In this work, Ru-doped
nickel ferrites (NiFe
2
O
4
) 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 (
M
r,
M
s
and
H
c
) 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 NH
3
and C
2
H
5
OH gases. The reasons for electrical,
magnetic, and sensing behavior of the samples were discussed in detail.
Pristine and vanadium-doped nickel ferrite (NiFe 2 O 4 ) nanoparticles (NPs) were prepared by a chemical co-precipitation method. They were characterized by X-ray diffraction, scanning electron microscopy and X-ray photoelectron spectroscopy to explore their crystallinity, morphology and chemical states. Dielectric constant and dielectric loss properties were studied as a function of frequency and temperature and it was found that V-doping resulted in the enhancement of the dielectric properties. Both pristine and V-doped ferrites showed superparamagnetic nature and zero coercivity and retentivity. However, the saturation magnetization was decreased after V-doping, suggesting presence of superexchange interaction between A-B sites. Both pristine and V-doped NiFe 2 O 4 NPs were also used for NO sensing studies and it was revealed that V-doped gas sensor revealed a better sensing performance (response of 5 s and sensitivity of 43 to 200 ppm NO gas) than pristine one (response of 9 s and sensitivity of 37 to 200 ppm NO gas).
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