Liquid crystalline octasubstituted lead(ii) phthalocyanines: effects of alkoxy and alkylthio substituents on film alignment and electrical properties

TUNCEL, Sinem, BANIMUSLEM, Hikmat A. J., DURMUŞ, Mahmut, GÜREK, Ayşe Gül, AHSEN, Vefa, BASOVA, Tamara V. and HASSAN, Aseel (2012). Liquid crystalline octasubstituted lead(ii) phthalocyanines: effects of alkoxy and alkylthio substituents on film alignment and electrical properties. New Journal of Chemistry, 36 (8), p. 1665.

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Official URL: http://dx.doi.org/10.1039/C2NJ40247E
Link to published version:: 10.1039/C2NJ40247E

Abstract

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 pK(a) 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.

Item Type: Article
Research Institute, Centre or Group: Materials and Engineering Research Institute > Thin Films Research Centre > Electronic Materials and Sensors Research Group
Identification Number: 10.1039/C2NJ40247E
Depositing User: Helen Garner
Date Deposited: 21 Sep 2012 16:15
Last Modified: 21 Sep 2012 16:15
URI: http://shura.shu.ac.uk/id/eprint/6181

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