Thin films of palladium oxide for gas sensors

Ryabtsev, S. V.; Shaposhnik, A. V.; Samoylov, A. M.; Sinelnikov, A. A.; Soldatenko, S. A.; Kuschev, S. B.; Иевлев, В. М.

doi:10.1134/s0012501616100055

Cited by 18 publications

(10 citation statements)

References 8 publications

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“…The band gap energy of the Pd-γ-Al 2 O 3 and PdO-γ-Al 2 O 3 photocatalysts was obtained from the PL spectra and is between 2.5 and 2.7 eV, which is almost the same as that previously reported. 59 Fig. 11 shows the mechanism of photocatalytic degradation of the employed organic dyes using Pd-γ-Al 2 O 3 and PdO-γ-Al 2 O 3 NPs as photocatalysts.…”

Section: Resultsmentioning

confidence: 99%

“…The band gap energy of the Pd-g-Al 2 O 3 and PdO-g-Al 2 O 3 photocatalysts was obtained from the PL spectra and is between 2.5 and 2.7 eV, which is almost the same as that previously reported. 59 on the surface of Pd/PdO NPs absorbs photons with energy equal to or greater than the band difference between the photocatalyst's valence and conduction bands. The photon absorption allows the valence electrons (e À ) to excite the path from the valence to the conduction band, resulting in positive holes (h + ) in the valence band.…”

Section: Mechanism For Photocatalytic Degradationmentioning

confidence: 99%

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Photocatalytic degradation of organic dyes: Pd-γ-Al₂O₃ and PdO-γ-Al₂O₃ as potential photocatalysts

et al. 2021

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Section: Resultsmentioning

confidence: 99%

Section: Mechanism For Photocatalytic Degradationmentioning

confidence: 99%

Photocatalytic degradation of organic dyes: Pd-γ-Al₂O₃ and PdO-γ-Al₂O₃ as potential photocatalysts

et al. 2021

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“…The assumption to use palladium (II) oxide, which is a p-type semiconductor with the energy band gap ΔE g = 2.2-2.7 eV [36][37][38], as the material for the detection of toxic and highly inflammable gas in ambient air has not been accidental for some reasons [39,40]. Firstly, for a long time, palladium and its compounds in (+2) oxidation state were exploited as very effective catalysts for oxidation reactions of hydrocarbons, including automobile catalytic converters and the catalytic combustion of methane in advanced gas turbines.…”

Section: Novel Nanomaterials -Synthesis and Applicationsmentioning

confidence: 99%

Palladium (II) Oxide Nanostructures as Promising Materials for Gas Sensors

Samoylov¹,

Ryabtsev²,

Popov³

et al. 2018

Novel Nanomaterials - Synthesis and Applications

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One of the most important environment monitoring problems is the detection of oxidizing gases in the ambient air. Negative impact of noxious oxidizing gases (ozone and nitrogen oxides) on human health, sensitive vegetation, and ecosystems is very serious. For this reason, palladium (II) oxide nanostructures have been employed for oxidizing gas detection. Thin and ultrathin films of palladium (II) oxide were prepared by thermal oxidation at dry oxygen of previously formed pure palladium layers on polished poly-Al 2 O 3 , SiO 2 /Si (100), optical quality quartz, and amorphous carbon/KCl substrates. At ozone and nitrogen dioxide detection, PdO films prepared by oxidation at T = 870 K have demonstrated good values of sensitivity, signal stability, operation speed, and reproducibility of sensor response. In comparison with other materials, palladium (II) oxide thin and ultrathin films have some advantages at gas sensor fabrication. Firstly, for oxidizing gas detection, PdO films with p-type conductivity are more perspective than the material with n-type conductivity. Secondly, at ambient conditions, palladium (II) oxide is insoluble in water and does not react with it. These facts are favorable for the fabrication of gas detectors because they make possible to minimize the air humidity influence on PdO sensor response values. Thirdly, the synthesis procedure of PdO films is rather simple and is compatible with planar processes of microelectronic industry.

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“…Чаще всего для детектирования озона используют оксиды WO 3 , In 2 O 3 , SnO 2 , ZnO, как индивидуальные, так и с различными добавками. В настоящей работе был применен новый сенсорный оксидный материал PdO, впервые предложенный для анализа озона в наших предыдущих работах [2][3][4][5].…”

Section: Introductionunclassified

Структурные и газочувствительные характеристики тонких полупроводниковых пленок PdO различной толщины при детектировании озона

Рябцев¹,

Гхариб²,

Турищев³

et al. 2021

Физика И Техника Полупроводников

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PdO films were obtained by thermal deposition of palladium metal with a thickness of 30 and 90 nm, followed by its oxidation in air at different temperatures. PdO oxide films are characterized by transmission electron microscopy (TEM) and reflection high-energy electron diffraction (RHEED). Data on the semiconductor properties and gas sensitivity to different concentrations of ozone in the air are obtained. The optimal temperature conditions for the oxidation of the films are established, which ensure their uniform phase composition and the absence of electrical noise during the detection of gases. The mechanism of the electrical noise appearance in ultrathin films associated with their fragmentation during oxidative annealing is proposed and justified. The possibility of detecting ozone impurities in the air below the maximum permissible concentration (MPC) by PdO semiconductor films is shown.

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Thin films of palladium oxide for gas sensors

Cited by 18 publications

References 8 publications

Photocatalytic degradation of organic dyes: Pd-γ-Al₂O₃ and PdO-γ-Al₂O₃ as potential photocatalysts

Photocatalytic degradation of organic dyes: Pd-γ-Al₂O₃ and PdO-γ-Al₂O₃ as potential photocatalysts

Palladium (II) Oxide Nanostructures as Promising Materials for Gas Sensors

Структурные и газочувствительные характеристики тонких полупроводниковых пленок PdO различной толщины при детектировании озона

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Thin films of palladium oxide for gas sensors

Cited by 18 publications

References 8 publications

Photocatalytic degradation of organic dyes: Pd-γ-Al2O3 and PdO-γ-Al2O3 as potential photocatalysts

Photocatalytic degradation of organic dyes: Pd-γ-Al2O3 and PdO-γ-Al2O3 as potential photocatalysts

Palladium (II) Oxide Nanostructures as Promising Materials for Gas Sensors

Структурные и газочувствительные характеристики тонких полупроводниковых пленок PdO различной толщины при детектировании озона

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Photocatalytic degradation of organic dyes: Pd-γ-Al₂O₃ and PdO-γ-Al₂O₃ as potential photocatalysts

Photocatalytic degradation of organic dyes: Pd-γ-Al₂O₃ and PdO-γ-Al₂O₃ as potential photocatalysts