Investigations and application in piezoelectric phenol sensor of Langmuir-Sch盲fer films of a copper phthalocyanine derivative functionalized with bulky substituents

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• 作者：G. Giancane^a ; ^{gabriele.giancane@unisalento.it} ; T. Basova^b ; A. Hassan^c ; G. Gü ; mü ; 艧^d ; A.G. Gü ; rek^e ; V. Ahsen^d ; ^e ; L. Valli^a
• 关键词：Langmuir&ndash ; Schä ; fer films ; Phthalocyanine ; Quartz crystal microbalance ; Sensor ; Phenols
• 刊名：Journal of Colloid and Interface Science
• 出版年：2012
• 期刊代码：125_00219797
• 类别：ch
• 出版时间：1 July, 2012
• 卷：377
• 期：1
• 页码：176-183
• 文件大小：865 K

摘要

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-Sch盲fer 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-Sch盲fer 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 100 days.