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- MakaleYalnız künye2014Scopus SJRQ3Electrical and Optical Properties of Titanium Dioxide-Carbon Nanotube Nanocomposites
Aydin, Handan
The electrical and optical properties of carbon nanotube and titanium dioxide nano-composites have been investigated. The carbon nanotubes were prepared by chemical vapor deposition. The diameters and lengths of the carbon nanotubes were respectively determined to be 20-30 nm and about 3-5 mu m by high resolution transmittance electron microscopy. The direct current electrical conductivity values sigma(dc) of the nanocomposites were found to be in the range of 5.96 x 10(-3)-0.47 S/cm. It was found that the electrical conductivity of nanocomposites increases with CNT content. The optical band gaps of the nanocomposites were determined by Kubelka-Munk theory based on the analysis of diffuse reflectance spectra. The band gap (E-g) values of the composites were decreased with increasing CNT contents. The obtained results indicate that the electrical and optical properties of TiO2 semiconductor metal oxide can be improved by incorporation of CNT content for electronic applications.
AtıfWoS6OpenAlex11
İncele - MakaleAçık Erişim2011Scopus SJRQ2Synthesis and Characterization of Novel Mn(II), Co(III), Ni(II) and Cd(II) Complexes from 4-(2-nitrophenylazo)-1H-pyrazole-3,5-diamine
Esener, Hasan; Adiguzel, Ragip; Ergin, Zuhal; Aktan, Ebru; Turan, Nevin; Sekerci, Memet
In this study, the diazotized o-nitroaniline was coupled with malononitrile. The ring closure reaction of the obtained product with hydrazine monohydrate yielded 4-(2-nitrophenylazo)-1H-pyrazole-3,5-diamine (L). The structure of L has been elucidated by spectroscopic analyses. Then, novel Mn(II), Co(II), Ni(II) and Cd(II) complexes of L have been synthesized, and the structures of these complexes determined by elemental analysis, spectrometric and TGA/DTA methods, molar conductance and magnetic susceptibility measurements. All complexes were monomeric. Except Mn(II) complex, other complexes were diamagnetic. From the elemental analyses and mass spectra data, the complexes were proposed to the formulas [MnL2(CH3O)H2O]center dot Cl center dot CH3OH, [CoL2(CH3O)(2)]center dot Cl center dot 2.5CH(3)OH, [NiL2(CH3OH)(2)]center dot 6.5CH(3)OH and [Cd2L2(Cl)(2)(CH3O)(2)]center dot CH3OH center dot 1.5H(2)O. For Mn(II) and Co(III) complexes octahedral and for the Ni(II) complex square planar geometry were proposed, but the Cd(II) complex includes five coordinated structure. The Mn(II), Co(II) and Ni(II) complexes were found to be mononuclear and electrolytes. On the other hand Cd(II) complex was found to be dinuclear and non-electrolyte.
AtıfWoS12OpenAlex9İncele - DergiJOURNAL OF NANOELECTRONICS AND OPTOELECTRONICS
- DergiADVANCED SCIENCE LETTERS