Abstract
In this study, TiO2 nanotubes (TiO2-NTs) are coated with a drop-casting method on Fe40Ni38Mo4B18 amorphous ferromagnetic ribbons and the humidity response of the prepared magnetoelastic sensors (MES) is investigated. The synthesis of TiO2-NTs is performed using a hydrothermal process. Sample characterization is carried out using X-ray diffraction and scanning electron microscopy. The results show that the sensors can measure moisture values in the range of 5% to 95% with very high precision and very low hysteresis. The humidity variation between 5% and 95% shows a change in the sensor resonance frequency of ~3180 Hz, which is a significant change compared to many magnetoelastic humidity sensors developed so far.
Highlights
Ferromagnetic amorphous alloys containing Fe, Ni, and/or Co are excellent magnetoelastic materials
Conclusions coated onto a 2826MB amorphous ribbon, and they tested the sensor at two different humidity levels, In conclusion, a TiO2-NT film on Fe40Ni38Mo4B18 amorphous ferromagnetic ribbons was successfully fabricated using a drop-casting method
The effect of coated layer mass was reported for the first time for magnetoelastic sensor and different amounts of TiO2-NTs were coated on the amorphous ribbon and it was found that the resonant frequency change for 5–95% RH cycles increases with increasing mass of the coated TiO2-NTs
Summary
Ferromagnetic amorphous alloys containing Fe, Ni, and/or Co are excellent magnetoelastic materials Magnetoelastic materials change their shape when exposed to a magnetic field and, undergo magnetization changes when a mechanical stress is applied. This bidirectional coupling provides the transduction capability when working as sensing devices [1,2,3,4]. In magnetoelastic sensors, the amount of mass usually deposited on the sensor surface causes a shift in the resonance frequency and the shift in the magnetoelastic measurement system is measured. MES, in this study, we use TiO2 in its nanotube form for the first time and we present detailed results compared to previous studies
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