Improvement of sensing properties for polymer based gas sensors via host–guest principles

• Published in: Journal of inclusion phenomena and macrocyclic chemistry 2020-04, Vol.96 (3-4), p.315-323
• Main Authors: Acikbas, Y., Tetik, G. D., Noory, L., Bozkurt, S., Capan, R., Erdogan, M., Ozkaya, C.
• Format: Article
• Language: English
• Subjects: Atomic force microscopy; Benzene; Chemical sensors; Chemistry; Chemistry and Materials Science; Chloroform; Crystallography and Scattering Methods; Dichloromethane; Diffusion rate; Food Science; Gas sensors; Langmuir-Blodgett films; Mathematical analysis; Microbalances; Microscopy; NMR; Nuclear magnetic resonance; Organic Chemistry; Original Article; Polymer films; Polymers; Quartz crystals; Room temperature; Sensors; Thin films; Toluene
• ISSN: 1388-3127; 1573-1111
• DOI: 10.1007/s10847-019-00974-y

This study aimed at improving the sensing properties of polymer-based gas sensors by controlling the surface adsorption. For this purpose, a polymer was produced as a Langmuir–Blodgett (LB) thin film chemical gas sensor element. The polymer material used was characterized by FTIR, 1 H and 13 C NMR analyses. All LB thin film layers were characterized by UV–Vis spectroscopy, scanning electron microscopy (SEM), quartz crystal microbalance (QCM) and atomic force microscopy (AFM) techniques. The polymeric chemical sensor was exposed to four different harmful organic vapours using QCM. The diffusion coefficients were calculated for each organic vapour using the short time approximation of the Fick’s second diffusion law. The results showed that the response of the polymeric LB films to the harmful vapours was large, fast and reversible and the diffusion coefficients were found to increase in the order dichloromethane, chloroform, benzene and toluene at room temperature. Graphic abstract