Morphology, Structural and Dielectric Properties of Vacuum Evaporated V2O5 Thin Films

Sengodan, R.; Shekar, B. Chandar; Sathish, S.

doi:10.1016/j.phpro.2013.10.022

Cited by 11 publications

(7 citation statements)

References 12 publications

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“…The observed optical and dielectric properties of the hybrid PVA-InZnO thin lm are in good agreement with earlier reported work on other oxide materials. 31,[101][102][103] The obtained optical and dielectric properties of the dip coated hybrid PVA-InZnO thin lms are good enough to be used in optical devices and as high dielectric layer in organic thin lm transistors.…”

Section: Uv-visible-nir Spectroscopymentioning

confidence: 91%

Novel hybrid PVA–InZnO transparent thin films and sandwich capacitor structure by dip coating method: preparation and characterizations

Sathish¹,

Bellan

Manandhar

et al. 2015

RSC Adv.

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Section: Uv-visible-nir Spectroscopymentioning

confidence: 91%

Novel hybrid PVA–InZnO transparent thin films and sandwich capacitor structure by dip coating method: preparation and characterizations

Sathish¹,

Bellan

Manandhar

et al. 2015

RSC Adv.

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“…Therefore, the nonlinearity of current-voltage characteristics became considerably lower and it became impossible to reach electric field E 1 (at 1 mA cm −2 ) under our experiment conditions. Besides, the sample with V 2 O 5 addition exhibits lower ε = 14 due to the influence of the vanadium oxide phase with low relative dielectric permittivity [27,28].…”

Section: Addition Nonlinearity Electric Field Dielectric Electrical Conductivitymentioning

confidence: 99%

Electrical properties of SnO₂-based varistor ceramics with solid-phase and liquid-phase sintering

Gaponov¹,

Skuratovsky²

2019

J. Phys. Stud.

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The varistor effect takes place in SnO2-Co3O4-Nb2O5-Cr2O3 ceramics with CaO, SrO or BaO additions prepared by solid-phase sintering and in the same ceramics with CuO, V2O5 or Bi2O3 additions prepared by liquid-phase sintering. This effect is accompanied by a humidity-sensitive effect at the low-field electrical conductivity. The latter is observed when air relative humidity increases from 10 to 93%. The lowest humidity-sensitive effect was found in the liquid-phase sintering samples. For the investigated samples the values of the nonlinearity coefficient 24-50 at high electric fields (E1 = 2.8 − 11 kV cm −1 ) and the humidity sensitivity coefficient 1.8•10 3 -3.2•10 5 at low electric fields were calculated. Such properties of tin oxide based ceramics can be explained within the model of electrical conduction controlled by the grain-boundary potential barriers and the dissociative adsorption of water molecules on the samples surface. This leads to a low decrease of the intergranular potential barrier height in the humid air and an increase in the conductivity in low electric fields. At the same time in the high electric fields the barrier height decreases more intensively with an increase in the electric field and this leads to the varistor effect.

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“…Therefore the nonlinearity of currentvoltage characteristics became considerable less and it became impossible to reach the breakdown electric field E 1 (at j = 1 mA·cm -2 ) in our experiment. Besides, the sample with V 2 O 5 addition exhibits lower value ε ≈ 14 (Table 1) due to the influence of vanadium oxide phase with not high relative dielectric permittivity [21,22].…”

