Humidity sensing behaviour of Rubidium-doped Magnesium ferrite for sensor applications

Hiremath, VG and Yahia, IS and Zahran, HY and Chethan, B and Malimath, GH and Ravikiran, YT and Angadi, VJ (2022) Humidity sensing behaviour of Rubidium-doped Magnesium ferrite for sensor applications. In: Journal of Materials Science: Materials in Electronics, 33 (14). pp. 11591-11600.

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Abstract

In the present work, the influence of Rb3+ on the structural, microstructure, and humidity sensing properties of MgxRb1−xFe2O4 (x = 0.025 to 0.1) is reported. Samples were prepared by the self-propagating high temperature synthesis method. Structure is analogized through X-ray powder diffraction (XRD); microstructural and elemental composition via; Scanning Electron Microscopy (SEM) and Energy dispersive spectra (EDS), respectively. XRD patterns of all samples reveal the spinel cubic structure with single phase formation. The lattice parameters were found to decrease with an increase in Rb3+ concentration. Further estimated crystallite sizes were found in the nano range. Further estimated crystallite size range was found to be between 25 to 40 nm range. Changes in the distribution of grain and the rise in intergranular pores in the composite for adsorption of water are verified by electron SEM images. EDS was utilized to examine the elemental compositions of the prepared samples. Fourier Transform infrared Spectroscopy spectra shows two absorption bands, the high frequency band has a frequency range of 560–600 cm−1, whereas the low frequency band has a frequency range of 380–420 cm−1 which confirms the formation of spinel cubic structure. Mg0.9Rb0.1Fe2O4 displays a good sensing response. The composite response and recovery durations for Mg0.9Rb0.1Fe2O4 were 20 and 30 s, respectively. Chemisorption, physisorption, and capillary condensation methods were used to investigate the sensing process. For humidity, Mg0.9Rb0.1Fe2O4 samples showed steady sensing abilities and minimal hysteresis. Rb is a key component in boosting the humidity sensing effectiveness of Mg ferrite, making the composite ideal for use in humidity sensor devices. © 2022, The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature.

Item Type:	Journal Article
Publication:	Journal of Materials Science: Materials in Electronics
Publisher:	Springer
Additional Information:	The copyright for this article belongs to Springer
Keywords:	Ferrite; Fourier transform infrared spectroscopy; Humidity sensors; Iron compounds; Magnesium; Rubidium; Scanning electron microscopy; Textures; X ray diffraction; X ray powder diffraction, Cubic structure; Elemental compositions; Energy dispersive; Frequency ranges; Humidity sensing; Humidity sensing property; Magnesium ferrite; Sensor applications; Spectra's; Structural sensing, Crystallite size
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	18 May 2022 10:00
Last Modified:	18 May 2022 10:00
URI:	https://eprints.iisc.ac.in/id/eprint/71849

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