Photocatalytically Active Amorphous and Crystalline TiO2 Prepared by Atomic Layer Deposition

  • Orsolya Kéri Department of Inorganic and Analytical Chemistry, Faculty of Chemical Technology and Biotechnology, Budapest University of Technology and Economics, H-1111 Budapest, Szt. Gellért tér 4., Hungary
  • Lenke Kócs Department of Physical Chemistry and Materials Science, Faculty of Chemical Technology and Biotechnology, Budapest University of Technology and Economics, H-1111 Budapest, Budafoki út 6-8., Hungary
  • Zoltán Hórvölgyi Department of Physical Chemistry and Materials Science, Faculty of Chemical Technology and Biotechnology, Budapest University of Technology and Economics, H-1111 Budapest, Budafoki út 6-8., Hungary
  • Zsófia Baji Hungarian Academy of Sciences, Centre for Energy Research, Institute for Technical Physics, H–1121 Budapest, Konkoly–Thege út 29–33., Hungary
  • Krisztina László Department of Physical Chemistry and Materials Science, Faculty of Chemical Technology and Biotechnology, Budapest University of Technology and Economics, H-1111 Budapest, Budafoki út 6-8., Hungary
  • Viktor Takáts Department of Solid State Physics, Faculty of Sciences and Technology, University of Debrecen, H–4026 Debrecen, Bem tér 18/b., Hungary
  • Zoltán Erdélyi Department of Solid State Physics, Faculty of Sciences and Technology, University of Debrecen, H–4026 Debrecen, Bem tér 18/b., Hungary
  • Imre Miklós Szilágyi Department of Inorganic and Analytical Chemistry, Faculty of Chemical Technology and Biotechnology, Budapest University of Technology and Economics, H-1111 Budapest, Szt. Gellért tér 4., Hungary

Abstract

In this work, the photocatalytic properties of amorphous and crystalline TiO2 deposited on oxide and polymer nanoparticles by atomic layer deposition (ALD) were studied. Beside TiO2, as reference, both ALD grown amorphous Al2O3 and crystalline ZnO layers were also examined. When choosing the carrier, the priority was that it had no effect on the photocatalytic activity of TiO2; therefore the oxide layers were deposited on SiO2 and poly(methyl-methacrylate) (PMMA) nanoparticles. The amorphous SiO2 particles were synthetized by the Stöber method, while the PMMA particles were prepared by emulsion polymerization. Both the bare and core/shell composite nanoparticles were investigated by SEM-EDX, TEM, FT-IR, and XRD. Finally, the photocatalytic activity of PMMA, SiO2 and the core/shell nanoparticles was measured by the decomposition of methylene orange, monitored by UV-Vis spectroscopy. Based on the results, the SiO2 was uniformly coated with the deposited oxide films, while in the case of the PMMA a contiguous web-like polymer/TiO2 matrix was formed. During the photocatalytic reactions, the amorphous Al2O3 was not active, while the crystalline ZnO and TiO2 showed good photocatalytic activity. The amorphous TiO2 deposited by ALD on the SiO2 and PMMA nanoparticles had smaller, but a clearly detectable photocatalytic effect on the photodegradation of methylene orange.

Keywords: titanium-dioxide, amorphous, crystalline, atomic layer deposition, photocatalysis
Published online
2019-03-26
How to Cite
Kéri, O., Kócs, L., Hórvölgyi, Z., Baji, Z., László, K., Takáts, V., Erdélyi, Z. and Szilágyi, I. (2019) “Photocatalytically Active Amorphous and Crystalline TiO2 Prepared by Atomic Layer Deposition”, Periodica Polytechnica Chemical Engineering, 63(3), pp. 378-387. doi: https://doi.org/10.3311/PPch.13873.
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Articles