Yazar "Oncan, Mehmet" seçeneğine göre listele

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    Crystallographic, structural, optical, and dielectric properties of aniline and aniline halide imprinted hydrogels for optoelectronic applications
    (Springer, 2023) Yalcin, Orhan; Coskun, Ramazan; Okutan, Mustafa; Oncan, Mehmet; Yesilot, Gursel
    This study examines the availability of aniline and aniline halide imprinted hydrogels for technological applications through crystallographic, structural, optical, and dielectric studies. Their optical band gap and ultraviolet-visible (UV-Vis) absorption spectra have been performed in the wavelength range of 190-900 nm. The dielectric properties, energy loss tangent/ dissipation factor (tand), and complex electric modulus were characterized at room temperature and a frequency range of 100 Hz to 100 MHz. The results suggest that the complex dielectric constant and modulus are related to Kroop's theory, Brownian motion in viscoelastic systems, and Maxwell-Wagner theory. Conductivity parameters and negative s-parameter values were obtained, providing insight into the conductivity mechanism of the samples. The Cole-Davidson plots of the complex dielectric constant and the Cole-Davidson plots adapted to Smith Chart diagrams were obtained to observe the sufficiency of the samples in electronic circuit applications. Overall, the study provides a detailed analysis of the dielectric, morphological, and optical properties of aniline and aniline halide imprinted hydrogels, demonstrating their potential for technological applications.
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    Equivalent device and optical band gaps analysis of acidic red dye imprinted hydrogels
    (Springer, 2022) Coskun, Ramazan; Okutan, Mustafa; Yalcin, Orhan; Ozturk, Muhittin; Kirsoy, Ahmet; Oncan, Mehmet
    Structural, optical and dielectric properties of high quality hydrogels with different doses acidic red dye imprinted were successfully analyzed in detail in this work into provide important information about the technological applications. Absorbance spectra and their energy band gaps for the acidic red dye imprinted hydrogels have been analyzed with UV spectroscopy. The complex dielectric constant, the tangent/dissipation factor (tan delta), the complex impedance, the capacitance and the complex electric modulus were measured in the frequency range of 100 Hz to 40 MHz at room temperature. It has been determined that the peak values of the tangent value in the AR doped samples in the high frequency region are due to the anionic dye effect, unlike the cationic dye doped samples. The dominant effects such as the complex dielectric constant and electric modulus in high frequency region for acidic red dye imprinted hydrogels have been attributed to the Maxwell-Wagner theory, the basis of Kroop's approach and the ionic conductivity. Experimental plane plots (Cole-Cole plots) of the complex dielectric constant, impedance and electric modulus for different doses acidic red dye imprinted hydrogels were obtained. In order to analyze the suitability of the samples for electrical circuit applications, the equivalent electrical circuit corresponding to the Cole-Cole plots for the complex electric modulus was calculated and adapted with Smith Chart.