Composition-tuned metal-organic thin-film structures based on photoswitchable azobenzene by ALD/MLD

Tutkimustuotos: LehtiartikkeliArticleScientificvertaisarvioitu

27 Lataukset (Pure)

Abstrakti

We demonstrate the fabrication of in-situ crystalline thin films of various azobenzene (AZO) based metal-organic structures using the atomic/molecular layer deposition (ALD/MLD) technique; these are highly intriguing materials as azobenzene is one of the prototype organic molecules experiencing photoisomerization. Our Li-, Ca and Fe-AZO thin films deposited from Li(thd) (thd = 2,2,6,6-tetramethyl-3,5-heptanedione), Ca(thd)2, FeCl3 and azobenzene-4,4'-dicarboxylic acid precursors in the temperature range of 250-360 °C exhibit metal-AZO structures not known from bulk samples. In all these structures, the AZO linker molecules are free to undergo the characteristic trans-cis photoisomerization reaction upon UV (360 nm) irradiation. However, this lowers the degree of crystallinity. To address the issue, we investigate hetero-organic structures where TPA (terephthalic acid) is used as another linker component together with AZO. This allows the trans-cis reaction of the AZO moieties to occur without compromising the film crystallinity. Finally, we demonstrate the growth of MOF-on-MOF type Ca-ADA@Ca-TPA thin films also showing the efficient photoisomerization reaction.

AlkuperäiskieliEnglanti
Sivut11310-11316
Sivumäärä7
JulkaisuDalton Transactions
Vuosikerta49
Numero32
DOI - pysyväislinkit
TilaJulkaistu - 18 elokuuta 2020
OKM-julkaisutyyppiA1 Julkaistu artikkeli, soviteltu

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  • Projektit

    • 2 Päättynyt

    Uusia hybridimateriaaleja ALD/MLD:n avulla: perusteista sovelluksiin

    Aleksandrova, I., Medina, E., Thomas, C., Karppinen, M., Haggren, A., Tiittanen, T., Multia, J., Ghazy, A., Mustonen, O., Khayyami, A., Revitzer, H., Sederholm, L., Johansson, L. & Madadi, M.

    01/09/201624/09/2020

    Projekti: Academy of Finland: Other research funding

    Molecular-Layer-Engineered Inorganic-Organic Hybrid Materials

    Hagen, D., Khayyami, A., Marin, G., Ghazy, A., Nisula, M., Johansson, L., Safdar, M., Krahl, F., Thomas, C., Medina, E., Tiittanen, T., Giedraityte, Z., Heiska, J., Lepikko, S., Karppinen, M., Haggren, A., Tripathi, T., Multia, J., Philip, A., Srivastava, D., Aleksandrova, I., Mustonen, O., Jin, H. & Ahvenniemi, E.

    23/12/201324/05/2019

    Projekti: EU: ERC grants

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