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589 results on '"Mori, Hirotaro"'

4. Quantum de-trapping and transport of heavy defects in tungsten

Author

Arakawa, Kazuto, Marinica, Mihai-Cosmin, Fitzgerald, Steven, Proville, Laurent, Nguyen-Manh, Duc, Dudarev, Sergei L., Ma, Pui-Wai, Swinburne, Thomas D., Goryaeva, Alexandra M., Yamada, Tetsuya, Amino, Takafumi, Arai, Shigeo, Yamamoto, Yuta, Higuchi, Kimitaka, Tanaka, Nobuo, Yasuda, Hidehiro, Yasuda, Tetsuya, and Mori, Hirotaro

Published
2020
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26. Athermal Solid Phase Reaction in Pt/SiOx Thin Films Induced by Electron Irradiation

Author

1000070314424, Sato, Kazuhisa, 1000010024366, Mori, Hirotaro, 1000070314424, Sato, Kazuhisa, 1000010024366, and Mori, Hirotaro

Abstract

Kazuhisa Sato and Hirotaro Mori, Athermal Solid Phase Reaction in Pt/SiOx Thin Films Induced by Electron Irradiation, ACS Omega, 2021, 6 (33), 21837-21841., Microelectronics based on Si requires metal silicide contacts. The ability to form platinum silicide (Pt₂Si) by electronic excitation instead of thermal processes would benefit the field. We studied the effects of electron irradiation on Pt₂Si formation in composite films-composed of Pt and amorphous silicon oxides (a-SiOx)-by transmission electron microscopy and electron diffraction. Pt₂Si formed in Pt/a-SiOx bilayer and a-SiOx/Pt/a-SiOx sandwiched films by 75 keV electron irradiation, at 298 and 90 K. The reaction is attributable to dissociation of SiOx triggered by electronic excitation. In a-SiOx/Pt/a-SiOx sandwiched films, reflections of pure Pt were not present after irradiation, i.e., Pt was completely consumed in the reaction to form Pt₂Si at 298 K. However, in Pt/a-SiOx bilayer films, unreacted Pt remained under the same irradiation conditions. Thus, it can be said that the extent of the interfacial area is the predominant factor in Pt₂Si formation. The morphology of Pt islands extensively changed during Pt₂Si formation even at 90 K. Coalescence and growth of metallic particles (Pt and Pt-Si) are not due to thermal effects during electron irradiation but to athermal processes accompanied by silicide formation. To maintain the reaction interface between metallic particles and the dissociation product (i.e., Si atoms) by electronic excitation, a considerable concomitant morphology change occurs. Elemental analysis indicates that the decrease in Si concentration near Pt is faster than the decrease in O concentration, suggesting formation of a Si depletion zone in the amorphous silicon oxide matrix associated with formation of Pt₂Si.

Published
2021

33. Coating carbon nanotubes with inorganic materials by pulsed laser deposition

Author

Ikuno, Takashi, Yasuda, Tatsuro, Shin-ichi Honda, Oura, Kenjiro, Katayama, Mitsuhiro, Jung-Goo Lee, and Mori, Hirotaro

Subjects
Electrophoretic deposition -- Methods, Nanotubes -- Structure, Inorganic compounds -- Chemical properties, Physics
Abstract

Coaxial of carbon nanotubes (CNTs) with various inorganic materials are performed using pulsed laser deposition. The morphology and crystallinity of the coated layers were found to differ according to the materials used even at the same deposition temperature.

Published
2005

34. Long-range order parameter of single L1(sub 0)-FePd nanoparticle determined by nanobeam electron diffraction: Particle size dependence of the order parameter

Author

Sato, Kazuhisa, Hirotsu, Yoshihiko, Mori, Hirotaro, Zhouguang Wang, and Hirayama, Tsukasa

Subjects
Nanoparticles -- Research, Iron compounds -- Electric properties, Lead compounds -- Electric properties, Electrons -- Diffraction, Electrons -- Analysis, Physics
Abstract

The long-range order (LRO) parameter (S) of single isolated L1(sub 0)-FePd nanoparticle is obtained by quantitative analysis of nanobeam electron diffraction (NBD) intensities and intensity calculations considering the multiple scattering of electrons. The lattice parameter, the alloy composition, and the particle thickness, which are useful in the LRO parameter determination, are evaluated by transmission electron microscopy.

Published
2005

35. Asymmetrically modified silica particles: A simple particulate surfactant for stabilization of oil droplets in water

Author

Takahara, Yoshiko K., Sakata, Takao, Ikeda, Shigeru, Hasegawa, Toshiaki, Mori, Hirotaro, Ishino, Satoru, Ikeue, Keita, Ohtan, Bunsho, Tachi, Koji, and Matsumura, Michio

Subjects
Organic solvents -- Research, Silica -- Chemical properties, Chemistry
Abstract

Spherical silica particles that are able to assemble at a phase boundary of a dual-phase mixture of water and an immiscible organic solvent were prepared by a partial modification of their surface hydroxyl groups with an alkylsilylation agent. It was found that these particles were able to form a micellar structure in water in the presence of an organic solution of a toluene/polystyrene mixture.

Published
2005

49. Application of Ti-containing mesoporous silica (single-site photocatalyst) and photo-assisted deposition (PAD) method for preparation of nano-sized Pt metal catalyst

Author

Yamashita, Hiromi, primary, Shimizu, Toshiaki, additional, Mimura, Naoki, additional, Shimada, Makoto, additional, Yuan, Shuai, additional, Mori, Kohsuke, additional, Ohmichi, Tetsutaro, additional, Katayama, Iwao, additional, Sakata, Takao, additional, and Mori, Hirotaro, additional

Published
2007
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