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Ultrafast dye regeneration in a core-shell NiO-dye-TiO2 mesoporous film
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Number of Authors: 122018 (English)In: Physical Chemistry, Chemical Physics - PCCP, ISSN 1463-9076, E-ISSN 1463-9084, Vol. 20, no 1, p. 36-40Article in journal (Refereed) Published
Abstract [en]

In this study, a core-shell NiO-dye-TiO2 mesoporous film was fabricated for the first time, utilizing atomic layer deposition technique and a newly designed triphenylamine dye. The structure of the film was confirmed by SEM, TEM, and EDX. Excitation of the dye led to efficient and fast charge separation, by hole injection into NiO, followed by an unprecedentedly fast dye regeneration (t(1/2) <= 500 fs) by electron transfer to TiO2. The resulting charge separated state showed a pronounced transient absorption spectrum caused by the Stark effect, and no significant decay was found within 1.9 ns. This indicates that charge recombination between NiO and TiO2 is much slower than that between the NiO and the reduced dye in the absence of the TiO2 layer (t(1/2) approximate to 100 ps).

Place, publisher, year, edition, pages
2018. Vol. 20, no 1, p. 36-40
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Chemical Sciences Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-151177DOI: 10.1039/c7cp07088hISI: 000418374800002OAI: oai:DiVA.org:su-151177DiVA, id: diva2:1178608
Available from: 2018-01-30 Created: 2018-01-30 Last updated: 2018-01-30Bibliographically approved

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Ling, JunzhongSun, Junliang
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Department of Materials and Environmental Chemistry (MMK)
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