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Öğe Fabrication of Cu2ZnSnS4 (CZTS) nanofibers via electrospinning(AMER CHEMICAL SOC, 2014) Buyukbekar, Burak Zafer; Ozel, Faruk; Sakalak, Huseyin; Kus, Mahmut; Yavuz, Mustafa Selman[Abstract not Available]Öğe Gold nanoparticles immobilized on electrospun titanium dioxide nanofibers for catalytic reduction of 4-nitrophenol(WILEY-V C H VERLAG GMBH, 2017) Cavusoglu, Halit; Buyukbekar, Burak Zafer; Sakalak, Huseyin; Kohsakowski, SebastianThis study involves the preparation and catalytic properties of anatase titanium dioxide nanofibers (TiO2 NFs) supported gold nanoparticles (Au NPs) using a model reaction based on the reduction of 4-nitrophenol (NP) into 4-aminophenol (AP) by sodium borohydride (NaBH4). The fabrication of surfactant-free Au NPs was performed using pulsed laser ablation in liquid (PLAL) technique. The TiO2 NFs were fabricated by a combination of electrospinning and calcination process using a solution containing poly(vinyl pyrolidone)(PVP) and titanium isopropoxide. The adsorption efficiency of laser-generated surfactant-free Au NPs to TiO2 NF supports as a function of pH was analyzed. Our results show that the electrostatic interaction mainly controls the adsorption of the nanoparticles. Au NPs/TiO2 NFs composite exhibited good catalytic activity for the reduction of 4-NP to 4-AP. The unique combination of these materials leads to the development of highly efficient catalysts. Our heterostructured nanocatalysts possibly form an efficient path to fabricate various metal NP/metal-oxide supported catalysts. Thus the applications of PLAL-noble metal NPs can widely broaden.Öğe Measuring temperature change on photothermal Au nanorod and nanocage upon laser irradiation(AMER CHEMICAL SOC, 2015) Cavusoglu, Halit; Sakalak, Huseyin; Buyukbekar, Burak Zafer; Demirel, Gokhan; Citir, Murat; Yavuz, Mustafa Selman[Abstract not Available]Öğe New method for measuring the temperature change of photothermal Au nanostructures using smart polymers(AMER CHEMICAL SOC, 2015) Cavusoglu, Halit; Sakalak, Huseyin; Buyukbekar, Burak Zafer; Demirel, Gokhan; Citir, Murat; Yavuz, Mustafa Selman[Abstract not Available]Öğe Production of CuAlO2 in powder, bulk and nanofiber forms(KOREAN ASSOC CRYSTAL GROWTH, INC, 2015) Kaya, Ismail Cihan; Cetin, Cagla; Aydin, Hursit Safa; Katircioglu, Zeynep; Buyukbekar, Burak Zafer; Yavuz, Mustafa Selman; Uyaner, MesutA study was carried out on the production of CuAlO2 by using 3 different production routes namely, hydrothermal synthesis, conventional solid state reaction and electrospinning process. For hydrothermal synthesis, commercially available metal salts, Cu2O powder and chemically precipitated CuO nanoparticles were used as precursors. Bulk CuAlO2 samples were prepared via solid state reaction route by ball milling and high temperature sintering of CuO and Al2O3 powders. CuAlO2 ceramic mats were synthesized by electrospinning process with the assistance of polyvinylpyrolidone, as a template polymer. Highly crystalline mesh structured fibers were obtained after sintering of polymer/equal moles of copper chloride and aluminum nitrate composite in air. In the current work, solid state reaction and electrospinning processes yielded phase pure CuAlO2 in hexagonal symmetry. On the other hand, products obtained from hydrothermal synthesis were CuO, Cu2O and Al(OOH), which did not yield CuAlO2 under current experimental conditions. Detailed qualitative X-ray diffraction analysis revealed the need of specific ionic species in the solution within a narrow temperature-composition-pH window to obtain phase pure CuAlO2 employing hydrothermal conditions.Öğe Smart polymer functionalized graphene nano-devices for thermo-switch controlled biodetection(TAYLOR & FRANCIS INC, 2015) Balcioglu, Mustafa; Buyukbekar, Burak Zafer; Yavuz, Mustafa Selman; Yigit, Mehmet V.[Abstract not Available]Öğe Smart-Polymer-Functionalized Graphene Nanodevices for Thermo-Switch-Controlled Biodetection(AMER CHEMICAL SOC, 2015) Balcioglu, Mustafa; Buyukbekar, Burak Zafer; Yavuz, Mustafa Selman; Yigit, Mehmet V.In this work, we have developed a general methodology for constructing an activatable biosensor utilizing a thermoresponsive polymer and two-dimensional nanosheet. We have demonstrated the detection of four different types of biological compounds using the smart PEGMA (poly(ethylene glycol) methyl ether methacrylate), oligonucleotides, and graphene oxide nanoassembly. The activity of the functional nanodevice is controlled with a thermo-switch at 39 degrees C. In this design, the nanosized graphene oxide serves as a template for fluorophore labeled probe oligonucleotides while quenching the fluorescence intensities dramatically. On the other hand, the PEGMA polymer serves as an activatable protecting layer covering the graphene oxide and entrapping the probe oligonucleotides on the surface. The PEGMA polymers are hydrophobic above their lower critical solution temperature (LCST) and therefore interact strongly with the hydrophobic surface of graphene oxide, creating a closed configuration (OFF state) of the nanodevice. However, once the temperature decreases below the LCST, the polymer undergoes conformational change and becomes hydrophilic. This opens up the surface of the graphene oxide (open configuration, ON state), freeing the encapsulated payload on the surface. We have tuned the activity of the nanodevice for the detection of a sequence-specific DNA, miR-10b, thrombin, and adenosine. The activity of our functional system can be decreased by 80% with a thermo-switch at 39 C. Our approach can be extended to other antisense oligonucleotide, aptamer, or DNAzyme based sensing strategies.Öğe Stimulus-responsive water-soluble graphene nanodevices for tunable biomarker detection(AMER CHEMICAL SOC, 2015) Balcioglu, Mustafa; Buyukbekar, Burak Zafer; Yavuz, Mustafa; Yigit, Mehmet[Abstract not Available]Öğe Synthesis and characterization of thiol-ene based nanoporous covalent organic polymers for CO2 capture(AMER CHEMICAL SOC, 2016) Buyukbekar, Burak Zafer; Cavusoglu, Halit; Goren, Ekrem; Yavuz, Mustafa Selman[Abstract not Available]
