Browsing by Author "Arslan, A."
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Item Open Access Aromatik asit içeren bazı kristallerin molekül yapılarının X-ışınları kırınımı yöntemiyle incelenmesi ve kuantum mekaniksel hesaplamaları(Türkiye Kimya Derneği, 2015) Aslantaş, M.; Karayel, Arzu; Çelik, Ö.; Arslan, A.Aromatic-structured acids and their complexes are having with biological importance, in particular molecules which are used in the food industry due to enzymatic activity and antimicrobial properties. In this study, crystal structure analyses were performed by X-ray diffraction method, and biological analysis of synthesized aromatic-structured complex molecules determined. In order to support and compare of the experimental results for these complexes, the quantum mechanical Hartree-Fock (HF) and Density Functional Theory (DFT) methods were investigated by theoretical calculations. Many information at the atomic level for the complex molecules such as, conformations in the unit cell, energies, bond lengths and angles, molecular packing, intra- and inter-molecular hydrogen bonding interactions were presented.Item Open Access Nanowire-shaped MoS2@MoO3 nanocomposites as a hole injection layer for quantum dot light-emitting diodes(American Chemical Society, 2022-08-23) Bastami, N.; Soheyli, E.; Arslan, A.; Sahrae, R.; Yazici, A. F.; Mutlugun, EvrenMolybdenum disulfides and molybdenum trioxides are structures that possess the potential to work as efficient charge transport layers in optoelectronic devices. In the present study, as opposed to the existing Mo-based nanostructures in flake, sheet, or spherical forms, an extremely simple and low-cost hydrothermal method is used to prepare nanowires (NWs) of MoS2@MoO3 (MSO) composites. The synthesis method includes several advantages including easy handling and processing of inexpensive precursors to reach stable MSO NWs without the need for an oxygen-free medium, which would facilitate the possibility of mass production of these nanostructures. The structural analysis confirmed the formation of MSO nanocomposites with different Mo valence states, as well as NWs of average length and diameter of 70 nm and 5 nm, respectively. In order to demonstrate their potential for optoelectronic applications, MSO NWs were blended into hole injection layers (HILs) in quantum dot-based light-emitting diodes (QLEDs). Electroluminescence measurements show a substantial enhancement in both luminance (from 44,330 to 68,630 cd.m–2) and external quantum efficiency (from 1.6 to 2.3%), based on the increase in the ratio of MSO NWs from 3 to 10%. Interestingly, the addition of 10% volume of MSO NWs resulted in a remarkably smoother HIL with improved current efficiency and stability in green-emitting QLEDs. The simplicity and cost-effective features of the synthesis method along with outstanding favorable morphology demonstrated their ability to enhance the QLED performance and mark them as promising agents for optoelectronics.Item Open Access Sweeping with all graphical ingredients in a topological picturebook(Elsevier, 1992) Akman, V.; Arslan, A.Sweeping is a powerful method to generate 3-D shapes in geometric modeling. In this paper we formulate a general matrix to give a mathematical definition of twisted-profiled sweep objects as a discrete approximation. While conceptually simple, our result is, to our best knowledge, the first precise formulation of sweeping with all graphical ingredients, viz. twisting, scaling, rotation, and translation. Twisted-profiled sweeping surfaces defined by contour, profile, trajectory, and guide curves are thus represented in concatenated matrix formulation. In addition, we give interactive methods to generate sweep objects and present sample figures produced within the framework of our implementation Tb, a topological picturebook.