Presentation Information
[2E06]Electronic state and chemical reactivity of graphite edge surfaces fabricated by ultrashort-pulse-laser processing: synchrotron-based micro-XPS study
*Hirobumi Umeyama1, Shuntaro Tani2, Fumihiko Ozaki1, Wei-Chih Hsiao1, Yoshiko Sakaguchi1, Yuyun Tan1, Kozo Mukai1, Takushi Iimori1, Shunsuke Tanaka1, Jun Yoshinobu1 (1. The Institute for Solid State Physics, The University of Tokyo, 2. RIKEN)
This study aims the elucidation of the atomic-level mechanism of rubber reinforcement by carbon black. We fabricated graphite edge surfaces using ultrashort-pulse-laser processing and analyzed via synchrotron-based micro-XPS. Compared to the basal surface, the edge surface exhibited metallic states near the Fermi level and a low-binding-energy component at 283.5 eV in the C 1s spectra. After thermal cleaning, the surfaces were exposed to O2, H2O, and formic acid. O2 and H2O reacted more with basal surface, while formic acid showed significant reactivity with edge surface. After chemical reaction, the edge-specific electronic states and C 1s components at 283.5 eV decreased, indicating the presence of active sites on the edge surface. These results suggest that edge and basal surfaces have different chemical reactivities and adsorption mechanisms. This work contributes to understanding long-standing hypotheses about carbon black’s reinforcement effect on rubber.