Research papers

• Dongshuang Wu, Kohei Kusada, Tomokazu Yamamoto, Takaaki Toriyama, Syo Matsumura, Ibrahima Gueye, Okkyun Seo, Jaemyung Kim, Satoshi Hiroi, Osami Sakata, Shogo Kawaguchi, Yoshiki Kubota, Hiroshi Kitagawa. On the electronic structure and hydrogen evolution reaction activity of platinum group metal-based high-entropy-alloy nanoparticles. Chemical Science. 11 [47] (2020) 12731-12736 10.1039/d0sc02351e
• Chulho Song, Okkyun Seo, Daiju Matsumura, Satoshi Hiroi, Yi-Tao Cui, Jaemyung Kim, Yanna Chen, Akhil Tayal, Kohei Kusada, Hirokazu Kobayashi, Hiroshi Kitagawa, Osami Sakata. Hydrogen absorption and desorption on Rh nanoparticles revealed by in situ dispersive X-ray absorption fine structure spectroscopy. RSC Advances. 10 [34] (2020) 19751-19758 10.1039/d0ra03322g
• Jaemyung Kim, Okkyun Seo, Satoshi Hiroi, Yoshihiro Irokawa, Toshihide Nabatame, Yasuo Koide, Osami Sakata. Surface morphology smoothing of a 2 inch-diameter GaN homoepitaxial layer observed by X-ray diffraction topography. RSC Advances. 10 [4] (2020) 1878-1882 10.1039/c9ra08882b

Presentations

• SAKATA, Osami, KIM, Jaemyung, SEO, Okkyun. Mapping of local orientation of lattice planes of a GaN wafer. The 11th International Conference on Advanced Materials and Devices. 2019
• 坂田 修身, キム ジェミョン, ソ オッキュン. GaN(0001) の表面にほぼ垂直な格子面の局所的なまがりの可視化. 日本結晶学会 令和元年（2019年）度年会. 2019
• SEO, Okkyun, KIM, Jaemyung, HIROI, Satoshi, IROKAWA, Yoshihiro, NABATAME, Toshihide, KOIDE, Yasuo, SAKATA, Osami. Characterization of a GaN wafer and a homo-epitaxial layer by synchrotron X-ray topography techniques. The 66th JSAP Spring Meeting, 2019. 2019

Patents