The role of substrate temperature on the performance of humidity sensors manufactured from cerium oxide thin films

Gatea, Hamed A.

doi:10.1007/s10854-020-04714-8

Cited by 7 publications

(3 citation statements)

References 37 publications

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“…Therefore, the reports on better sensing performance of nanostructured ceria compared to the bulk material come as no surprise [ 8 , 9 ]. For the preparation of ceria thin-films, a variety of physical deposition methods has been reported [ 9 , 10 ]. Several reports of relatively demanding methods, such as pulsed laser deposition or magnetron sputtering, stand out [ 10 ].…”

Section: Introductionmentioning

confidence: 99%

“…For the preparation of ceria thin-films, a variety of physical deposition methods has been reported [ 9 , 10 ]. Several reports of relatively demanding methods, such as pulsed laser deposition or magnetron sputtering, stand out [ 10 ]. Among demanding chemical depositions, it was shown that chemical vapor deposition can be used [ 11 ].…”

Section: Introductionmentioning

confidence: 99%

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Humidity Sensing Ceria Thin-Films

Mandić¹,

Bafti²,

Pavić

et al. 2022

Nanomaterials

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Lowering the constitutive domains of semiconducting oxides to the nano-range has recently opened up the possibility of added benefit in the research area of sensing materials, in terms both of greater specific surface area and pore volume. Among such nanomaterials, ceria has attracted much attention; therefore, we chemically derived homogeneous ceria nanoparticle slurries. One set of samples was tape-casted onto a conducting glass substrate to form thin-films of various thicknesses, thereby avoiding demanding reaction conditions typical of physical depositions, while the other was pressed into pellets. Structural and microstructural features, along with electrical properties and derivative humidity-sensing performance of ceria thin-films and powders pressed into pellets, were studied in detail. Particular attention was given to solid-state impedance spectroscopy (SS-IS), under controlled relative humidity (RH) from 30%–85%, in a wide temperature and frequency range. Moreover, for the thin-film setup, measurements were performed in surface-mode and cross-section-mode. From the results, we extrapolated the influence of composition on relative humidity, the role of configuration and thin-film thickness on electrical properties, and derivative humidity-sensing performance. The structural analysis and depth profiling both point to monophasic crystalline ceria. Microstructure analysis reveals slightly agglomerated spherical particles and thin-films with low surface roughness. Under controlled humidity, the shape of the conductivity spectrum stays the same along with an increase in RH, and a notable shift to higher conductivity values. The relaxation is slow, as the thickness of the pellet slows the return of conductivity values. The increase in humidity has a positive effect on the overall DC conductivity, similar to the temperature effect for semiconducting behavior. As for the surface measurement setup, the thin-film thickness impacts the shape of the spectra and electrical processes. The surface measurement setup turns out to be more sensitive to relative humidity changes, emphasized with higher RH, along with an increase in thin-film thickness. The moisture directly affects the conductivity spectra in the dispersion part, i.e., on the localized short-range charge carriers. Moisture sensitivity is a reversible process for thin-film samples, in contrast to pellet form samples.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Humidity Sensing Ceria Thin-Films

Mandić¹,

Bafti²,

Pavić

et al. 2022

Nanomaterials

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“…23 However, the ferroelectric structure has different characteristics at the nano-scale compared to its bulk materials, such as the curie temperature(T c ), mean polarisation, area of the coercive electric field, hysteresis loop, remnant polarisation, and piezoelectric strain, all of which rely on the crystal structure size. 25,26 The most common ferroelectric oxide within the perovskite ABO3 structure is barium strontium titanate (Ba 1-x Sr x TiO 3 ). Ferroelectric materials, such as BaTiO 3 and PbTiO 3 , are generally known to exhibit the size effect, with ferroelectric properties that change depending on the materials' size to exhibit various behaviors.…”

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Impact of High Heat Treatment on Ferroelectric Materials Properties: Ba_1−xSr_xTiO₃ as a Model

Gatea,

Abbas,

Shaghnab

2023

ECS J. Solid State Sci. Technol.

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Ferroelectric materials differ from other dielectrics because their polarization stays after removing the external field. Hysteresis loops describe a wide range of behavior in engineering, chemistry, and physics disciplines. Sol-gel has prepared barium strontium titanate (Ba0.7Sr0.3TiO3; BST) nanocrystalline ceramics. Ba1-xSrxTiO3 crystal size increased as the sintering temperatures elevated from 900 °C to 1200 °C. The XRD patterns of Ba0.7Sr0.3TiO3 exhibited a tetragonal phase. (FESEM) used to measure the average particle size. The relationships between crystal size, dielectric and ferroelectric properties were investigated, showing better dielectric and piezoelectric parameters with increasing crystal and particle size. The increasing particle size also slightly shifted the curie transition temperature towards higher temperatures. The coercive field of Ba0.7Sr0.3TiO3 goes down as the crystal size increases, but the remnant and spontaneous polarization get better. This material is advantageous for applications in tunable capacitor devices.

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Facile fabrication method and decent humidity sensing of anodised nanotubular Ta2O5 on Ta foil substrate

Ngadiman

Rani

Ayub

et al. 2022

J Mater Sci: Mater Electron

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The role of substrate temperature on the performance of humidity sensors manufactured from cerium oxide thin films

Cited by 7 publications

References 37 publications

Humidity Sensing Ceria Thin-Films

Humidity Sensing Ceria Thin-Films

Impact of High Heat Treatment on Ferroelectric Materials Properties: Ba_1−xSr_xTiO₃ as a Model

Facile fabrication method and decent humidity sensing of anodised nanotubular Ta2O5 on Ta foil substrate

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The role of substrate temperature on the performance of humidity sensors manufactured from cerium oxide thin films

Cited by 7 publications

References 37 publications

Humidity Sensing Ceria Thin-Films

Humidity Sensing Ceria Thin-Films

Impact of High Heat Treatment on Ferroelectric Materials Properties: Ba1−xSrxTiO3 as a Model

Facile fabrication method and decent humidity sensing of anodised nanotubular Ta2O5 on Ta foil substrate

Contact Info

Product

Resources

About

Impact of High Heat Treatment on Ferroelectric Materials Properties: Ba_1−xSr_xTiO₃ as a Model