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    Öğe
    Conversion efficiency calculations for EUV radiation emitted from laser-produced Tin plasmas
    (Tubitak Scientific & Technological Research Council Turkey, 2009) Atalay, Betul; Kenar, Necla; Demir, Arif
    Ni-like and Co-like EUV radiation between 11-17 nm emitted from laser produced tin plasmas was modelled by using the hydrodynamic/atomic physics code EHYBRID. The atomic data were obtained using the Cowan code. The effects of driving laser pulse duration and the laser intensity with different wavelengths were investigated. The maximum conversion efficiency was calculated as 13.4% for a 266 nm Nd: YAG laser with 1x10(13) W/cm(2) pulse intensity and 5 ns pulse duration.
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    Öğe
    Plasma Copolymerization of Thiophene and Pyrrole
    (IEEE-Inst Electrical Electronics Engineers Inc, 2011) Goktas, Hilal; Gunes, Taylan; Atalay, Betul; Er, Ali Oguz; Kaya, İsmet
    The copolymerization of thiophene and pyrrole thin films synthesized by using a double discharge technique which has a fast filamentary discharge formed from the superposition of an ordinary low-pressure dc glow discharge and a high-current pulsed one is presented. Quartz glass substrates were coated at a pressure of 0.8 mbar and 19-kV pulsed and 2-kV dc potentials. The analysis of functional groups by FTIR spectrometry showed that the molecular structure of the copolymerized thin films with the filamentary discharge part almost preserves the conventional polymeric structure.
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    Öğe
    Polyfluorene Thin Films Synthesized by a Novel Plasma Polymerization Method
    (Springer, 2012) Goktas, Hilal; Mansuroglu, Dogan; Atalay, Betul; Bilikmen, Sinan; Kaya, İsmet
    The synthesis of polyfluorene (PF) thin films by simultaneously superposing a continuous and pulsed discharge and the characterizations of these samples are presented. The double discharge plasma system is constructed by superposing two discharges; namely, a low pressure dc glow one and a high current pulsed one. The fluorene monomer in powder form was vaporized in the system at argon plasma without any modification, at 0.5 mbar operating pressure. The structure of the thin films was investigated via XPS, UV-visible, FTIR, XRD and SEM. The FTIR and the UV-visible results revealed that the fluorene structure was retained at the produced samples. Semi-conducting behavior was established, and upon the iodine doping, the optical energy band gap (E-g) dropped down from 3.7 to 2.4 eV. The morphology of the synthesized PF thin films was amorphous, with granular structures of different sizes depending on the location of the substrate.