Physics / Fizik

Permanent URI for this collectionhttps://hdl.handle.net/11147/6

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Now showing 1 - 3 of 3

Citation - WoS: 3
Citation - Scopus: 4
Electrical Characterization of Interdigitated Humidity Sensors Based on Cnt Modified Calixarene Molecules
(Polish Academy of Sciences, 2013-02) Özbek, Cebrail; Çulcular, Evren; Okur, Salih; Yılmaz, M.; Kurt, M.; 04.05. Department of Pyhsics; 04. Faculty of Science; 01. Izmir Institute of Technology
In this study, we report on the optimization and characterization of chloroform soluble calix[4]arene derivative as a humidity sensor based on electrical properties. Due to the fact that calix[4]arene molecules are nonconductive, we modified the calix[4]arene molecules with carbon nanotubes with electrostatic bond in order to increase the conductance of calix[4]arene molecule (5,11,17,23-tetra-ter-butyl-25,27-dehydrazinamidcarbonilmetoxy-26,28- -dehydroxy-kalix[4]aren). Using photolithography technique, we fabricated interdigitated gold electrodes with 3 micrometers separation to investigate the electrical properties of carbon nanotubes modified calix[4]arene molecule where we used dropcast method to form a thin film of carbon nanotubes modified calix[4]arene molecule on the gold electrodes. Our reproducible experimental results indicated that the chloroform soluble carbon nanotubes modified calix[4]arene films have great potential for humidity sensing applications at room temperature operations.
Citation - WoS: 17
Citation - Scopus: 20
Gas Sensing Properties of Carbon Nanotubes Modified With Calixarene Molecules Measured by Qcm Techniques
(Polish Academy of Sciences, 2012-01) Mermer, Ömer; Okur, Salih; Sümer, F.; Özbek, Cebrail; Sayın, S.; Yılmaz, Mustafa; 04.05. Department of Pyhsics; 04. Faculty of Science; 01. Izmir Institute of Technology
This study focuses on the characterization and optimization of calixarene modified carbon nanotube thin films for gas detection. Calixarene molecules were synthesized individually by considering their functional groups to attract the gas. Calixarene modified carbon nanotube based sensors were fabricated using drop-casting method on a quartz crystal microbalance gold electrode. Carbon monoxide, carbondioxide, oxygen and dry air were used as active gases for adsorption process, while high-purity nitrogen gas was used for desorption process. The selectivity and sensitivity of calixarene modified carbon nanotube are investigated in detail. Our experimental results show that functional calixarene modified carbon nanotube coated quartz crystal microbalance sensors are very sensitive and selective to gas of CO 2 at room temperature operation.
Citation - WoS: 6
Citation - Scopus: 11
Odor Adsorption Kinetics on Modified Textile Materials Using Quartz Microbalance Technique
(Polish Academy of Sciences, 2012-01) Sarıışık, Merih; Okur, Salih; Asma, Ş.; 04.05. Department of Pyhsics; 04. Faculty of Science; 01. Izmir Institute of Technology
In this study, a functional product with aromatic oil and vitamins for use at aromatherapy and spa centers or personal care has been designed to improve life quality of users by using multifunctional products with good odor, moisturizing, relaxation, anti-aging effects. For this purpose, commercial berry berry oil was capsulated in β-cyclodextrin, and then applied to 100% cotton towel fabric. Quartz crystal microbalance sensors were used to investigate odor adsorption kinetics on modified textile materials for the first time. The frequency responses vs. time plot shows clear linear step responses to the change in the concentration of odor molecules coming from the container filled with berry berry applied textile. The results also reveal that TiO 2 coated quartz crystal microbalance sensors can be used as e-nose to sense odor from textile coated with berry berry oil containing β-cyclodextrin capsules.

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Browsing Physics / Fizik by Journal "Acta Physica Polonica A"