Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection
Permanent URI for this collectionhttps://hdl.handle.net/11147/7148
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Article Citation - WoS: 3Citation - Scopus: 3Reusable polymer-based fluorescent sensor nanoprobe for selective detection of cd<sup>2+</sup> ions in real water sources(Royal Society of Chemistry, 2024) Karabıyık, Merve; Ebil, ÖzgençCadmium, which is classified as a highly toxic metal among all heavy metals, poses a threat to the environment and human health, even at trace levels. In this study, for the first time in the literature, a fluorescent sensor nanoprobe that can selectively detect Cd2+ ions in different real water sources has been developed by attaching a CdTe QD-4 amino TEMPO complex to an iCVD deposited cross-linked copolymer surface with high mechanical strength. Under the appropriate conditions such as pH, concentration, type of solvent and reaction time, the interaction between Cd2+ ions and the polymer-based QD-4AT nanoprobe was enhanced, and the detection of this target ion with high selectivity was made possible even in the environments with complex structures containing different heavy metal ions. The limit of detection (LOD) of Cd2+ ions with this proposed polymer sensor nanoprobe was found to be 0.195 mu M by using the linear detection region of 0.0784-2.5 mu M (R-2 > 0.997). In the literature, several sensor probes have been developed for the detection of Cd2+ ions and have only been investigated for single use in liquid media. The polymer sensor nanoprobe developed in this study has high sensitivity and selectivity in terms of detection limit compared to the previous ones, and the results obtained from the multiple use studies indicate that this nanoprobe can be used more than once for ion detection without loss of performance. This is a brand-new product for fluorescence sensing studies and will be a great source of inspiration for them.Article Citation - WoS: 9Citation - Scopus: 10Cvd Deposited Epoxy Copolymers as Protective Coatings for Optical Surfaces(MDPI, 2023) Karabıyık, Merve; Cihanoğlu, Gizem; Ebil, ÖzgençCopolymer thin films of glycidyl methacrylate (GMA), ethylene glycol dimethacrylate (EGDMA) and 2,4,6,8-tetramethyl-2,4,6,8-tetravinylcyclotetrasiloxane (V4D4) were synthesized via initiated chemical vapor deposition (iCVD) as protective coatings for optical surfaces. Chemical durability in various solvents, corrosion resistance, adhesion to substrate, thermal resistance and optical transmittance of the films were evaluated. Crosslinked thin films exhibited high chemical resistance to strong organic solvents and excellent adhesion to substrates. Poly(GMA-co-EGDMA) and poly(GMA-co-V4D4) copolymers demonstrated protection against water (<1% thickness loss), high salt resistance (<1.5% thickness loss), and high optical transparency (~90% in visible spectrum) making them ideal coating materials for optical surfaces. Combining increased mechanical properties of GMA and chemical durability V4D4, the iCVD process provides a fast and low-cost alternative for the fabrication of protective coatings.Article Citation - WoS: 4Citation - Scopus: 4Polymer-Bonded Cdte Quantum Dot-Nitroxide Radical Nanoprobes for Fluorescent Sensors(Springer, 2022) Karabıyık, Merve; Ebil, ÖzgençA novel functional polymer-bonded quantum dots (QDs)-nitroxide radical complex was demonstrated. In the first part of the study, the synthesis of polymer thin films via initiated chemical vapor deposition (iCVD), functionalization of polymer thin films with amine functional groups, and attachment of QDs to polymer surface were demonstrated. Fourier transform infrared spectroscopy and energy-dispersive X-ray spectroscopy together with fluorescence spectroscopy studies revealed that aliphatic primary amine (propylamine) was very effective for the functionalization of iCVD deposited poly(glycidyl methacrylate) (pGMA) and its copolymer with diethylaminoethyl methacrylate (p(GMA-co-DEAEMA)) and also QD attachment to functionalized polymer surface. In the second part of the study, the synthesis and attachment of Quantum Dot-4Amino TEMPO (QD-4AT) nanoprobes to functionalized pGMA thin films and feasibility of using them as fluorescent sensor structures were investigated. It was found that high initial 4AT concentration and long (24 h) interaction times are beneficial for nanoprobe synthesis. Electron paramagnetic resonance (EPR) spectroscopy analysis revealed the existence of covalent bond between QD and 4AT when 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide was used during synthesis. EPR analysis together with fluorescence microscopy investigation confirmed the successful attachment of nanoprobes to polymer surface. Time-depended fluorescence quenching analysis revealed that more than 50% reduction in fluorescence intensity within 15 min demonstrating the potential of polymer bonded QD-4AT nanoprobes in various sensor applications.