Photocatalytic Properties of Thermally Annealed Films of Titanium Butoxide
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Photocatalytic Properties of Thermally Annealed Films of Titanium Butoxide1 A. A. Lazarevaa, *, E. P. Kolesovaa, M. A. Baranova, and A. O. Orlovaa a ITMO
University, St. Petersburg, 197101 Russia * e-mail: [email protected]
Received January 18, 2020; revised January 18, 2020; accepted April 20, 2020
Abstract—We show that titanium dioxide particles capable of reactive oxygen species generation can be produced in titanium butoxide films by annealing them at 500°C. Optimal conditions for the films deposition by a modified Langmuir–Blodgett technique were selected basing on the film uniformity examined by optical and electron microscopy. The photocatalytic activity of the annealed film was tested using RNO sensor bleaching. Keywords: reactive oxygen species, bacterial infections, titanium dioxide, UV radiation DOI: 10.1134/S0030400X20080226
INTRODUCTION Currently, nanomaterials-based structures capable of combating bacterial infections are attracting researchers’ close attention. Among such structures are titanium dioxide nanoparticles that can generate reactive oxygen species (ROS) upon exposure to UV radiation [1]. One of the possible mechanisms of killing bacteria is the oxidative stress caused by ROS generated by nanoparticles. This fact makes titanium dioxide nanoparticles promising material for antibacterial therapy. Annealing precursor films, in particular titanium butoxide, results in nanostructured titanium dioxide films [2]. The formation of films from precursors has several advantages as compared to films based on colloidal titanium dioxide nanoparticles. This is primarily due to the complexity of controlling the deposition of titanium dioxide nanoparticles on dielectric substrates since this material does not absorb in the visible region of the spectrum and does not luminesce. The second significant drawback of colloidal nanoparticles of titanium dioxide is the presence of stabilizer molecules both on the surface of the nanoparticles and free stabilizer molecules in solution. In the formation of hybrid structures based on titanium dioxide nanoparticles and semiconductor quantum dots (QD), stabilizer molecules form an energy barrier, preventing electron transfer from QD to titanium dioxide nanoparticles [3]. This leads to a deterioration in the photocatalytic properties of the struc1 The 2nd International School-Conference for young researchers
“Smart Nanosystems for Life,” St.Petersburg, Russia, December 10–13, 2019.
tures under the influence of electromagnetic radiation in the visible range. Therefore, it seems appropriate to study the conditions for the formation of nanostructured titanium dioxide on a dielectric substrate and its photocatalytic properties. The formation of hybrid structures with the participation of nanostructured titanium dioxide, free of organic shell and the presence of free stabilizer molecules in the sample, can significantly increase the electron transfer efficiency in hybrid structures with QD and, as a result, increase the photocatalytic activity of these str
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