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    Characterization of Langmuir–Blodgett films of a calix[8]arene and sensing properties towards volatile organic vapors

    Year: 2010

    Journal: Sensors and Actuators B, 2010, 148 (2), 358-365, 20131009

    Authors: R. Çapan, Z. Özbek, H. Göktaş, S. Şen, F.G. İnce, M.E. Özel, G.A. Stanciu, F. Davis

    Organizations: Balikesir University, Faculty of Arts and Science, Physics Department, 10145 Çağış, Balikesir, Turkey; Onsekiz Mart University, Faculty of Arts and Science, Physics Department,17100 Çanakkale, Turkey; Çağ University, Faculty of Arts and Science, Maths and Computing Science Department, 33800 Mersin, Turkey; Department of Physics, Center for Microscopy, Microanalysis and Information Processing, University “Politehnica” of Bucharest, Bucharest, Romania; Institute of Bioscience and Technology, Cranfield University at Silsoe, Cranfield Centre for Analytical Science Silsoe, Cranfield MK45 4DT, UK

    Within this article, we report the characterization and organic vapor sensing properties of Langmuir–Blodgett (LB) thin films of calix[8]arenes. Surface pressure–area isotherms show that very stable monolayers are formed at the air–water interface. The LB film could be deposited onto different substrates which allowed the films to be characterized by UV, quartz crystal microbalance (QCM), surface plasmon resonance (SPR) and atomic force microscopy (AFM). The results indicate that good quality, uniform LB films can be prepared with transfer ratios of over 0.95. QCM results showed that the deposited mass of calix[8]arene monolayer onto a quartz crystal decreased from 693 to 204 ng as the number of layers is increased. AFM studies showed a smooth, and void free surface morphology with a rms value of 1.202 nm. The sensing abilities of this LB film towards the development of room temperature organic vapor sensing devices are also studied. Responses of the LB films to various vapors are fast, large, and reversible. It was found that the obtained LB film is significantly more sensitive to chloroform than other vapors. It can be concluded that this molecule could have a potential application in the research area of room temperature vapor sensing devices.