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    Investigations and application in piezoelectric phenol sensor of Langmuir–Schäfer films of a copper phthalocyanine derivative functionalized with bulky substituents

    Year: 2012

    Journal: Journal of Colloid and Interface Science, 2012, 377 (1), 176-183, 20131009

    Authors: G. Giancane, T. Basova, A. Hassan, G. Gümüş, A.G. Gürek, V. Ahsen, L. Valli

    Organizations: Università degli Studi del Salento, Dipartimento di Ingegneria dell’Innovazione, Edificio “La Stecca”, Via Monteroni, I-73100 Lecce, Italy; Nikolaev Institute of Inorganic Chemistry, SB RAS, 3 Lavrentiev Ave., Novosibirsk 630090, Russia; Faculty of Arts, Computing, Engineering and Sciences, Sheffield Hallam University, Furnival Building, 153 Arundel Street, Sheffield S1 2NU, United Kingdom; TUBITAK-Marmara Research Center, Materials Institute, P.O. Box 21, 41470 Gebze, Kocaeli, Turkey; Gebze Institute of Technology, Department of Chemistry, P.O. Box 141, 41400 Gebze, Kocaeli, Turkey

    An octa-substituted copper phthalocyanine was dissolved in chloroform and spread on ultrapure water subphase in a Langmuir trough. The floating films were characterized at the air–water interface by the Langmuir isotherm, Brewster angle microscopy, and UV–Vis reflection spectroscopy and transferred by Langmuir–Schäfer technique on a silicon substrate, and thickness, refractive index, and extinction coefficient of the phthalocyanine derivative thin film were calculated by means of spectroscopic ellipsometry. A different number of layers were deposited using Langmuir–Schäfer method onto QCM crystals, and the active layers were tested as sensors for the detection of phenols in aqueous solution. The piezoelectric sensor response, totally reversible, is influenced by the number of transferred layers and by the nature of the substituent; on the contrary, the pKa value of the injected analytes slightly affects the device performances. Repeatability of the sensor responses was tested, and the frequency variation appears unchanged at least for 100 days.