Room-temperature reduction at SrRuO3–metal interface in hydrogenous atmosphere detected by interface-sensitive resistance measurement

Kambara, Hiroshi; Tanaka, Hiroyuki; Oishi, Satoru; Tenya, Kenichi; Tsujii, H.

doi:10.1063/5.0022041

Cited by 3 publications

(1 citation statement)

References 17 publications

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“…This can lead to poor gas response performance and increased electrical resistance. Therefore, there is a need to explore new methods and strategies to reduce the number of nanoparticle interfaces while maintaining a high specific surface area at lower heat treatment temperatures [16].…”

Section: Introductionmentioning

confidence: 99%

In Situ-Derived N-Doped ZnO from ZIF-8 for Enhanced Ethanol Sensing in ZnO/MEMS Devices

Liang,

Yan,

Yang

et al. 2024

Molecules

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Microelectromechanical systems (MEMS) gas sensors have numerous advantages such as compact size, low power consumption, ease of integration, etc., while encountering challenges in sensitivity and high resistance because of their low sintering temperature. This work utilizes the in situ growth of Zeolitic Imidazolate Framework-8 (ZIF-8) followed by its conversion to N-doped ZnO. The results obtained from scanning electron microscopy (SEM) and transmission electron microscopy (TEM) indicate that the in situ derivation of ZIF-8 facilitates the adhesion of ZnO particles, forming an island-like structure and significantly reducing the interfaces between these particles. Furthermore, powder X-ray diffraction (XRD) analysis, elemental mapping, and X-ray photoelectron spectroscopy (XPS) analysis confirm the conversion of ZIF-8 to ZnO, the successful incorporation of N atoms into the ZnO lattice, and the creation of more oxygen vacancies. The ZIF-8-derived N-doped ZnO/MEMS sensor (ZIF (3)-ZnO/MEMS) exhibits remarkable gas sensitivity for ethanol detection. At an operating temperature of 290 °C, it delivers a substantial response value of 80 towards 25 ppm ethanol, a 13-fold enhancement compared with pristine ZnO/MEMS sensors. The sensor also exhibits an ultra-low theoretical detection limit of 11.5 ppb to ethanol, showcasing its excellent selectivity. The enhanced performance is attributed to the incorporation of N-doped ZnO, which generates abundant oxygen vacancies on the sensor’s surface, leading to enhanced interaction with ethanol molecules. Additionally, a substantial two-order-of-magnitude decrease in the resistance of the gas-sensitive film is observed. Overall, this study provides valuable insights into the design and fabrication strategies applicable to high-performance MEMS gas sensors in a broader range of gas sensing.

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Section: Introductionmentioning

confidence: 99%

In Situ-Derived N-Doped ZnO from ZIF-8 for Enhanced Ethanol Sensing in ZnO/MEMS Devices

Liang,

Yan,

Yang

et al. 2024

Molecules

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Investigation of time variations of redox reactions in SrRuO3 through interface-sensitive resistance measurements

Kambara

Shimazaki

Tenya

2023

Journal of Applied Physics

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We used an interface-sensitive resistance measurement technique to observe the time evolution of the early stages of redox reactions at the interface between the metallic oxide SrRuO[Formula: see text] and a silver epoxy electrode at around room temperature ([Formula: see text]–320 K). On exposure to a reducing gas (CO or H[Formula: see text]), the interface resistance gradually increased. The time variation functions of the resistance increases for CO and H[Formula: see text] were similar, although the magnitude was greater for H[Formula: see text] than for CO. After substitution of O[Formula: see text] for the reducing gas, the interface resistance decreased to almost the initial value, i.e., that before exposure to a reducing gas. The resistance variations can be well explained by the time variations of the oxygen deficiency at the SrRuO[Formula: see text] interface and subsurfaces as a result of reduction or oxidation. We regarded the reactions as pseudo-first-order reactions and evaluated the rate constants of the SrRuO[Formula: see text] redox reactions at a SrRuO[Formula: see text]–Ag interface. For the reduction (resistance increase) process, a single exponential component was enough to fit the data, which suggests that the reduction proceeds successively from outside to inside the bulk. Adsorption of oxygen atoms in the oxidation (resistance decrease) process involved several rate constants, at least up to three exponential components, depending on the prior degradation by a reducing gas. The effective activation energy of each redox reaction was evaluated from an Arrhenius plot.

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Resistivity Measurements in Palladium Hydride Film Prepared by Low-Temperature Hydrogen Absorption Method

Kato,

Yoshida,

Iimori

et al. 2024

J. Phys. Soc. Jpn.

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Room-temperature reduction at SrRuO3–metal interface in hydrogenous atmosphere detected by interface-sensitive resistance measurement

Cited by 3 publications

References 17 publications

In Situ-Derived N-Doped ZnO from ZIF-8 for Enhanced Ethanol Sensing in ZnO/MEMS Devices

In Situ-Derived N-Doped ZnO from ZIF-8 for Enhanced Ethanol Sensing in ZnO/MEMS Devices

Investigation of time variations of redox reactions in SrRuO3 through interface-sensitive resistance measurements

Resistivity Measurements in Palladium Hydride Film Prepared by Low-Temperature Hydrogen Absorption Method

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