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      저자 : Gokhan Sen (검색결과 3 건)
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      • KCI등재

        The electrical conductivity properties of polythiophene/TiO2 nanocomposites prepared in the presence of surfactants

        Aysegul Uygun,Orhan Turkoglu,Songul Sen,Ersay Ersoy,Ayse Gul Yavuz,Gokhan Guven Batir 한국물리학회 2009 Current Applied Physics Vol.9 No.4

        A composite of polythiophene (PT) and nano-titanium dioxide (TiO2), possessing core–shell structure, was synthesized via oxidative polymerization of thiophene using FeCl3 in the presence of three different surfactants: anionic, cationic, and nonionic. The morphology of the obtained composite materials was investigated by SEM, proving the core–shell structure of the prepared nanocomposite. The formation and thermal stability of the PT onto TiO2 nanoparticles were confirmed by FTIR and TGA analyses, respectively. XRD data show all of composite materials were amorphous structures. The electrical properties of the nanocomposites were investigated in the presence of surfactant materials, and the best semiconductor property was observed for PT/TiO2-anionic system. This difference in the conductivity has been attributed to differences in the stability of the composites. A composite of polythiophene (PT) and nano-titanium dioxide (TiO2), possessing core–shell structure, was synthesized via oxidative polymerization of thiophene using FeCl3 in the presence of three different surfactants: anionic, cationic, and nonionic. The morphology of the obtained composite materials was investigated by SEM, proving the core–shell structure of the prepared nanocomposite. The formation and thermal stability of the PT onto TiO2 nanoparticles were confirmed by FTIR and TGA analyses, respectively. XRD data show all of composite materials were amorphous structures. The electrical properties of the nanocomposites were investigated in the presence of surfactant materials, and the best semiconductor property was observed for PT/TiO2-anionic system. This difference in the conductivity has been attributed to differences in the stability of the composites.

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        Isolated Boost Converter with Bidirectional Operation for Supercapacitor Applications

        Hernandez, Juan C.,Mira, Maria C.,Sen, Gokhan,Thomsen, Ole C.,Andersen, Michael A.E. The Korean Institute of Power Electronics 2013 JOURNAL OF POWER ELECTRONICS Vol.13 No.4

        This paper presents an isolated bidirectional dc/dc converter based on primary parallel isolated boost converter (PPIBC). This topology is an efficient solution in low voltage high power applications due to its ability to handle high currents in the low voltage side. In this paper, the converter has been modeled using non-ideal components and operated without any additional circuitry for startup using a digital soft-start procedure. Simulated and measured loop gains have been compared for the validity of the model. On-the-fly current direction change has been achieved with a prototype interconnecting two battery banks. A second prototype has been constructed and tested for supercapacitor operation in constant power charge mode.

      • KCI등재

        Isolated Boost Converter with Bidirectional Operation for Supercapacitor Applications

        Juan C. Hernandez,Maria C. Mira,Gokhan Sen,Ole C. Thomsen,Michael A. E. Andersen 전력전자학회 2013 JOURNAL OF POWER ELECTRONICS Vol.13 No.4

        This paper presents an isolated bidirectional dc/dc converter based on primary parallel isolated boost converter (PPIBC). This topology is an efficient solution in low voltage high power applications due to its ability to handle high currents in the low voltage side. In this paper, the converter has been modeled using non-ideal components and operated without any additional circuitry for startup using a digital soft-start procedure. Simulated and measured loop gains have been compared for the validity of the model. On-the-fly current direction change has been achieved with a prototype interconnecting two battery banks. A second prototype has been constructed and tested for supercapacitor operation in constant power charge mode.

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