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Atomic Layer Epitaxy of Nitrogen-Doped ZnSe
TAKEMURA, YASUSHI,KONAGAI, MAKOTO,YAMASAKI, KANAME,LEE, C.H.,TAKAHASHI, KIYOSHI 全北大學校 基礎科學硏究所 1994 基礎科學 Vol.16 No.-
Atomic layer epitaxy of nitrogen-doped ZnSe was studied. The ZnSe films were grown on GaAs(001) substrates at 250℃ with a continuous flow of nitrogen and alternate supplies of zinc and selenium. The grown films were characterized by photoluminescence spectra at 4.2K, and it was found that nitrogen was incorporated as a shallow acceptor in the films. The Schottky diodes were prepared by evaporation gold on the nitrogen-doped films grown on p-type GaAs substrates. A rectifying characteristic that was consistent with the structure, assuming p-type conductivity of ZnSe, was observed. Catacitance-voltage measurement of the structure also indicated p-type conductivity of the films.
Evaluation of Magnetic and Thermal Properties of Ferrite Nanoparticles for Biomedical Applications
Asahi Tomitaka,Minhong Jeun,Seongtae Bae,Yasushi Takemura 한국자기학회 2011 Journal of Magnetics Vol.16 No.2
Magnetic nanoparticles can potentially be used in drug delivery systems and for hyperthermia therapy. The applicability of Fe₃O₄, CoFe₂O₄, MgFe₂O₄, and NiFe₂O₄ nanoparticles for the same was studied by evaluating their magnetization, thermal efficiency, and biocompatibility. Fe₃O₄ and CoFe₂O₄ nanoparticles exhibited large magnetization. Fe₃O₄ and NiFe₂O₄ nanoparticles exhibited large induction heating. MgFe₂O₄ nanoparticles exhibited low magnetization compared to the other nanoparticles. NiFe₂O₄ nanoparticles were found to be cytotoxic, whereas the other nanoparticles were not cytotoxic. This study indicates that Fe₃O₄ nanoparticles could be the most suitable ones for hyperthermia therapy.