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Publikācija: Reversible Photodoping of TiO2 Nanoparticles for Photochromic Applications

Publication Type Scientific article indexed in SCOPUS or WOS database
Funding for basic activity Research project
Defending: ,
Publication language English (en)
Title in original language Reversible Photodoping of TiO2 Nanoparticles for Photochromic Applications
Field of research 2. Engineering and technology
Sub-field of research 2.10 Nano-technology
Authors Urmas Joost
Andris Šutka
Marek Oja
Krisjanis Smits
Nicola Dobelin
Ardi Loot
Martin Järvekülg
Mika Hirsimaki
Mika Valden
Ergo Nõmmiste
Keywords TiO2, nanoparticles, photodoping, photochromic
Abstract Observations on the strong photochromic effect of crystalline TiO2 quantum dots (mean size ≈ 4 nm) are presented. The synthesized quantum dots consist of irregularly shaped anatase TiO2 nanoparticles (NPs) and are dispersed in butanol (8% by mass). Obtained NPs exhibit a dramatic photoresponse to UV light, enabling effective transmittance modulation in a broad wavelength range extending from the visible to near-infrared region, and even the thermal black body radiation regime beyond 10 μm. The exceptional photoresponse is attributed to hole-scavenging by butanol, TiO2 self-reduction, injection of electrons to the conduction band, and consequent localized surface plasmon resonances in NPs. The observed optical effect is reversible, and the initial high transmittance state can be restored simply by exposing the NPs to air. The applied NP synthesis route is economic and can be easily scaled for applications such as smart window technologies.
DOI: 10.1021/acs.chemmater.8b04813
Hyperlink: https://pubs.acs.org/doi/abs/10.1021/acs.chemmater.8b04813 
Reference Joost, U., Šutka, A., Oja, M., Smits, K., Dobelin, N., Loot, A., Järvekülg, M., Hirsimaki, M., Valden, M., Nõmmiste, E. Reversible Photodoping of TiO2 Nanoparticles for Photochromic Applications. Chemistry of Materials, 2018, Vol.30, No.24, pp.8968-8974. ISSN 0897-4756. e-ISSN 1520-5002. Available from: doi:10.1021/acs.chemmater.8b04813
Additional information Citation count:
ID 28538