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: 1Citation - Scopus: 1Plasma-Enhanced Cvd Synthesis and Cytotoxic Evaluation of Graphitic Carbon Embedded – Fe3O4 Nanoparticles(Elsevier Sci Ltd, 2025) Balci-Cagiran, Ozge; Mertdinc-Ulkuseven, Siddika; Solati, Navid; Onbasli, Kubra; Yagci-Acar, Havva; Agaogullari, DuyguThis study reports the synthesis of graphitic carbon embedded - Fe3O4 nanoparticles using a novel method that enables a low-temperature rapid process and includes cytotoxicity tests to evaluate their potential use in biomedical applications. In this study, graphitic carbon was grown on Fe3O4 core using a plasma-enhanced chemical vapor deposition (PE-CVD) system under an Ar-H-2-CH4 gas plasma at 650 degrees C for 15 min. X-ray diffractometry (XRD) and Raman spectroscopy investigations confirmed that Fe3O4 nanoparticles were embedded in graphitic carbon (Fe3O4@C). Scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS), along with transmission electron microscopy (TEM) equipped with EDS, also supported the carbon formation and nano-sized structure of the synthesized particles. Fe3O4@C nanoparticles exhibited soft magnetic properties with saturation magnetization (M-s) and coercivity (H-c) values of 69.27 emu/g and 97 Oe, respectively. Cytotoxicity assessment on HeLa and MCF7 cancer cells suggested biocompatibility at and below a dose of 100 mu g/mL after 24 h of exposure but a drop in cell viability at higher doses and longer incubation times, more on cancer cell lines than the healthy L929 cells. These results suggest that Fe3O4@C nanoparticles might be potential candidates for biomedical applications, including drug delivery, photothermal therapy, and magnetically-triggered operations.Article Citation - WoS: 17Citation - Scopus: 19Strong Coupling of Carbon Quantum Dots in Liquid Crystals(American Chemical Society, 2022) Sarısözen, Sema; Polat, Nahit; Mert Balcı, Fadime; Güvenç, Çetin Meriç; Kocabaş, Çoşkun; Yağlıoğlu, Halime Gül; Balcı, SinanCarbon quantum dots (CDs) have recently received a tremendous amount of interest owing to their attractive optical properties. However, CDs have broad absorption and emission spectra limiting their application ranges. We herein, for the first time, show synthesis of water-soluble red emissive CDs with a very narrow line width (∼75 meV) spectral absorbance and hence demonstrate strong coupling of CDs and plasmon polaritons in liquid crystalline mesophases. The excited state dynamics of CDs has been studied by ultrafast transient absorption spectroscopy, and CDs display very stable and strong photoluminescence emission with a quantum yield of 35.4% and a lifetime of ∼2 ns. More importantly, we compare J-aggregate dyes with CDs in terms of their absorption line width, photostability, and ability to do strong coupling, and we conclude that highly fluorescent CDs have a bright future in the mixed light-matter states for emerging applications in future quantum technologies.