Details

Autor(en) / Beteiligte

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

Titel

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

Ist Teil von

• Journal of colloid and interface science, 2012-07, Vol.377 (1), p.176-183

Ort / Verlag

Amsterdam: Elsevier Inc

Erscheinungsjahr

2012

Link zum Volltext

Quelle

MEDLINE

Beschreibungen/Notizen

• [Display omitted] ► Floating films of a Cu derivative phthalocyanine were characterized as floating film. ► Solid films were deposited by means of Langmuir–Schäefer method. ► The thin films were characterized by Raman and visible spectroscopy. ► Sensor measurements for phenols were carried out by quartz crystal microbalance. ► A rationalization of analyte/active layer interaction was proposed. 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 100days.