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Formation and optical properties of pure nano-sized anatase titania by low-temperature aqueous sol-gel route

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Abstract

Nanocrystalline anatase titania particles were synthesized by low-temperature aqueous sol-gel transformations from new types of precursors [Ti{OPri}4] (A), [{acac}2Ti{OPri}{ONC9H6}] (1), and [{acac}2Ti{ONC9H6}2] (2) {where, ONC9H6 = 8-hydroxyquinoline}. Formation of all the precursors was confirmed by elemental analysis, molecular weight measurements, FTIR, and NMR (1H and 13C). Titania samples (a), (b), and (c) were formed by aqueous sol-gel transformations of (A), (1), and (2), respectively. The resulting nano-materials were characterized using XRD, TEM, SEM, EDX, SAED, FTIR, and UV-Visible spectroscopic techniques. From the X-ray pattern, the phase purity of the synthesized powders was confirmed as anatase TiO2. Crystallite size of all the oxide samples was measured by XRD and TEM, found to be 26 nm (a), 11 nm (b), and 8 nm (c). Surface morphologies of all the samples were evaluated by SEM. Selected area diffraction (SAED) of (b) and (c) are also corroborated the XRD results. The absorption spectra of oxide samples, (a), (b), and (c) show energy band gap of 2.9 eV, 3 eV, and 3.1 eV, respectively. SAED-EDX analysis confirmed the formation of pure anatase-phase titania nanoparticles.

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Acknowledgements

We are highly thankful to the Material Research Centre, MNIT, Jaipur, for providing facilities of Powder X-ray Diffraction, TEM, SEM, and EDX.

Funding

This study was financially supported by MHRD, Government of India, New Delhi, India.

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Authors and Affiliations

  1. Department of Chemistry, Malaviya National Institute of Technology, Jaipur, 302017, Rajasthan, India

    Tanuja Kumari & Jyoti Joshi

  2. Department of Chemistry, University of Rajasthan, Jaipur, 302004, Rajasthan, India

    Ram Gopal

  3. Department of Metallurgical and Materials Engineering, Malaviya National Institute of Technology, Jaipur, 302017, Rajasthan, India

    Ankit Goyal

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  1. Tanuja Kumari
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  2. Ram Gopal
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  3. Ankit Goyal
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  4. Jyoti Joshi
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Correspondence to Jyoti Joshi.

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Kumari, T., Gopal, R., Goyal, A. et al. Formation and optical properties of pure nano-sized anatase titania by low-temperature aqueous sol-gel route. J Aust Ceram Soc 55, 689–695 (2019). https://doi.org/10.1007/s41779-018-0278-0

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