Please use this identifier to cite or link to this item: https://hdl.handle.net/20.500.13091/1375
Title: The monitoring of hydrocarbon vapor by electrospun PBINF modified QCM chemosensor
Authors: Temel, Farabi
Özaytekin, İlkay
Keywords: Chemosensor
Limit Of Detection
Pbi
Pvdf
Qcm
Sensitivity
Voc
Volatile Organic-Compounds
Sensor
Adsorption
Performance
Receptor
Oxide
Vocs
Publisher: ELSEVIER SCIENCE SA
Abstract: This paper describes the preparation of the polybenzimidazole nanofiber (PBINF) onto the QCM sensor by electrospinning of 2,2'-(p-phenylene)-5,5'-bis(benzoxazole) (PBI) and polyvinylidene fluoride (PVDF) as the hydrocarbon sensing material for the first time. The characterization of PBINF was conducted by FTIR, SEM, TGA, AFM, and contact angle analysis. Initial experiments revealed that the higher responses were observed towards toluene and ethylbenzene vapors. The proposed chemosensor performance was then tested towards toluene and ethylbenzene vapors in different concentrations ranging from 1-10 ppm-level. Hence, the chemosensor sensitivity (S, Hz ppm(-1)) and limit of detection (LOD, ppm) were determined as 6.7411 Hz ppm(-1) (toluene), 7.0743 Hz ppm(-1) (ethylbenzene) and 0.41 ppm (toluene), 0.45 ppm (ethylbenzene), respectively. Also, the adsorption phenomena were investigated by adapting the experimental results to some adsorption models. The Freundlich and Langmuir-Freundlich adsorption models were in good correlation with experimental data. Thus, it was thought that PBINF formed a heterogeneous surface, and the toluene sensing by the proposed chemosensor reached equilibria in high volatile organic compound (VOC) concentrations. In further experiments, the sensor performance was evaluated by five sequential adsorption/desorption cycles and every week for six weeks towards 10 ppm toluene vapors. Hence, the chemosensor exhibited good repeatability and durability feature. It was thought that the adsorption of toluene onto the sensor surface was weak physical adsorption, such as pi-pi interaction between the toluene and the benzene rings in the PBI. In conclusion, the PBINF platform onto the QCM sensor will be a useful, promising agent for hydrocarbon detection in many sensing applications. (C) 2021 Elsevier B.V. All rights reserved.
URI: https://doi.org/10.1016/j.sna.2021.112688
https://hdl.handle.net/20.500.13091/1375
ISSN: 0924-4247
1873-3069
Appears in Collections:Mühendislik ve Doğa Bilimleri Fakültesi Koleksiyonu
Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collections
WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collections

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