Structural, Morphological, and Optical Investigation of Undoped and Nickel Doped Titanium Dioxide Thin Films
DOI:
https://doi.org/10.38032/scse.2025.3.6Keywords:
Thin Film, Titanium dioxide, Spin coating, DopingAbstract
Titanium dioxide and Ni doped titanium dioxide thin films were prepared from titanium isopropoxide in isopropanol solution and nickel nitrate hexahydrate salt solution by spin coating method. Films were prepared with varying percentage of nickel doped (0%, 1%, and 2%) titanium dioxide on a glass substrate (2.5 cm x 2.5 cm film area). The films were characterized by XRD and SEM to analyze the crystallinity and morphology respectively. XRD study results of the fabricated films confirmed that the undoped films were amorphous and improved crystallinity was found with nickel doping in titanium dioxide. The doped films exhibit a closer proximity to transitioning from the amorphous phase to the polycrystalline phase compared to the undoped film. SEM micrographs revealed that the titanium dioxide thin films, despite undergoing high-temperature annealing, retained significant porosity due to particle agglomeration in the crystalline nanoparticle suspensions used in the spin coating method. The optical characterization was carried out by UV-Visible spectrophotometer. The transmission spectral analysis showed that the films were transparent. Transparency of the film at the doping level of nickel 2% was highest (about 75-85%) in the visible range of spectra. And the corresponding band gap energy was 3.96 eV. With decreasing the nickel percentage, the transparency decreased from 75-85% to 50-65% in the visible range and the band gap energy also shifted to 3.89-3.95 eV.
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Copyright (c) 2025 M. Mim Akter, Tanisha Mujib, Abdullah Al Mahmood, M. Bodiul Islam (Author)
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