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    Characterization of Composite Phthalocyanine–Fatty Acid Films from the Air/Water Interface to Solid Supports

    Year: 2011

    Journal: J. Phys. Chem. B 115 (2011) 14956-14962, 20121205

    Authors: G. Giancane, D. Manno, A. Serra, V. Sgobba, L. Valli

    Organizations: Dipartimento di Ingegneria dell’Innovazione, Universita degli Studi del Salento, I-73100 Lecce, Italy; Dipartimento di Scienze dei Materiali, Universit a degli Studi del Salento, I-73100 Lecce, Italy; Department of Chemistry and Pharmacy & Interdisciplinary Center for Molecular Materials, Friedrich-Alexander-Universität Erlangen-Nürnberg, Egerlandstrasse, 3, D-91058 Erlangen, Germany

    A commercial vanadyl 2,9,16,23-tetraphenoxy-29H,31H-phthalocyanine (VOPc) was dissolved in chloroform and spread on ultrapure water subphase in a Langmuir trough. The floating film was thoroughly characterized at the air–water interface by means of the Langmuir isotherm, Brewster angle microscopy, UV–vis reflection spectroscopy, and infrared measurements carried out directly at the air–water interface. All the results showed the formation of a non-uniform and aggregated floating layer, too rigid to be transferred by the Langmuir–Blodgett (LB) method. For this reason, a mixture of arachidic acid and VOPc was realized, characterized, and transferred by the LB technique on solid substrates. Interface measurements and atomic force microscopy analysis suggested the formation of a uniform arachidic acid film and a superimposed VOPc placed in prone configuration