Browsing by Author "Gur, M."

Now showing 1 - 4 of 4

Investigation of photodetector and photovoltaic properties of H2Pc/CuO and H2Pc/ITO junctions produced with modified H2Pc
(Springer Nature, 2024) Unal, F.; Aktas, S.; Kurt, M.S.; Koc, M.M.; Arslan, T.; Coskun, B.; Gur, M.
In this work, it was aimed to provide an alternative to organic-based photodiode detectors (OPDs), solar cell with the modified H2Pc organic thin film heterojunctions. For this purpose, the modified H2Pc organic thin film was grown on ITO/glass and CuOx/ITO/glass substrates via thermal evaporation method and their optoelectronic properties were compared with each other and other organic-based devices. The crucial optical parameters of the fabricated heterojunctions were determined in the wavelengths range of 300–800 nm. In order to perform electrical characterisation, Ag metal contacts were grown on the heterojunctions and Ag/H2Pc/ITO/Ag and Ag/H2Pc/CuOx/Ag devices were fabricated. Diode, photovoltaic and photodetector parameters of the fabricated devices were investigated in the applied potential of ± 3 V under dark and several light intensities. Ultimately, it can be stated that the fabricated devices may offer an alternative to OPDs and organic-based solar cell.Please check and confirm the author names and initials are correct. Also, kindly confirm the details in the metadata are correct.I confirm that the author names are correct Graphical abstract: (Figure presented.).
Photodetector performance analysis of a hybrid MnPc/DLC device with high photoresponsivity, sensitivity, and On/Off ratio
(2024.01.01) Unal, F.; Aktas, S.; Kurt, M.S.; Koc, M.M.; Coskun, B.; Aslan, N.; Arslan, T.; Gur, M.
The fabrication and characterization of high-performance devices for optoelectronic applications, particularly their response to incident light, are crucial. In this study, a MnPc/DLC device was fabricated using thermal evaporation and magnetron sputtering techniques, and its fundamental optoelectronic properties were characterised. Key diode parameters including barrier height, ideality factor, reverse saturation current, series resistance, and shunt resistance were determined using several methods, such as TE, Ohm's Law, the modified Norde method, and the Mikhelashvili method. The results from these methods were found to be consistent with varying light intensities. Additionally, photodetector parameters of the MnPc/DLC device were measured at +/- 1 V under light intensities of 20, 40, 60, 80, and 100 mW/cm(2), and the findings were compared with the literature. The maximum values for photocurrent, photoresponsivity, photosensitivity, specific detectivity, and on/off ratio were 6.41 x 10(-2) A, 2.49 A/W, 2.02 x 10(5), 5.8 x 10(9) Jones and 2.06 x 10(3), respectively. Notably, the photocurrent, photoresponsivity, photosensitivity, and on/off ratio values were found to be significantly higher and more promising compared to those reported in the literature.
Polymeric Adsorbent for the Effective Removal of Toxic Dyes from Aqueous Solutions: Equilibrium, Kinetic, and Thermodynamic Modeling
(John Wiley and Sons Inc, 2024) Oter, C.; Gokkus, K.; Gur, M.; Butun, V.
This study investigates the adsorption behavior of anionic (Congo red, Eosin yellow) and cationic (Malachite green) dyes on synthesized TD polymer particles, highlighting the material's potential as an effective adsorbent for industrial wastewater treatment. Key operational parameters, including initial solution's pH, contact time, initial dye concentration, and temperature, were systematically evaluated to determine their influence on adsorption efficiency. The experimental data demonstrated that the Langmuir isotherm provided the best fit for all three dyes, indicating monolayer adsorption with maximum adsorption capacities of 153.8 mg/g for Malachite green, 49.36 mg/g for Congo red, and 227.9 mg/g for Eosin yellow. Kinetic analysis revealed that the adsorption of Malachite green and Congo red followed pseudo-second-order kinetics, while Eosin yellow adsorption was better described by the intra-particle diffusion model. Thermodynamic assessments, including Gibbs free energy (ΔG°), enthalpy (ΔH°), and entropy (ΔS°), confirmed the spontaneous and endothermic nature of the adsorption processes for Malachite green and Eosin yellow, contrasting with the exothermic behavior observed for Congo red. These findings underscore the versatility and effectiveness of TD polymer particles in removing both anionic and cationic dyes from aqueous solutions. Further research could explore material optimization and real-world applications to broaden their utility in sustainable water treatment strategies.
Preparation of versatile polymer particles and their application for elimination of bromophenol blue and phenol from aqueous environment
(Elsevier B.V., 2024) Gokkus, K.; Oter, C.; Amlani, M.; Gur, M.; Butun, V.
Cellulose, activated carbon, zeolite, and similar materials have a weak effect against anionic pollutants. Therefore, further modifications are needed for the use of such substances. In this study, polymer particles (GD) that were economical and directly effective against anionic pollutants were synthesized as an alternative. GD particles were synthesized with glutaraldehyde and diethylenetriamine as monomers for the first time. The polymer particles were characterized in detail. Then, GD particles were used in the adsorption of anionic Bromophenol blue (BPB) and phenol (PH). As a result, it was determined that i) the adsorption process between GD particles, Bromophenol blue and phenol was chemisorption, ii) the adsorption of BPB and PH on to GD particles obeyed the Langmuir isotherm and pseudo second order kinetic model. pH, temperature, initial dye concentration, adsorbent dosage, and contact time were determined orderly 4, 50 °C, 300 mg L−1, 10 mg, and 180 mins for BPB and 5, 50 °C, 10 mg L−1, 15 mg, and 30 mins for PH. The maximum adsorption capacities of GD polymer particles for BPB and PH were ascertained as 136.40 mg g−1 and 98.26 mg g−1, respectively. As a result, it was produced economical, simple, feasible, and functional adsorbents against anionic pollutants.