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RISS 인기검색어
- 검색키워드
- 저자 : Aysegul Uygun (검색결과 2 건)
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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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Characteristics of nanocomposite films deposited by atmospheric pressure uniform RF glow plasma
Aysegul Uygun,Lutfi Oksuz,Ayse Gul Yavuz,Ali Guleç,Songul Sen 한국물리학회 2011 Current Applied Physics Vol.11 No.2
Characteristics of nanocomposite films synthesized and deposited by atmospheric pressure Radio-Frequency (RF) (13.56 MHz) uniform glow discharge are examined. The nanocomposite thin film deposition is carried out in the presence of titanium dioxide (TiO_2) with polymerization of pyrrole,thiophene and furan monomers in acetonitrile medium containing lithium perchlorate (LiClO_4). The chemical, morphological, thermal and electrical characteristics of polypyrrole/TiO_2 (PPy/TiO_2), polythiophene/TiO_2 (PT/TiO_2) and polyfuran/TiO_2 (PF/TiO_2) composites are examined by FTIR spectroscopy,scanning electron microscopy-energy dispersive X-ray analysis (SEM-EDX), atomic force microscopy (AFM), thermogravimetry (TGA) and four-probe conductivity measurements. The presence of PT bands in the FTIR spectra of PT/TiO_2 indicates that plasma polymerization did not cause thiophene ring opening as was reported in the literature. The thermograms indicate that the PPy/TiO_2 composite has the best thermal stability, whereas PT/TiO_2 has the best electrical conductivity. Morphology studies reveal that the composite film deposition occurs uniformly through polymerization of the monomer onto TiO_2nanoparticles.
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