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  • Küçük Resim Yok
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    Dielectric characterization of BSA doped-PANI interlayered metal-semiconductor structures
    (Springer, 2019) Karaoglan, Nursel; Tecimer, Habibe Uslu; Altindal, Semsettin; Bindal, Cuma
    The measured capacitance and conductance-voltage (C & G/omega-V) data between 1 and 200 kHz of Al/(BSA-doped-PANI)/p-InP structure were examined to uncover real and imaginary components of complex permittivity (epsilon* = epsilon ' - j epsilon ''), loss tangent (tan delta), complex electric modulus (M* = M ' + jM ''), and electrical conductivity (sigma). It was uncovered that dielectric constant (epsilon '), dielectric loss (epsilon ''), tan delta, real and imaginary components (M ' and M '') show a big dispersive behavior at low frequencies due to the oriental and the interfacial polarizations, as well as the surface states (N-ss) and the BSA doped-PANI interlayer. Such behavior in epsilon ', epsilon '', and tan delta, behavior with frequency was also explained by Maxwell-Wagner relaxation. The values of sigma are almost constant at lower-intermediate frequencies, but they start increase at high frequencies which are corresponding to the dc and ac conductivity, respectively. The values of M ' and M '' are lower in the low frequency zone and they become increase with increasing frequency at accumulation region due to the short-range charge carriers mobility. Ultimately, dielectric parameters and electric modulus alteration with frequency is the consequence of surface states and relaxation phenomena.
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    Structural, spectroscopic, Hirshfeld surface and DFT approach of 3,9-dibromophenanthrene
    (Acg Publications, 2022) Cakmak, Osman; Ersanli, C. Cuneyt; Akar, Kiymet Berkil; Karaoglan, Nursel
    Bromination of 9-bromophenanthrene with one equivalent of bromine resulted in formation of dibromophenantrene isomers. Only 3,9-dibromophenanthrene (2) has been isolated from the mixture and characterized by NMR and X-ray diffraction techniques. Solid state crystal structure of dibromide 2 have been established by X-ray diffraction technique. The Hirshfeld and 2D fingerprint analyses were used to investigate the intermolecular interactions in the crystal structure. The molecular geometries have also been optimized by using density functional theory (DFT-B3LYP) methods with the 6-311G (d,p) basis set and geometric parameters have been compared with the experimental data. Additionally, molecular electrostatic potential (MEP), chemical activity parameters, Fukui function (FF) analysis of compound (2) have been investigated.