Development of cantilever based method and gas sensing Properties of HoFeO3

Das, Krishnapada and J, Suryanarayana (2017) Development of cantilever based method and gas sensing Properties of HoFeO3. Masters thesis, Indian Institute of Technology Hyderabad.

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Abstract

Development of various materials and studying their magnetic and sensing properties has been of great interest in the recent past. Hence, in this projec t I have explored the following, (a) Measurement of magnetostriction using cantilever beam magnetom etry The objective of this work is to develop the cantilever based method to determine magnetostriction of a thin film. TbFeCo film is deposited on kapton substrate and TbDyFe 2 thin films have been deposited on Si substrate by DC magnetron sputtering sys tem. The magnetostriction of TbFeCo thin film has been investigated using optical cantilever method at room temperature. The crystalline behavior and structure property of TbDyFe2 thin film has been explored by X - ray diffraction (XRD). The surface morpholo gy of TbDyFe 2 was studied by Field emission scanning electron microscopy (FESEM). The Energy dispersive X - ray spectroscopy (EDS) confirmed the composition of TbDyFe 2 alloy thin film. (b) Exploring NO2 gas sensing properties of HoFeO3 compound In addition to the above, I also have explored the possibility of using HoFeO3 (HFO) compound for NO2 gas sensing applications. In order to use above, material for gas sensing applications, initially I confirmed the structure of the material with powder XRD. Rietveld re finement is carried out to get exact lattice parameters, bond angles, bond lengths of the material. From the refinement it is confirmed that HFO formed with a space group Pbnm and in orthorhombic structure. Lattice parameters those were extracted from refi nement are a = 5.28322(6), b = 5.59071(7), c = 7.60968(8), α = β = γ = 90°. We also explored the usability of HFO material along with various fungal spices (C3, C7, MTCC, S34, W3 and W5) for NO2 gas sensing. It is observed that parent HFO+W5 shows 25% sens itivity (at 50 ppm of NO2 gas) at room temperature. On the other hand, at 50°C, HFO+C3 showed 25% sensitivity vii (at 50 ppm of NO2 gas). This indeed reveals that at various temperatures and for different fungal spices, the NO2 gas sensing properties of HFO ar e different.

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