Organo-layered double hydroxides composite thin films deposited by laser techniques

• Published in: Applied surface science Vol. 374; pp. 326 - 330
• Main Authors: Birjega, R., Vlad, A., Matei, A., Dumitru, M., Stokker-Cheregi, F., Dinescu, M., Zavoianu, R., Raditoiu, V., Corobea, M.C.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 30.06.2016
• Subjects: Atomic force microscopy; Contact angle; Coprecipitation; Hydroxides; Intercalation; Lasers; Thin films; Wettability
• ISSN: 0169-4332; 1873-5584
• DOI: 10.1016/j.apsusc.2015.12.099

•PLD and MAPLE was successfully used to produce organo-layered double hydroxides.•The organic anions (dodecyl sulfate-DS) were intercalated in co-precipitation step.•Zn2.5Al-LDH (Zn/Al=2.5) and Zn2.5Al-DS thin films obtained in this work could be suitable for further applications as hydrophobic surfaces. We used laser techniques to create hydrophobic thin films of layered double hydroxides (LDHs) and organo-modified LDHs. A LDH based on Zn-Al with Zn2+/Al3+ ratio of 2.5 was used as host material, while dodecyl sulfate (DS), which is an organic surfactant, acted as guest material. Pulsed laser deposition (PLD) and matrix assisted pulsed laser evaporation (MAPLE) were employed for the growth of the films. The organic anions were intercalated in co-precipitation step. The powders were subsequently used either as materials for MAPLE, or they were pressed and used as targets for PLD. The surface topography of the thin films was investigated by atomic force microscopy (AFM), the crystallographic structure of the powders and films was checked by X-ray diffraction. FTIR spectroscopy was used to evidence DS interlayer intercalation, both for powders and the derived films. Contact angle measurements were performed in order to establish the wettability properties of the as-prepared thin films, in view of functionalization applications as hydrophobic surfaces, owing to the effect of DS intercalation.