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Photocatalytic properties of hybrid structures based on Titania nanoparticles and semiconductor quantum dots

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Abstract

Titania nanoparticles (NPs) demonstrate the highest photocatalytic activity among metal oxides nanoparticles. A combination of Titania nanoparticles with brightly luminescent semiconductor quantum dots (QDs) makes it possible to obtain highly efficient photocatalytic systems activated by visible light due to photoinduced electron transfer. Multilayered Titania NPs/QDs hybrid structures have been formed using Langmuir–Blodgett technique. Photoluminescent properties of the structures have been analyzed taking into account multiexponential decay of QDs’ photoluminescence and their nonuniform distribution in the structures. It has been shown that luminescent fractions of QDs are strong electron donors for Titania NPs with electron transfer rate \(k_{ET}\ge 4\cdot 10^{10}\, \hbox{s}^{-1}\). It allows for electron transfer with 85% efficiency. At the same time, it was observed that average electron transfer efficiency in the structures is \(55\pm 5\%\) because of presence of a dark fraction in QDs ensemble. Our results clearly demonstrate that Titania NPs/QDs hybrid structures are prospective generator of reactive oxygen species under visible light and reducing QDs’ dark fraction should increase average electron transfer efficiency in the structures.

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Acknowledgements

Thanks the Ministry of Science and Higher Education of the Russian Federation for support via the Scholarships of the President of the Russian Federation for Young Scientists and Graduate Students, SP-991.2019.4. This work was supported by the Ministry of Science and Higher Education of the Russian Federation, goszadanie no. 2019-1080.

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Author notes

  1. Yurii Gun’ko

    Present address: Trinity College, Dublin 2, Ireland

Authors and Affiliations

  1. ITMO University, Birzhevaya liniya 14, 199034, St-Petersburg, Russia

    Anastasiya Makovetskaya, Ekaterina Kolesova, Vladimir Maslov, Aliaksei Dubavik, Yurii Gun’ko & Anna Orlova

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  1. Anastasiya Makovetskaya
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  2. Ekaterina Kolesova
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Correspondence to Anastasiya Makovetskaya.

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This article is part of the Topical Collection on Fundamentals of Laser Assisted Micro-& Nanotechnologies.

Guest edited by Tigran Vartanyan, Vadim Veiko, Andrey Belikov and Eugene Avrutin.

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Makovetskaya, A., Kolesova, E., Maslov, V. et al. Photocatalytic properties of hybrid structures based on Titania nanoparticles and semiconductor quantum dots. Opt Quant Electron 52, 147 (2020). https://doi.org/10.1007/s11082-020-2253-6

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