光致变色
锐钛矿
透射率
纳米颗粒
可见光谱
材料科学
光电子学
纳米技术
红外线的
量子点
光化学
光学
光催化
化学
物理
有机化学
催化作用
作者
Urmas Joost,Andris Šutka,Marek Oja,Krišjānis Šmits,Nicola Döbelin,Ardi Loot,Martin Järvekülg,M. Hirsimäki,Mika Valden,E. Nõmmiste
标识
DOI:10.1021/acs.chemmater.8b04813
摘要
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.
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