Reversible photodoping of TiO2 nanoparticles

Urmas Joost, Andris Sutka, Marek Oja, Krisjanis Smits, Nicola Doebelin, Ardi Loot, Martin Järvekülg, Mika Hirsimäki, Mika Valden, Ergo Nommiste

    Tutkimustuotos: ArticleScientificvertaisarvioitu

    23 Sitaatiot (Scopus)
    14 Lataukset (Pure)

    Abstrakti

    Observations on 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 photo-response to UV light, enabling effective transmittance modula-tion of in a broad wavelength range extending from visible to near-infrared region, and even the thermal black body radiation regime beyond 10 μm. The exceptional photo-response 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. Observed optical effect is reversible and the initial high transmittance state can be restored simply by exposing the NPs to air. Applied NP synthesis route is economic and can be easily scaled for applications such as smart window technol-ogies.
    AlkuperäiskieliEnglanti
    Sivut8968-8974
    JulkaisuChemistry of Materials
    Vuosikerta30
    Numero24
    Varhainen verkossa julkaisun päivämäärä10 jouluk. 2018
    DOI - pysyväislinkit
    TilaJulkaistu - 26 jouluk. 2018
    OKM-julkaisutyyppiA1 Alkuperäisartikkeli

    Julkaisufoorumi-taso

    • Jufo-taso 3

    !!ASJC Scopus subject areas

    • Inorganic Chemistry
    • Materials Chemistry
    • Surfaces and Interfaces
    • Electronic, Optical and Magnetic Materials
    • Condensed Matter Physics

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