Abstract
A stack of nine layers is prepared by sequential spun casting of commercially available colloidal TiO2 nanoparticles of average size of 10–15 nm. Scanning electron microscopy (SEM) is employed to investigate the surface morphology of the multilayers. SEM micrographs exhibit formation of highly uniform and dense TiO2 nanoparticle layers. The uniformity and density is found to be increasing with layer thickness. Structural characterization is carried out using X-ray diffraction (XRD) technique. XRD spectra indicate improvement in crystalline quality of all the layers with increasing layer thickness. All the layers are having mainly the anatase phase of TiO2. Optical characterization is carried out by UV–visible spectroscopy. The value of bandgap estimated on the basis of absorption coefficient is found to be 3.26 eV and approximately remains the same for the layers. The electrical characterization suggests that multilayer resistivity increases with increasing layer thickness. The good quality spin coated thin dense TiO2 layers have many applications in optoelectronics.
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Acknowledgements
Financial support from UWG SEEP and SRAP and COSM FRG programs are acknowledged. Support from the Faculty exchange program between the UWG (USA) and the Birla Collage, Kalyan (India) is acknowledged. Help rendered by Prof. Sandip Ghosh, Ms. Bhagyashri Chalke, TIFR, Mumbai, India is also acknowledged.
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DeSilva, L.A., Thakurdesai, M., Bandara, T.M.W.J. et al. Synthesis of dense TiO2 nanoparticle multilayers using spin coating technique. Appl. Phys. A 124, 314 (2018). https://doi.org/10.1007/s00339-018-1735-x
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DOI: https://doi.org/10.1007/s00339-018-1735-x