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    Electrical properties of alternating acid and amino substituted calixarene Langmuir-Blodgett thin films
    (Pergamon-Elsevier Science Ltd, 2020) Ozbek, Zikriye; Davis, Frank; Capan, Rifat
    The Langmuir-Blodgett (LB) alternate layer fabrication technique provides one of the most effective methods to fabricate organic thin films in the nanoscale. The structure of these thin films could be controlled at the molecular scale by spreading a monolayer on an air-water interface followed by sequential transferring of this layer onto a selected solid substrate. These films can be utilized within optical, electrical and biological applications in many different fields. Within this paper, two calix[4]arenes containing either carboxylic acid or amino substituents were utilised to prepare multilayer LB films and to study the electrical characteristic of these films using I-V and C-f measurements. The resultant calix[4]acid/amine multilayers demonstrated a highly non-linear I-V behaviour which obeys a Schottky conduction mechanism.
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    Langmuir-Blodgett thin film for chloroform detection
    (Elsevier Science Bv, 2015) Capan, Rifat; Goktas, Hilal; Ozbek, Zikriye; Sen, Sibel; Ozel, Mehmet Emin; Davis, Frank
    Calix[4]resorcinarene (C11TEA) molecules could be deposited as an LB film by the Langmuir-Blodgett (LB) technique onto suitable substrates. Surface plasmon resonance (SPR) and UV-vis spectroscopy were employed for the characterization of these LB films. A high quality and uniform Langmuir monolayer from the water surface can be transferred onto a glass or gold coated substrates with a transfer ratio of over 95%. Thickness and refractive index values of the resultant LB films were measured using surface plasmon resonance with a value of 1.04nm per layer and 1.4 respectively. For the sensing application towards chloroform, this LB film yields a fast and almost fully reversible response to chloroform in few seconds. (C) 2015 Elsevier B.V. All rights reserved.