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Your search keyword '"Musa Mutlu Can"' showing total 7 results
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7 results on '"Musa Mutlu Can"'

1. Crystal orientation of epitaxial film deposited on silicon surface

Author

Satoru Kaneko, Takashi Tokumasu, Manabu Yasui, Masahito Kurouchi, Daishi Shiojiri, Shigeo Yasuhara, Sumanta Kumar Sahoo, Musa Mutlu Can, Ruei Sung Yu, Kripasindhu Sardar, Masahiro Yoshimura, Masaki Azuma, Akifumi Matsuda, and Mamoru Yoshimoto

Subjects
Medicine, Science
Abstract

Abstract Direct growth of oxide film on silicon is usually prevented by extensive diffusion or chemical reaction between silicon (Si) and oxide materials. Thermodynamic stability of binary oxides is comprehensively investigated on Si substrates and shows possibility of chemical reaction of oxide materials on Si surface. However, the thermodynamic stability does not include any crystallographic factors, which is required for epitaxial growth. Adsorption energy evaluated by total energy estimated with the density functional theory predicted the orientation of epitaxial film growth on Si surface. For lower computing cost, the adsorption energy was estimated without any structural optimization (simple total of energy method). Although the adsorption energies were different on simple ToE method, the crystal orientation of epitaxial growth showed the same direction with/without the structural optimization. The results were agreed with previous simulations including structural optimization. Magnesium oxide (MgO), as example of epitaxial film, was experimentally deposited on Si substrates and compared with the results from the adsorption evaluation. X-ray diffraction showed cubic on cubic growth [MgO(100)//Si(100) and MgO(001)//Si(001)] which agreed with the results of the adsorption energy.

Published
2024
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6. Effect of Ti Atoms on Néel Relaxation Mechanism at Magnetic Heating Performance of Iron Oxide Nanoparticles

Author

Musa Mutlu Can, Chasan Bairam, Seda Aksoy, Dürdane Serap Kuruca, Satoru Kaneko, Zerrin Aktaş, and Mustafa Oral Öncül

Subjects
oxide semiconductor, point defects, Néel relaxation, magnetic hyperthermia, superparamagnetic nanoparticles, Materials Chemistry, Surfaces and Interfaces, Surfaces, Coatings and Films
Abstract

The study was based on understanding the relationship between titanium (Ti) doping amount and magnetic heating performance of magnetite (Fe3O4). Superparamagnetic nanosized Ti-doped magnetite ((Fe1−x,Tix)3O4; x = 0.02, 0.03 and 0.05) particles were synthesized by sol-gel technique. In addition to (Fe1−x,Tix)3O4 nanoparticles, SiO2 coated (Fe1−x,Tix)3O4 nanoparticles were produced as core-shell structures to understand the effects of silica coating on the magnetic properties of nanoparticles. Moreover, the magnetic properties were associated with the Néel relaxation mechanism due to the magnetic heating ability of single-domain state nanoparticles. In terms of results, it was observed that the induced RF magnetic field for SiO2 coated (Fe0.97,Ti0.03)3O4 nanoparticles caused an increase in temperature difference (ΔT), which reached up to 22 °C in 10 min. The ΔT values of SiO2 coated (Fe0.97,Ti0.03)3O4 nanoparticles were very close to the values of uncoated Fe3O4 nanoparticles.

Published
2022
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7. Synthesis of Iron Gallate (FeGa2O4) Nanoparticles by Mechanochemical Method

Author

Musa Mutlu Can, Yeşim Akbaba, and Satoru Kaneko

Subjects
spinel oxide semiconductors, nanoparticle catalysts, inverse spinel, mechanochemical synthesis, gallates, Materials Chemistry, Surfaces and Interfaces, Surfaces, Coatings and Films
Abstract

The study was focused on optimizing the procedure of synthesizing iron gallate (FeGa2O4) nanoparticles by mechanochemical techniques. Due to a lack of information in the literature about the sequence of synthesis procedures of FeGa2O4 structures, the study is based on the establishment of a recipe for FeGa2O4 synthesis using mechanochemical techniques. Rotation speed, grinding media, and milling durations were the optimized parameters. At the end of each step, the structure of the resulting samples was investigated using the X-ray diffraction (XRD) patterns of samples. At the end of the processes, the XRD patterns of the samples milled under an air atmosphere were coherent with the XRD pattern of the FeGa2O4 structure. XRD patterns were analyzed employing Rietveld refinements to determine lattice parameters under the assumption of an inverse spinel crystal formation. Furthermore, a fluctuation at band gap values in the range of 2.39 to 2.55 eV was realized and associated with the excess Fe atoms in the lattice, which settled as defects in the crystal structures.

Published
2022
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