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Y. ACIKBAS1,* , N. ZEYBEK1, C. OZKAYA2, A. SIRIT3, M. ERDOGAN2, R. CAPAN2, S. BOZKURT4,5
- Department of Material Science and Nanotechnology Engineering, Faculty of Engineering, University of Usak, Turkey
- Department of Physics, Faculty of Science, University of Balikesir, Turkey
- Department of Chemistry, Necmettin Erbakan University, 42099, Meram, Konya, Turkey
- Vocational School of Health Services, Usak University, 64200 Usak, Turkey
- Scientific Analysis Technological Application and Research Center, Usak University, 64200 Usak, Turkey
Surface Plasmon Resonance (SPR) optical chemical sensors based on 25,27-Bis(N-[[(2R)-2-hydroxy-3-[[(1R)-1-(hydroxymethyl)propyl]amino]propyl]asetamide))-26,28-dihydroxy-5,11,17,23-tetra(tert-butyl)calixarene (NHDACx) films were fabricated to sense dichloromethane, acetone, and benzene at room temperature. Calixarene based macrocyclic thin films, as gas sensing film, were fabricated by Langmuir-Blodgett (LB) thin film technique with different thicknesses, and characterized by SPR and UV-Visible spectrophotometer. The experimental SPR data were fitted using the Winspall software to evaluate optical properties of the NHDACx film such as the parameter of thickness and refractive index. Values of the thickness and refractive index of NHDACx LB films were determined as 1.29 ± 0.06 nm for the thickness per monolayer, and 1.54 ± 0.07 for the refractive index. Exposed to above mentioned organic vapors, the responses of the optical sensors, ΔI, were measured. Optical sensor with 7.9 nm NHDACx film shows higher response to the saturated concentration of all vapors than the others, due to the amount of the adsorbed vapor molecules onto the surface of NHDACx film. Sensing mechanisms are based on changing photodetector response and optical properties of the gas sensing element. As a result, NHDACx optical LB thin film sensors exhibits high response, a good sensitivity and selectivity for saturated dichloromethane vapor than other vapors. These optical thin film sensors were potential candidates for organic vapor sensing applications with simple and low cost preparation at room temperature..
Calixarene, Macrocyclic molecule, LB thin film, Vapor sensor, Surface plasmon resonance.
Submitted at: April 22, 2020
Accepted at: Feb. 15, 2021
Y. ACIKBAS, N. ZEYBEK, C. OZKAYA, A. SIRIT, M. ERDOGAN, R. CAPAN, S. BOZKURT, Optical and organic vapor properties of Calixarene based macrocyclic Langmuir-Blodgett thin films, Journal of Optoelectronics and Advanced Materials Vol. 23, Iss. 1-2, pp. 14-21 (2021)
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