Role of ruthenium in the dielectric, magnetic properties of nickel ferrite (Ru-NiFe2O4) nanoparticles and their application in hydrogen sensors

Venkatraman Manikandan, Ali Mirzaei, Sivasubramaniam Vigneselvan, Srikanti Kavita, Rajaram Sakharam Mane, Sang Sub Kim, Joseph Chandrasekaran

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34 Scopus citations

Abstract

In this work, Ru-doped nickel ferrites (NiFe2O4) were synthesized by a chemical co-precipitation method. Subsequently, they were annealed at different temperatures. The crystallinity of the samples was evaluated using X-ray diffraction and the morphology of the samples was investigated by scanning electron microscopy and transmission electron microscopy. Dielectric constants and dielectric loss were studied. Ru-doped nickel ferrite samples showed relatively low dielectric constant and loss. Also, the dielectric constant and loss decreased with increasing annealing temperature. Vibrational sample magnetometer analysis shows the hysteresis loop of a soft magnetic nature and the relevant parameters (Mr, Ms and Hc) have low values that confirmed the nature of the material. Subsequently, gas sensors were fabricated to study hydrogen-sensing properties. The gas sensors showed a response to hydrogen gas at a low temperature (100 °C) with selective response in the presence of NH3 and C2H5OH gases. The reasons for electrical, magnetic, and sensing behavior of the samples were discussed in detail.

Original languageEnglish
Pages (from-to)12919-12926
Number of pages8
JournalACS Omega
Volume4
Issue number7
DOIs
StatePublished - 31 Jul 2019

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© 2019 American Chemical Society.

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