Oxygen-vacancy-related giant permittivity and ethanol sensing response in SrTiO3- ceramics

Trabelsi, H.; Bejar, M.; Dhahri, E.; Valente, M.A.; Graça, M.P.F.

doi:10.1016/j.physe.2018.12.025

Cited by 27 publications

(15 citation statements)

References 33 publications

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“…The sintering temperature at 1200 °C is then considered high. This shows thatoxygen deficiencies that are near to the grain boundaries can be created in this sample [ 72 , 73 , 74 ]. Various studies have shown that oxygen defects contribute to the dielectric response.…”

Section: Resultsmentioning

confidence: 99%

“…This is manifested in the reorientation of elementary electric dipoles [ 72 , 73 ]. The ionization of oxygen defects creates conduction electrons that could be trapped by Mn 4+ cations, which leads to the formation of Mn 3+ cations [ 74 ]. Then, defect dipoles are produced [ 74 ].…”

Section: Resultsmentioning

confidence: 99%

“…The ionization of oxygen defects creates conduction electrons that could be trapped by Mn 4+ cations, which leads to the formation of Mn 3+ cations [ 74 ]. Then, defect dipoles are produced [ 74 ]. This causes the increase in the dielectric-constant values.…”

Section: Resultsmentioning

confidence: 99%

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Effect of Sintering Temperature and Polarization on the Dielectric and Electrical Properties of La0.9Sr0.1MnO3 Manganite in Alternating Current

et al. 2022

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The electrical characterization ofa La0.9Sr0.1MnO3 compound sintered at 800, 1000 and 1200 °C was investigated by means of the impedance-spectroscopy technique. As the results, the experimental conductivity spectra were explained in terms of the power law. The AC-conductivity study reveals the contributions of different conduction mechanisms. Indeed, the variation in the frequency exponents (‘s1’ and ‘s2’) as a function of the temperature confirms the thermal activation of the conduction process in the system. It proves, equally, that the transport properties are governed by the non-small-polaron-tunneling and the correlated-barrier-hopping mechanisms. Moreover, the values of the frequency exponents increase under the sintering-temperature (TS) effect. Such an evolution may be explained energetically. The jump relaxation model was used to explain the electrical conductivity in the dispersive region, as well as the frequency-exponent values by ionic conductivity. Under electrical polarization with applied DC biases of Vp = 0.1 and 2 V at room temperature, the results show the significant enhancement of the electrical conductivity. In addition, the dielectric study reveals the evident presence of dielectric relaxation. Under the sintering-temperature effect, the dielectric constant increases enormously. Indeed, the temperature dependence of the dielectric constant is well fitted by the modified Curie–Weiss law. Thus, the deduced values of the parameter (γ) confirm the relaxor character and prove the diffuse phase transition of our material. Of note is the high dielectric-permittivity magnitude, which indicates that the material is promising for microelectronic devices.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Effect of Sintering Temperature and Polarization on the Dielectric and Electrical Properties of La0.9Sr0.1MnO3 Manganite in Alternating Current

et al. 2022

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“…ST-based gas sensors have also been tested under exposure to volatile organic compounds (VOC), such as ethanol. Recently, Trabelsi et al [82] presented the ethanol-sensing response of a SrTiO 3−g -based gas sensor fabricated by a solid-state reaction enhanced in a thermally activated process. The electrical properties of the sensors were examined using impedance spectroscopy in a wide range of potential operating temperatures from −33 to 40 • C. The obtained SrTiO 3-δ was characterized by low resistivity and low dielectric losses.…”

Section: Srtio 3 For Gas-sensing Applicationsmentioning

confidence: 99%

“…The sensors exhibited a decrease in conductivity after introducing ethanol gas (p-type semiconductor effect). Interesting is the fact that the optimal working temperatures for the tested samples are lower, about 350-370 • C, which suggests the dominant role of oxygen vacancies in detecting the presence of ethanol [82].…”

Section: Srtio 3 For Gas-sensing Applicationsmentioning

confidence: 99%

Semiconducting Metal Oxides: SrTiO3, BaTiO3 and BaSrTiO3 in Gas-Sensing Applications: A Review

et al. 2021

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In this work, a broad overview in the field of strontium titanate (ST, SrTiO3)-, barium titanate (BT, BaTiO3)- and barium strontium titanate (BST, BaSrTiO3)-based gas sensors is presented and discussed. The above-mentioned materials are characterized by a perovskite structure with long-term stability and therefore are very promising materials for commercial gas-sensing applications. Within the last 20 years, the number of papers where ST, BT and BST materials were tested as gas-sensitive materials has ten times increased and therefore an actual review about them in this field has been expected by readers, who are researchers involved in gas-sensing applications and novel materials investigations, as well as industry research and development center members, who are constantly searching for gas-sensing materials exhibiting high 3S parameters (sensitivity, selectivity and stability) that can be adapted for commercial realizations. Finally, the NO2-sensing characteristics of the BST-based gas sensors deposited by the authors with the utilization of magnetron sputtering technology are presented.

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Study of room temperature NO2 sensing performances of ZnO1-x (x = 0, 0.05, 0.10)

et al. 2021

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Oxygen-vacancy-related giant permittivity and ethanol sensing response in SrTiO3- ceramics

Cited by 27 publications

References 33 publications

Effect of Sintering Temperature and Polarization on the Dielectric and Electrical Properties of La0.9Sr0.1MnO3 Manganite in Alternating Current

Effect of Sintering Temperature and Polarization on the Dielectric and Electrical Properties of La0.9Sr0.1MnO3 Manganite in Alternating Current

Semiconducting Metal Oxides: SrTiO3, BaTiO3 and BaSrTiO3 in Gas-Sensing Applications: A Review

Study of room temperature NO2 sensing performances of ZnO1-x (x = 0, 0.05, 0.10)

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