RF Sputtered CeO<sub>2</sub>Thin Films-Based Oxygen Sensors

Ramshanker, N.; Ganapathi, K.; Bhat, M. S.; Mohan, S.

doi:10.1109/jsen.2019.2931766

Cited by 26 publications

(6 citation statements)

References 40 publications

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“…Its (111) diffraction peak is the strongest. This is because the energy of the (111) crystal plane in CeO 2 cubic fluorite structure is low, 22 and the Ce 1‐ x Co x O 2 films by RF sputtering preferentially grow along the (111) plane. Weak (200), (220), (311), (222), (400), and (331) diffraction peaks were also observed, indicating that the RF sputtering Ce 1‐ x Co x O 2 films are polycrystalline structure.…”

Section: Resultsmentioning

confidence: 99%

Structural, optical, and magnetic properties of Co‐doped CeO₂ thin films prepared by radio‐frequency magnetron sputtering

Yang

Zhang

2023

Surface & Interface Analysis

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Co-doped CeO 2 (Ce 1-x Co x O 2 , x = 0, 0.03, and 0.06) thin films were prepared by radio-frequency magnetron sputtering. The structural, optical, and magnetic properties of these films were characterized by X-ray diffraction (XRD), Raman spectroscopy (Raman), atomic force microscopy (AFM), Fourier transform-infrared spectroscopy (FT-IR), spectroscopic ellipsometry (SE), and superconducting quantum interference magnetometer (SQUID). XRD and Raman studies revealed that all the films exhibited single phase of cubic fluorite structure, with highly ( 111) preferred orientation. No Co and Co-related oxide was detected. Compared with undoped CeO 2 films, the defect concentration of Co-doped films increases. AFM images displayed that the film surface morphology is dependent on the Co-doped content. The vibrational band assignment of undoped and Co-doped CeO 2 films was analyzed by FT-IR. The energy dispersion optical constants (the refractive index n and the extinction coefficient k) of Ce 1-x Co x O 2 thin films were obtained by analyzing the SE spectra in the ultraviolet and visible-near infrared (UV-NIR) region (0.5-5.9 eV). The optical band gap energies E g for these films were determined. The E g values of the Ce 1-x-Co x O 2 thin films are 3.35, 3.27, and 3.25 eV, and the n values at wavelength of 632 nm are about 2.35, 2.38, and 2.42 for Co-doped content x = 0, 0.03, and 0.06, respectively. SQUID measurements show that Co-doped CeO 2 films exhibit room temperature ferromagnetism, and the saturation magnetization (M s ) is 0.0051 and 0.0098 emμ/cm 3 with the Co doping content x = 0.03 and 0.06, respectively. The ferromagnetism of Co-doped CeO 2 films belong to the intrinsic magnetism of the films.

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Section: Resultsmentioning

confidence: 99%

Structural, optical, and magnetic properties of Co‐doped CeO₂ thin films prepared by radio‐frequency magnetron sputtering

Yang

Zhang

2023

Surface & Interface Analysis

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“…Taken these results together, the performance of the organohydrogel-based O 2 sensors, including the sensitivity, LOD, stretchability, transparency, linearity, detection range, and operation temperature range, showing huge advantages compared with solid-state oxygen sensors based on other sensing materials (Table 1). [55][56][57][58][59][60][61][62][63] For instance, the response of Xylitol-O O 2 sensor (72.2% to 200 ppm) is higher than that of CeO 2 , TiO 2 , and 2D Bi 2 O 2 Se for similar O 2 concentrations. 56,57,61 The broad detection range is also advantageous for practical applications.…”

Section: Gas Sensing Performancementioning

confidence: 99%

“…[55][56][57][58][59][60][61][62][63] For instance, the response of Xylitol-O O 2 sensor (72.2% to 200 ppm) is higher than that of CeO 2 , TiO 2 , and 2D Bi 2 O 2 Se for similar O 2 concentrations. 56,57,61 The broad detection range is also advantageous for practical applications. Although 100 ppm was the lowest concentration offered in the experimental settings, the organohydrogel sensors should be capable of sensing under lower concentration according to the low theoretical detection limit (0.585 ppm).…”

Section: Gas Sensing Performancementioning

confidence: 99%

Deformable, transparent, high‐performance, room‐temperature oxygen sensors based on ion‐conductive, environment‐tolerant, and green organohydrogels

