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    In Situ Growth and Interlayer Modulation of Layered Double Hydroxide Thin Films from a Transparent Conducting Oxide Precursor

    Year: 2021

    Journal: Cryst. Growth Des., Volume 21, MAR 3, page 1518–1526

    Authors: Ellis, James E.; Kim, Ki-Joong; Cvetic, Patricia C.; Ohodnicki, Paul R.

    Organizations: U.S. Department of Energy's Fossil Energy Crosscutting Technology Research Program; U.S. Department of Energy; Department of Energy, NETL, an agency of the United States Government; RSS contract [89243318CFE000003]; LRST

    Layered double hydroxides (LDHs) are a class of cationic-layered solids that can be synthetically designed for a variety of advanced functions. Facile thin film growth of LDHs is an important requisite for a variety of applications including functional coatings, displays, and sensing. In this work we demonstrate, for the first time, an in situ and patternable thin film synthesis of interconnected Zn-Cr LDH particles from a transparent conducting oxide precursor, aluminum-doped zinc oxide, at room temperature within minutes. Synthetic parameters such as chromium(III) nitrate concentration, solvent composition, and reaction time were found to significantly affect the thickness and morphology of the resulting LDH films. These LDH thin films can undergo interlayer anion exchange, which modulates the interlayer distance of the LDH sheets and surface energy of the thin film. Replacement of the interlayer anion with perfluorooctanoate increases the interlayer sheet distance from 0.9 to 2.8 nm and induces a super-hydrophobic thin film that is capable of adsolubilizing and retaining organic guest molecules. The synthetic method and structural analysis of the LDH thin films introduced in this work opens new avenues of application for LDH films.
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