- Evaporation-Induced Self-Structuring of Organised Silica Nanohybrid Films Through Cooperative Physical and Chemical Interactions doi link

Auteur(s): Cojocariu Ana M., Cattoën Xavier, Le Parc R., Maurin D., Blanc C., Dieudonne-George P., Bantignies J.-L., Wong Chi Man Michel, Bartlett John R.

(Article) Publié: Physical Chemistry Chemical Physics, vol. 18 p.7946 (2016)

Ref HAL: hal-01279551_v1
DOI: 10.1039/C5CP02742J
WoS: 000372229700039
Exporter : BibTex | endNote
4 Citations

In this work, we develop the concept of evaporation-induced self-structuring as a novel approach forproducing organised films by exploiting cooperative physical and chemical interactions under far-fromequilibriumconditions (spin-coating), using sol–gel precursors with multiple functional groups. Thin filmsof self-structured silsesquioxane nanohybrids have been deposited by spin coating through the sol–gelhydrolysis and condensation of a bridged organosilane bearing self-assembling urea groups. The resultingnanostructure, investigated by FTIR, AFM and SEM, is shown to be highly dependent on the catalyst used(nucleophilic or acidic), and can be further modulated by varying the spinning rate. FTIR studies revealed thepresence of highly organised structures under acidic catalysis due to strong hydrogen bonding between ureagroups and hydrophobic interactions between long alkylene chains. The preferential orientation of the ureacross-links parallel to the substrate is shown using polarized FTIR experiments.