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    FILMS SPIN-COATED WITH GALLIC ACID AND THE DETECTION OF SPUN FILMS AGAINST VOLATILE ORGANIC COMPOUNDS
    (World Scientific Publ Co Pte Ltd, 2020) Sen, Sibel
    To determine thin films' properties of commercially available gallic acid molecule, they were deposited onto a suitable substrate using spin coater. UV-Visible absorption spectroscopy and atomic force microscopy (AFM) were employed for the characterization of the deposited thin films. Characterization results obtained by these two techniques indicated that the gallic acid molecules are suitable for transfer onto a glass or quartz substrate. Gas-sensing properties and thickness of these thin films were elucidated using surface plasmon resonance (SPR). Thickness values of spun thin films were obtained at different spinning speeds. Then, the gas-sensing properties were examined by exposing them to the vapors of four volatile organic compounds (VOCs). It was found that the spun films of this material were selective for methanol vapor yielding rapid response and recovery time and thin films of gallic acid exhibited reversible changes in the optical behavior, which makes them suitable for practical methanol-detection applications.
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    Humidity effect on real-time response of tetranitro-oxacalix[4] arene-based surface plasmon resonance (SPR) acetone sensor at room temperature
    (Elsevier Gmbh, 2023) Sen, Sibel; Onder, Ferah Comert; Capan, Rifat; Ay, Mehmet; Erdogan, Cansu Ozkaya
    We report the effect of humidity on the acetone sensitivity of nano-sized thin films obtained by spin coating the oxacalix[4]arenes(1,3) molecules on suitable substrates in this work. The surface morphologies and volatile organic compound (VOC) sensor properties of spin-coated thin films were examined using atomic force microscopy (AFM) and surface plasmon resonance (SPR), respectively. It was determined that the sensitivities calculated from the measurements performed using a mixture of acetone and water vapor were 14% and 11% incorrect for the 1 and 3 thin film sensors, respectively, compared to those performed with dry air and acetone mixture.
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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.
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    Thin Film Properties and the Detection Volatile Organic Compounds of C-Methylcalix(4)Resorcinarene
    (Amer Inst Physics, 2018) Sen, Sibel; Capan, Rifat; Turker, Gulen
    C-Methylcalix(4) resorcinarene (CM4RA) molecule fabricated as a thin film using spin coating method was studied for an application as a sensing membrane for the detection of volatile organic compounds. The optical properties of the CM4RA films were elucidated using UV-vis spectroscopy. In addition surface plasmon resonance technique (SPR) was employed to characterize the thin film deposition process of the CM4RA thin film. Sensing properties and the film thickness of these calixresorcinarene spun films were determined from SPR measurement. Sensing measurement results showed a fast response and recovery times with a reversible response in the optical behaviour of thin films of this material. Our results can be concluded that thin film fabricated using CM4RA molecule is demonstrating a good candidate for room temperature vapour sensing application.