Fabrication of Langmuir–Blodgett thin films of calix[4]arenes and their gas sensing properties: Investigation of upper rim para substituent effect
| Autor: | Mevlut Bayrakci, Mustafa Ersoz, Şeref Ertul, Mustafa Ozmen, Zikriye Özbek, Sumeyra Buyukcelebi, Rifat Capan |
|---|---|
| Přispěvatelé: | Fen Edebiyat Fakültesi, 0-Belirlenecek, [Ozmen, Mustafa -- Buyukcelebi, Sumeyra -- Ertul, Seref -- Ersoz, Mustafa] Selcuk Univ, Dept Chem, TR-42075 Konya, Turkey -- [Ozbek, Zikriye] Univ Canakkale Onsekiz Mart, Dept Bioengn, TR-17100 Canakkale, Turkey -- [Bayrakci, Mevlut] Nigde Univ, Ulukisla Vocat Sch, TR-51100 Nigde, Turkey -- [Capan, Rifat] Univ Balikesir, Dept Phys, TR-10145 Balikesir, Turkey |
| Rok vydání: | 2014 |
| Předmět: |
Chloroform
Quartz Crystal Microbalance Chemistry Scanning electron microscope Metals and Alloys Analytical chemistry Calix[4]Arene Quartz crystal microbalance Condensed Matter Physics Langmuir–Blodgett film Toluene Surfaces Coatings and Films Electronic Optical and Magnetic Materials Vapor Sensing Contact angle Langmuir-Blodgett chemistry.chemical_compound Monolayer Materials Chemistry Electrical and Electronic Engineering Thin film Instrumentation |
| Zdroj: | Sensors and Actuators B: Chemical. 190:502-511 |
| ISSN: | 0925-4005 |
| DOI: | 10.1016/j.snb.2013.09.008 |
| Popis: | WOS: 000326687700067 This study reports the characterization and organic vapor sensing properties of Langmuir-Blodgett (LB) thin films of calix[4] arene derivatives that contain different numbers of tert butyl groups on their upper rims. Surface pressure-area isotherms show that very stable monolayers are formed at the air-water interface. The LB films are deposited onto different substrates, which allowed us to characterize the films by contact angle measurements, quartz crystal microbalance (QCM), scanning electron microscopy (SEM), and atomic force microscopy (AFM). The results indicate that good quality, uniform LB films can be prepared with transfer ratios of over 0.95. Meanwhile, our QCM results show that the deposition of LB film layers depends heavily on the number of p-tert-butyl groups and calix[4]arene with four p-tert-butyl groups yields the highest slope with a mass value of 1145 ng per layer. Furthermore, our AFM and SEM studies reveal a dense surface morphology for all prepared LB films. The kinetic response of calix[4]arenes containing p-tert-butyl groups and without p-tert-butyl groups as an LB film to chloroform, benzene, toluene, and ethanol vapors were investigated as a function of time. After attaching tert-butyl groups onto the calix[4]arene structure, the response of LB film to chloroform vapor increased. LB films of compounds 1-4 yield a response to all vapors and more often select chloroform with a larger, faster, and more reproducible response. We thus conclude that these calix[4]arenes could be applied to research concerning vapor sensing devices operating at room temperature. (C) 2013 Elsevier B.V. All rights reserved. Research Foundation of Selcuk University (BAP) The authors would like to thank The Research Foundation of Selcuk University (BAP) for financial support of this work. We are also thankful to Cansu Ozkaya for her help during isotherm measurements. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect