Amorphous nanostructuralization in HOPG by 1014 W cm-2 laser

9th International Conference on Inertial Fusion Sciences and Applications

Nishimura, Yasuhiko^1,2 ; Kitagawa, Yoneyoshi^1 ; Mori, Yoshitaka^1 ; Ishii, Katsuhiro^1 ; Hanayama, Ryohei^1 ; Azuma, Hirozumi^3 ; Hioki, Tatsumi^4 ; Nishi, Teppei^5 ; Motohiro, Tomoyoshi^4,5 ; Komeda, Osamu^6 ; Sekine, Takashi^7 ; Sato, Nakahiro^7 ; Kurita, Takashi^7 ; Kawashima, Toshiyuki^7 ; Kan, Hirofumi^7 ; Sunahara, Atsushi^8 ; Sentoku, Yasuhiko^9 ; Miura, Eisuke^10

Graduate School for the Creation of New Photonics Industries, 1955-1 Kurematsu-cho, Nishi-ku, Shizuoka Hamamatsu

431-1202, Japan^1

Toyota Technical Development Corporation, 1-21 Imae Hanamoto-cho, Aichi, Toyota

470-0334, Japan^2

Aichi Synchrotron Radiation Center, 250-3 Minamiyamaguchi-cho, Seto, Aichi

489-0965, Japan^3

Green Mobility Collaborative Research Center, Nagoya University, Furo-cho, Chikusa-ku, Aichi, Nagoya

464-8601, Japan^4

Toyota Central Research and Development Laboratories, Inc., 41-1 Yokomichi, Nagakute, Aichi

480-1192, Japan^5

Toyota Motor Corporation, 1200 Mishuku, Susono, Shizuoka

410-1193, Japan^6

Hamamatsu Photonics K.K., 1820 Kurematsu-cho, Nishi-ku, Shizuoka Hamamatsu

431-1202, Japan^7

Institute for Laser Technology, 1-8-4 Utsubo-honmachi, Nishi-ku, Osaka

550-0004, Japan^8

Department of Physics, University of Nevada, Reno 1664 N Virginia Street, Reno

NV

89557, United States

(10) National Institute of Advanced Industrial Science and Technology, 1-1-1 Umezono, Ibaraki Tsukuba

305-8568, Japan^9

关键词: Compression techniques;    Highly oriented pyrolytic graphite;    Impact pressures;    Laser-driven shock waves;    Pulsewidths;    Single shots;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/717/1/012073/pdf
DOI  :  10.1088/1742-6596/717/1/012073

来源: IOP

【 摘 要 】

This reports provide an amorphous nanostructuralization technique on the surface modification in Highly Oriented Pyrolytic Graphite (HOPG) by using a femtosecond laser. We showed, for the first time, that the surface of HOPG is changed to the amorphous nanostructuralization graphite by using a femtosecond laser-driven compression technique. Our results also suggest that the HOPG surface is changed until the deeper area from the surface by the laser-driven shock wave. A single shot of a femtosecond laser beam (1.27 ∼ 1.33x1014Wcm∼2in intensity, with 2 mm-diameter, and 110 fs in pulse width) is irradiated under the vacuum ambience onto a 2 mm-thick of HOPG. The calculated impact pressures on a sample was 8.3 ∼ 8.7 GPa. Crystal structure in the HOPG were analyzed using a Raman spectroscopy and an X-ray diffraction, those analyzing depth from the surface were 50 nm and 350 μm, respectively.