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    Effect of CuO doping on the performance of LaB6 interlayer films in Al/CuO:LaB6/p-Si/Al diodes
    (Elsevier, 2023) Ocaya, Richard O.; Al-Sehemi, Abdullah G.; Tataroglu, Adem; Dere, Aysegul; Erol, Ibrahim; Aksu, Mecit; Al-Ghamdi, Ahmed A.
    This study investigates the fabrication and performance analysis of Al/CuO:LaB6/p-Si/Al diodes with CuO-doped LaB6 interlayer films of varying concentrations (1%, 5%, and 10%). Experimental evidence demonstrates the limitations of 0% CuO doping, as pure LaB6 lacks a significant barrier height, resulting in ohmic behavior unsuitable for intended applications. Through comprehensive analyses under varying illuminations (20-100 mW/cm2) and frequencies (10 kHz-1 MHz), the study reveals that controlling CuO doping in LaB6 significantly enhances the effective barrier height at the LaB6:CuO heterojunction, improving rectification properties. This enhancement enables the diode to be well-suited for high-speed photonic devices utilizing one-step photoemission. The findings contribute to the development of high-performance LaB6-based devices, advancing photonic technologies by emphasizing the advantages of CuO doping.
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    Fabrication of photodiodes based on graphene oxide (GO) doped lanthanum hexaboride (LaB6) nanocomposites
    (Elsevier Science Sa, 2024) Yalcin, Mesut; Al-Sehemi, Abdullah G.; Erol, Ibrahim; Aksu, Mecit; Tillayev, Sanjar; Dere, Aysegul; Al-Ghamdi, Ahmed A.
    GO-doped LaB6 nanocomposite-based Al/p-Si/GO:LaB6/Al photodiodes were fabricated for the study. The electrical properties of the fabricated photodiodes were subjected to current-voltage and capacitance-voltage measurements. The ideality factors, barrier heights and series resistance values of photodiodes were calculated and compared using the Cheung-Cheung and Norde methods approaches. The lowest ideality factor values were calculated to be 4.75, 4.00 and 9.21 in the samples doped with GO at 1 %, 5 % and 10 %, respectively, and the highest barrier height values were calculated from the Norde function to be 0.75, 0.64 and 0.75 eV, respectively Additionally, the responsivity (R) and detectivity (D) values of the diodes were calculated. The R values of 1 %, 3 % and % 5 doped diodes were calculated as 2153, 6001 and 2042 mA/W at, 100 mW/cm(2), respectively. The D* values of 1 %, 3 % and % 5 doped diodes are calculated as 1.38 x 10(11), 3.85 x 10(11) and 1.31 x 10(11) Jones at 100 mW/cm(2), respectively. The interface state (Nss) of 1 %, 3 % and % 5 doped diodes were calculated as 2 x 10(13), 1.25 x 10(13) and 1.06 x 10(13)eV(-1) cm(-2), at 100 mW/cm(2), respectively. It can be concluded that the diodes produced in this study have potential for use in optoelectronic applications.
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    Novel bionanocomposites of chitosan-based blend containing LaB6: Thermal, dielectric, and biological properties
    (Wiley, 2023) Erol, Ibrahim; Hazman, Omer; Aksu, Mecit; Uygur, Ilyas
    In the presented study, a strategy that will offer alternative usage areas by strengthening the physicochemical properties of the green polymer chitosan (CS) is aimed. For this purpose, a compatible blend of CS (CS-PFPAMA) with poly 2-(4-fluorophenyl)-2-oxoethyl-2-methylprop-2-enoate (PFPAMA), a methacrylate-based synthetic polymer, was prepared by hydrothermal method. Miscibility and compatibility of the CS-PFPAMA blend were confirmed by the single glass transition temperature (T-g) determined by differential scanning calorimetry (DSC). Then, lanthanum hexaboride (LaB6) nanoparticles (NPs) prepared by the chemical method were successfully added to the CS-PFPAMA blend at different weight ratios by hydrothermal method. Morphological characterizations of CS-PFPAMA blend and produced nanocomposites were performed with Fourier transform infrared spectroscopy, X-ray diffraction, scanning electron microscope, energy-dispersive X-ray spectroscopy, and atomic force microscopy, and thermal characterizations were made with thermogravimetric analysis and DSC. The thermal stability and T-g values of the obtained CS-PFPAMA blend and nanocomposites were lower than the values of the CS. However, LaB6 NPs increased the dielectric properties of the CS-PFPAMA blend. Thus, the potential use of the produced nanocomposites in electronic devices may be in question. According to the results of antibiogram tests performed by the disk diffusion method, it was determined that nanocomposites showed a serious resistance against Escherichia coli and Staphylococcus aureus pathogens. In addition, both antioxidant and oxidant properties of nanocomposites showed values close to the reference material used. The determined biological properties indicate that the CS-based nanocomposites can be used as biomaterials.
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    Synthesis of novel PVA-PFPAMA nanocomposites by the hydrothermal method: Evaluation of thermal, antimicrobial, and anticarcinogenic properties
    (Elsevier Science Sa, 2023) Erol, Ibrahim; Hazman, Omer; Ozkan, Mehmet; Uygur, Ilyas; Khamidov, Gofur; Gerengi, Husnu
    In this study, a mixture of poly 2-(4-fluorophenyl)-2-oxoethyl-2-methylprop-2-enoate (PFPAMA) and PVA was first prepared and characterized using the hydrothermal method. Copper (II) oxide nanoparticles (CuO NPs) prepared by solution plasma process (SPP) were hydrothermally incorporated into the PVA-PFPAMA blend at 3 %, 5 %, and 7 %. FTIR spectroscopy was used to identify the functional groups of the obtained materials. Morphological and structural analysis of the materials was investigated by scanning electron microscopy (SEM), X-ray diffraction (XRD), and atomic force microscopy (AFM). The glass transition temperatures (Tg) of the materials were investigated by differential scanning calorimetry (DSC), and their thermal stability by thermogravimetric analysis (TGA). All materials showed excellent antimicrobial effects against E. coli, S. aureus, and C. albicans strains. It was also found that the anticarcinogenic activity increased with the proportion of CuO NPs in the nanocomposites. The results showed that the thermal and biological properties of the nanocomposites were positively affected after the inclusion of CuO NPs in the PVA-PFPAMA blend. The synergistic effects of PFPAMA and CuO NPs improved the overall performance of the materials.