Yazar "Mansuroğlu, Doğan" seçeneğine göre listele

Listeleniyor 1 - 2 / 2
  • Küçük Resim
    Öğe
    Polyfluorene Thin Films Synthesized by a Novel Plasma Polymerization Method
    (Springer, 2012) Göktaş, Hilal; Mansuroğlu, Doğan; Atalay, Betül; 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.
  • [ X ]
    Öğe
    RAMAN SPECTROSCOPY AND PHOTOLUMINESCENCE CHARACTERIZATION OF THE IODINE DOPED PLASMAPOLYMERIZED BIPHENYL THIN FILM
    (2018) Mansuroğlu, Doğan
    The iodine doped plasma-polymerized biphenyl thin film is investigated inthis study. Iodine atoms lead to increase the charge transfer complexes and change theelectronic equilibrium in the polymer structure due to their high electronegativity. Therefore,the iodine doped films show significant improvements in the electrical characteristics ascompared to the undoped ones. The results of Raman spectroscopy verify the presence of theiodined groups in the structure of deposited thin films. The number density of the iodinedgroups increases with increasing the radio frequency input power. The ID/IG ratio changes ina range from 0.40 to 0.72 for the undoped thin films while it decreases from 0.74 to 0.58 forthe iodine doped thin films which can be due to the rearrangement in the structure.Photoluminescence spectra show a broad red emission band at about 630 nm as well asunclear bands placed like small shoulders at 580 nm and 731 nm. These bands become toseem clearly after the iodine doping process. The conjugation length of the polymer thin filmsincreases with iodine doping as well as increasing the power values. All depositions areproduced using a capacitively coupled plasma system with 13.56 MHz radio frequencysource. During the doping process, the vaporized iodine material is directly exposed to theplasma discharge and mixed with the biphenyl polymer material. All results are characterizedin detail.