Section: Electrical Characteristicsmentioning

confidence: 99%

HUMIDITY SENSORS BASED ON SnO2 -Co3 O4 -Nb2 O5 -Cr2 O3 SEMICONDUCTOR VARISTOR CERAMICS

Гапонов¹

2018

SEMST

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The varistor effect in SnO 2 -Co 3 O 4 -Nb 2 O 5 -Cr 2 O 3 ceramics with different additions is accompanied by a strong humidity-sensitivity effect in the low-field electrical conductivity. The low-field electrical conductivity and dielectric permittivity of ceramics are increased when air relative humidity rises from 10 to 93%. Such effects are observed both in the samples prepared by solid-phase sintering without or with CaO addition and in the samples prepared by liquid-phase sintering with CuO or V 2 O 5 additions. The lowest humidity-sensitivity effect was found in the liquid-phase sintering samples due to the more solid structures and the secondary phases which are located between the SnO 2 grains. For the studied samples the values of humidity sensitivity coefficient 1.8·10 3 -3.2·10 5 at low electric fields and the nonlinearity coefficient 30-57 at high electric fields (E 1 = 5.3-7 kV·cm -1 ) were calculated. The properties of oxide ceramics are explained by electrical conductivity which is controlled by the grain-boundary potential barriers. The barrier height decreases with the increase both of air relative humidity at low electric fields and of voltage at high electric fields. Strong humidity sensitivity is a key factor for sensor application of SnO 2based ceramics. кераміці з різними домішками супроводжувався сильним вологочутливим ефектом для електричної провідності у слабкому полі. Електропровідність у слабких полях і діелектрична проникність кераміки збільшувались при зростанні відносної вологості повітря з 10 до 93%. Такі ефекти спостерігались як для твердо-фазних синтезованих зразків без або з CaO домішкою, так і для рідко-фазних синтезованих зразків з CuO або V 2 O 5 домішками. Найменшу вологочутливість мають рідкофазні синтезовані зразки у зв'язку з їх більш щільною структурою й існуючими вторинними фазами, які розташовуються між зернами SnO 2 . Для досліджених зразків обчислені значення коефіцієнта вологочутливості 1,8·10 3 -3,2·10 5 при слабких електричних полях і коефіцієнта нелінійності 30-57 при сильних електричних полях (E 1 = 5,3-7 кВ·см -1 ). Властивості оксидної кераміки пояснюються електричною провідністю, яка контролюється потенціальними бар'єрами на межах зерен. Висота бар'єрів зменшується як зі збільшенням відносної вологості повітря при слабких електричних полях, так і напруги при сильних електричних полях. Велика вологочутливість є ключовим фактором для сенсорного використання кераміки на основі SnO 2 .Ключові слова: сенсор вологості, оксид олова, варистор, оксидна кераміка, межа зерен, електрична провідність СЕНСОРЫ ВЛАЖНОСТИ НА ОСНОВЕ ПОЛУПРОВОДНИКОВОЙ ВАРИСТОРНОЙ КЕРАМИКИ SnO 2 -Co 3 O 4 -Nb 2 O 5 -Cr 2 O 3 А. В. ГапоновАннотация. Варисторный эффект в SnO 2 -Co 3 O 4 -Nb 2 O 5 -Cr 2 O 3 керамике с различными добавками сопровождался сильным влагочувствительным эффектом для электрической проводимости в слабом поле. Электропроводность в слабых полях и диэлектрическая проницаемость керамики увеличивались при повышении относительной влажности воздуха с 10 до 93%. Такие эффекты набл...

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Morphology, Structural and Dielectric Properties of Vacuum Evaporated V2O5 Thin Films

Cited by 11 publications

References 12 publications

Novel hybrid PVA–InZnO transparent thin films and sandwich capacitor structure by dip coating method: preparation and characterizations

Novel hybrid PVA–InZnO transparent thin films and sandwich capacitor structure by dip coating method: preparation and characterizations

Electrical properties of SnO₂-based varistor ceramics with solid-phase and liquid-phase sintering

HUMIDITY SENSORS BASED ON SnO2 -Co3 O4 -Nb2 O5 -Cr2 O3 SEMICONDUCTOR VARISTOR CERAMICS

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Morphology, Structural and Dielectric Properties of Vacuum Evaporated V2O5 Thin Films

Cited by 11 publications

References 12 publications

Novel hybrid PVA–InZnO transparent thin films and sandwich capacitor structure by dip coating method: preparation and characterizations

Novel hybrid PVA–InZnO transparent thin films and sandwich capacitor structure by dip coating method: preparation and characterizations

Electrical properties of SnO2-based varistor ceramics with solid-phase and liquid-phase sintering

HUMIDITY SENSORS BASED ON SnO2 -Co3 O4 -Nb2 O5 -Cr2 O3 SEMICONDUCTOR VARISTOR CERAMICS

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Electrical properties of SnO₂-based varistor ceramics with solid-phase and liquid-phase sintering