Planar platform for temperature dependent four-wire impedance spectroscopy—A novel tool to characterize functional materials

Hagen, Gunter; Kita, Jarosław; Izu, Noriya; Röder-Roith, Ulla; Schönauer-Kamin, Daniela; Moos, Ralf

doi:10.1016/j.snb.2012.10.068

Cited by 5 publications

(3 citation statements)

References 31 publications

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“…The IS4 data were taken in a frequency range of 1-10 7 Hz with a rms AC voltage amplitude of 20 mV and the IS2-in the range of 10-10 6 Hz and a rms AC voltage of 50 mV. From the differences in both spectra, one may identify electrode effects [33] and exclude them from further interpretation of true electrical conductivity of CZO.…”

Section: Methodsmentioning

confidence: 99%

“…Obviously, the low-frequency semicircle observed in IS2 is eliminated by the IS4 approach. Hence, the charge transfer in this frequency domain contribution can be attributed to the polarization effects at the interface between the CZO and Pt-electrodes [33,39,41,[44][45][46][47]. Since the polarization effect is related to a specific measurement approach, it will not be further evaluated and [29].…”

Section: Temperature Dependence Of Electrical Conductivity Of Czomentioning

confidence: 99%

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Comparison of the electrical conductivity of bulk and film Ce1–xZrxO2–δ in oxygen-depleted atmospheres at high temperatures

et al. 2021

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Featuring high levels of achievable oxygen non-stoichiometry δ, Ce1−xZrxO2−δ solid solutions (CZO) are crucial for application as oxygen storage materials in, for example, automotive three-way catalytic converters (TWC). The use of CZO in form of films combined with simple manufacturing methods is beneficial in view of device miniaturization and reducing of TWC manufacturing costs. In this study, a comparative microstructural and electrochemical characterization of film and conventional bulk CZO is performed using X-ray diffractometry, scanning electron microscopy, and impedance spectroscopy. The films were composed of grains with dimensions of 100 nm or less, and the bulk samples had about 1 µm large grains. The electrical behavior of nanostructured films and coarse-grained bulk CZO (x > 0) was qualitatively similar at high temperatures and under reducing atmospheres. This is explained by dominating effect of Zr addition, which masks microstructural effects on electrical conductivity, enhances the reducibility, and favors strongly electronic conductivity of CZO at temperatures even 200 K lower than those for pure ceria. The nanostructured CeO2 films had much higher electrical conductivity with different trends in dependence on temperature and reducing atmospheres than their bulk counterparts. For the latter, the conductivity was dominantly electronic, and microstructural effects were significant at T < 700 °C. Nanostructural peculiarities of CeO2 films are assumed to induce their more pronounced ionic conduction at medium oxygen partial pressures and relatively low temperatures. The defect interactions in bulk and film CZO under reducing conditions are discussed in the framework of conventional defect models for ceria.

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Section: Methodsmentioning

confidence: 99%

Section: Temperature Dependence Of Electrical Conductivity Of Czomentioning

confidence: 99%

Comparison of the electrical conductivity of bulk and film Ce1–xZrxO2–δ in oxygen-depleted atmospheres at high temperatures

et al. 2021

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“…For radio-frequency sensor applications, microstrip structures are particularly suitable due to their planar structure. This ensures a simple and automatable production of the sensor devices and the sensitive materials can be easily applied, for example by screen printing or aerosol deposition (Hanft et al, 2018;Ménil et al, 2005).…”

Section: Microstrip Structurementioning

confidence: 99%

Novel radio-frequency-based gas sensor with integrated heater

Walter¹,

Bogner²,

Hagen³

et al. 2019

J. Sens. Sens. Syst.

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Abstract. Up to now, sensor applications have rarely used materials whose dielectric properties are a function of the gas concentration. A sensor principle, by which this material effect can be utilized, is based planar radio-frequency sensors. For the first time, such a sensor was equipped with an integrated heater and successfully operated at temperatures up to 700 ∘C. This makes it possible to apply materials that show gas-dependent changes in the dielectric properties only at higher temperatures. By coating the planar resonance structure with a zeolite, ammonia could be detected. The amount of ammonia stored in the sensitive layer can thereby be determined, since the resonant frequency of the sensor shifts with its ammonia loading. Desorption measurements showed a dependence of the storage behavior of the ammonia in the gas-sensitive layer on the operating temperature of the sensor. Thus, it was possible that by operating the sensor at 300 ∘C, it only shows a gas-concentration-dependent signal. At lower operating temperatures, on the other hand, the sensor could possibly be used for dosimetric determination of very low ammonia concentrations.

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In- and through-plane conductivity of 8YSZ films produced at room temperature by aerosol deposition

2019

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Planar platform for temperature dependent four-wire impedance spectroscopy—A novel tool to characterize functional materials

Cited by 5 publications

References 31 publications

Comparison of the electrical conductivity of bulk and film Ce1–xZrxO2–δ in oxygen-depleted atmospheres at high temperatures

Comparison of the electrical conductivity of bulk and film Ce1–xZrxO2–δ in oxygen-depleted atmospheres at high temperatures

Novel radio-frequency-based gas sensor with integrated heater

In- and through-plane conductivity of 8YSZ films produced at room temperature by aerosol deposition

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