Lin

et al. 2022

EcoMat

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We present green organohydrogel-based stretchable (up to 700% strain), transparent, and room-temperature O 2 sensors with impressive performance, including drying and freezing tolerances, high sensitivity, broad detection range (100 ppm-100%), long-term stability, low theoretical detection limit (0.585 ppm), linearity, and the capability to real-time monitor human respiration by directly attaching on human skin. A facile solvent replacement approach is employed to partially exchange water with natural and edible xylitol/sorbitol molecules, generating stable, green and tough organohydrogels. Compared with the pristine hydrogel counterpart, the organohydrogel-based O 2 sensors feature higher stability, prolonged life time (140 days) and the ability to work over a wide range of temperatures (À38 to 65 C). The O 2 sensing mechanism is elucidated by investigating the redox reactions occurred at the electrode-hydrogel interface. This work develops a facile strategy to fabricate stretchable, transparent, and high-performance O 2 sensor using stable and green organohydrogels as novel transducing materials for practical wearable applications. K E Y W O R D Santi-freezing and anti-drying hydrogel, conductive and green organohydrogel, redox reaction sensing mechanism, stretchable and room-temperature oxygen sensor, xylitol and sorbitol Yuanqing Lin and Zixuan Wu contributed equally to this work.

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“…Depending on the presence of valance electrons the electronic structure of cerium vary as a result the cerium present in mixed valance state. This property makes this material an important place in industry for various applications as heterogeneous catalyst for oxidizing hazard gasses [1], water gas splitting [2], in memristors for application in meromorphic computing [3] also as a photodiode [4]. Minimization of redox reaction temperature of cerium oxide to make it useful as heterogeneous catalyst is one of the most challenging work now a days.…”

Section: Introductionmentioning

confidence: 99%

Effect of Silver Nanoclusters on Physical and Electrical Properties of Cerium Oxide Thin Film

Paul,

Karmakar,

Chakraborty

2024

Cerium - Chemistry, Technology, Geology, Soil Science and Economics

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An in situ X-ray photoelectron spectroscopy (XPS) investigation has revealed that silver metal clusters (Ag-NCs) can enhance the redox property of cerium oxide (CeO2) at relatively lower temperatures by oxidizing Ag-NCs to Ag2+ and Ag3+ states. Strong metal support interaction (SMSI) effect at the interface is indicated by a specific interaction seen in high-resolution transmission electron microscopy (HRTEM) images of CeO2/Ag-NCs, confirming Ag-NC encapsulation by deposited CeO2 layer after heating. Through chemisorption processes, the SMSI effect aids in the release of oxygen from the ceria surface by making a bond of Ag, O, and Ce. Consequently, employing silver as a supporting novel metal improves the redox behaviour of CeO2 at nearly 100°C. The band gap of cerium is modified because of this interaction as shown by UV-vis spectroscopy, influencing the electronic charge transport property of ceria. The current-voltage (I-V) characteristics in silver cluster supported ceria thin film verify the significant increase in current under visible light illumination as compared to the current in dark conditions. This renders that Ag-NCs supported CeO2 is suitable for photocatalysis and the capacitance-voltage (C-V) characteristic confirms the enhanced storage capacity of Ag-NCs /CeO2-based metal-oxide-semiconductor (MOS) devices qualifies it for use as non-volatile memory (NVM) devices.

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RF Sputtered CeO₂Thin Films-Based Oxygen Sensors

Cited by 26 publications

References 40 publications

Structural, optical, and magnetic properties of Co‐doped CeO₂ thin films prepared by radio‐frequency magnetron sputtering

Structural, optical, and magnetic properties of Co‐doped CeO₂ thin films prepared by radio‐frequency magnetron sputtering

Deformable, transparent, high‐performance, room‐temperature oxygen sensors based on ion‐conductive, environment‐tolerant, and green organohydrogels

Effect of Silver Nanoclusters on Physical and Electrical Properties of Cerium Oxide Thin Film

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RF Sputtered CeO2Thin Films-Based Oxygen Sensors

Cited by 26 publications

References 40 publications

Structural, optical, and magnetic properties of Co‐doped CeO2 thin films prepared by radio‐frequency magnetron sputtering

Structural, optical, and magnetic properties of Co‐doped CeO2 thin films prepared by radio‐frequency magnetron sputtering

Deformable, transparent, high‐performance, room‐temperature oxygen sensors based on ion‐conductive, environment‐tolerant, and green organohydrogels

Effect of Silver Nanoclusters on Physical and Electrical Properties of Cerium Oxide Thin Film

Contact Info

Product

Resources

About

RF Sputtered CeO₂Thin Films-Based Oxygen Sensors

Structural, optical, and magnetic properties of Co‐doped CeO₂ thin films prepared by radio‐frequency magnetron sputtering

Structural, optical, and magnetic properties of Co‐doped CeO₂ thin films prepared by radio‐frequency magnetron sputtering