[12p-B410-1~16] 3.7 Laser processing

△ [12p-B410-10] Fabrication of Electrically Conductive Structures by Femtosecond-Laser-Induced Carbonization of Cellulose Nanofiber Films

〇Fumiya Morosawa¹, Shuichiro Hayashi², Mitsuhiro Terakawa^1,2 (1.Keio Univ., 2.Grad. Sch. Keio Univ.)

Keywords:Femtosecond laser, Cellulose nanofiber, Carbonization

In this study, we demonstrate the fabrication of electrically conductive structures by femtosecond-laser-carbonization of cellulose nanofiber (CNF) films. The Raman spectra of the fabricated structures were observed around 1350 cm^-1 and 1600 cm^-1. These peaks correspond to the peaks of graphene’s D and G band, respectively, indicating the formation of graphitic carbon. Structures fabricated with lower laser powers did not indicate electrical conductivity. Additionally, for the structures that did not indicate electrical conductivity, D and G bands were not observed from the Raman spectra. From such results, it can be speculated that the formation of graphitic carbon is attributable to the electrical conductivity of the formed structures.