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    Magnetic Cu/Co nanoparticles supported on nitrogen-doped porous carbon derived from Cu/Co@aZIF: Investigation of catalytic activity and structural properties
    (Wiley, 2023) Bugday, Nesrin; Yasar, Sedat; Altin, Serdar; Duygulu, Ozgur; Onal, Yunus
    By calcining copper-doped amorphous zeolitic imidazolate framework (Cu/Co@aZIF), a novel magnetic nanoporous carbon composite (Cu/Co@NPC) material was produced, characterized by different spectroscopic techniques, and used for the first time as an efficient catalyst for the azide-alkyne cycloaddition (AAC) reaction and the reduction reaction of nitrophenol (RRN) under air in water. With this catalyst, the AAC and RRN reactions were conducted in aqueous solutions, and good to excellent yields of related products were synthesized in a short reaction time. The potential of the magnetic Cu/Co@NPC nanocatalyst for targeting RRN and AAC reactions was uncovered by studying specific substrates for RRN and AAC reactions. The Cu/Co@NPC magnetic nanocatalyst is recyclable at least five times, with just a drop of 6% and 22% in catalytic efficiency in RRN and AAC, respectively.
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    Pioneering electrochemical detection unveils erdafitinib: a breakthrough in anticancer agent determination
    (Springer Wien, 2024) Yildir, Merve Hatun; Genc, Asena Ayse; Erk, Nevin; Bouali, Wiem; Bugday, Nesrin; Yasar, Sedat; Duygulu, Ozgur
    The successful fabrication is reported of highly crystalline Co nanoparticles interconnected with zeolitic imidazolate framework (ZIF-12) -based amorphous porous carbon using the molten-salt-assisted approach utilizing NaCl. Single crystal diffractometers (XRD), and X-ray photoelectron spectroscopy (XPS) analyses confirm the codoped amorphous carbon structure. Crystallite size was calculated by Scherrer (34 nm) and Williamson-Hall models (42 nm). The magnetic properties of NPCS (N-doped porous carbon sheet) were studied using a vibrating sample magnetometer (VSM). The NPCS has a magnetic saturation (Ms) value of 1.85 emu/g. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) analyses show that Co/Co3O4 nanoparticles are homogeneously distributed in the carbon matrix. While a low melting point eutectic salt acts as an ionic liquid solvent, ZIF-12, at high temperature, leading cobalt nanoparticles with a trace amount of Co3O4 interconnected by conductive amorphous carbon. In addition, the surface area (89.04 m2/g) and pore architectures of amorphous carbon embedded with Co nanoparticles are created using the molten salt approach. Thanks to this inexpensive and effective method, the optimal composite porous carbon structures were obtained with the strategy using NaCl salt and showed distinct electrochemical performance on electrochemical methodology revealing the analytical profile of Erdatifinib (ERD) as a sensor modifier. The linear response spanned from 0.01 to 7.38 mu M, featuring a limit of detection (LOD) of 3.36 nM and a limit of quantification (LOQ) of 11.2 nM. The developed sensor was examined in terms of selectivity, repeatability, and reproducibility. The fabricated electrode was utilized for the quantification of Erdafitinib in urine samples and pharmaceutical dosage forms. This research provides a fresh outlook on the advancements in electrochemical sensor technology concerning the development and detection of anticancer drugs within the realms of medicine and pharmacology.
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    ZIF-12-derived N-doped Fe/Co/S/@C nanoparticles as high-performance composite anode electrode materials for lithium-ion batteries
    (Elsevier Science Sa, 2022) Bugday, Nesrin; Ates, Mehmet Nurullah; Duygulu, Ozgur; Deng, Wentao; Ji, Xiaobo; Altin, Serdar; Yasar, Sedat
    Different sulfide species of both iron and cobalt metals (FeS2, FeS, CoS, and FeCoS2) are composed together in N-doped porous carbon (NPC) for the synthesis of composite anode materials (labeled as Fe/Co/S@NPC-T hereafter, T = 700, 800, 900) by sulfurization and pyrolysis of Fe/Co-based zeolitic imidazolate framework (ZIF-12). Their structural properties are investigated by XRD, FTIR, SEM, TEM, BET and XPS analysis, and Fe/ Co/S@NPC-T composite materials, heat treated at different temperatures, are used as anode materials in rechargeable lithium-ion batteries. According to XRD results, the heat treatment of the Fe/Co@ZIF-12/S heat treated at 900 ? leads to the formation of the FeCoS2 phase (66 %) along with CoS (33 %) phase impurity. The heat treatment of the Fe/Co@ZIF-12/S heat treated at 800 ? causes the formation of the main phase of FeCoS2 with minor impurity phases of CoS and FeS2. However, pyrolysis of the Fe/Co@ZIF-12/S heat treated at 700 & DEG;C leads to the formation of the FeCoS2, CoS, FeS, and FeS2 phases. Among the samples, the highest BET surface area is 53.4 m2/g for the Fe/Co/S@NPC-90 0 sample. The CV analysis of the battery cell shows anodic and cathodic redox peaks, which belong to the redox reaction of CoS, FeS2, and FeS. The first dis-charge capacities of the cells for Fe/Co/S@NPC-70 0, Fe/Co/S@NPC-80 0 and Fe/Co/S@NPC-90 0 are 395, 963, 574 mA h/g at 300 mA/g, and 229, 835 and 1024 mA h/g at 1000 mA/g, respectively. (c) 2022 Elsevier B.V. All rights reserved.