Gas Sensing Application

Synthesis and Characterization of Al2O3-Doped LaFeO3 Thick Film Ceramics for Ethanol Gas Sensing Application

Photothermal catalytic activity of combustion synthesized LaCoxFe1−xO3 (0 ≤ x ≤ 1) perovskite for CO2 reduction with H2O to CH4 and CH3OH

Structural and Electrical Properties of Ca2+ Doped LaFeO3: The Effect of A-site Cation Size Mismatch

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Photothermal catalytic activity of combustion synthesized LaCo_xFe_1−xO₃ (0 ≤ x ≤ 1) perovskite for CO₂ reduction with H₂O to CH₄ and CH₃OH