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Enhanced humidity sensing stability of Dy3+-doped Mg-Rb ferrites for room temperature operatable humidity sensor applications

Hiremath, VG and Malimath, GH and Chethan, B and EL-Gawaad, NSA and Abdallah, SAO and Angadi, VJ (2023) Enhanced humidity sensing stability of Dy3+-doped Mg-Rb ferrites for room temperature operatable humidity sensor applications. In: Journal of Materials Science: Materials in Electronics, 34 (20).

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Official URL: https://doi.org/10.1007/s10854-023-10936-3


In recent years, increased focus has been placed on the investigation of ferrite nanoparticles’ possible use as humidity-sensing materials. In this work we report the humidity-sensing characteristics of Dysprosium doped Mg-Rb ferrites synthesized by solution combustion synthesis route. The produced Mg0.9Rb0.1DyxFe2-xO4 powder have been examined using energy dispersive X-ray spectroscopy (EDX), field effect scanning electron microscopy (FESEM), powder X-ray diffraction (PXRD), and Fourier transform infrared (FTIR). According to the results of powder XRD, unit cell volume (590–502Ao) and crystallite size (40–26 nm) decrease when Dysprosium ion concentration increases. The nanomaterial has a single phase with the Fd3m space group, according to the PXRD. The presence of Mg, Rb, Fe, Dy, and O elements is confirmed by EDX. The samples are highly porous nature (8 to 24%) and high surface volume (0.71–0.76). The spinel ferrite structure is clearly visible in the FTIR spectra, and the bands in the high-frequency region illustrate how hygroscopic the produced materials are. The fabricated powder is employed in the creation of a humidity sensor as a sensing component. It is noted that, the composition of Dy3+ increases the enhance in the resistance and is maximum for Mg0.9Rb0.1Dy0.03Fe1.97O4 composite and is determined to have the highest average sensitivity (600 M/%RH). The composition of the Dysprosium (Dy) increases the resistance is enhanced and is maximum for the Mn0.9 Rb0.1 Dy0.03Fe2-0.03O4 composite. Hence our results are good enough for sensor applications. The manufactured thin film humidity sensor has response and recovery durations of 18 and 90 s, respectively. The discovered sensing material has outstanding stability and strong repeatability (98%).

Item Type: Journal Article
Publication: Journal of Materials Science: Materials in Electronics
Publisher: Springer
Additional Information: The copyright for this article belongs to the Springer.
Keywords: Binary alloys; Combustion synthesis; Energy dispersive spectroscopy; Ferrite; Fourier transform infrared spectroscopy; Humidity sensors; Scanning electron microscopy, Doped mg; Energy dispersive X ray spectroscopy; Ferrite nanoparticles; Humidity sensing; Sensing characteristics; Sensing material; Sensor applications; Solution combustion synthesis; Synthesis route; Synthesised, Crystallite size
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 01 Aug 2023 05:12
Last Modified: 01 Aug 2023 05:12
URI: https://eprints.iisc.ac.in/id/eprint/82730

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