講演情報
[9p-N306-8]Pressure-driven graphitization under femtosecond laser irradiation
〇(D)Weiye Jin1,2, Huijie Sun2, Yusuke Ito2, Jiayun Pei1, Haiyan Zhao1 (1.Tsinghua Univ., 2.the Univ. of Tokyo)
キーワード：
laser induced graphene、Ultrafast imaging、molecular dynamics
Laser-induced graphene (LIG), a porous graphene structure directly written on polymers by laser irradiation, has emerged as a promising platform for on-demand patterning of carbon-based electronics, sensors, and energy devices. Despite growing research interest, the influence of transient pressure generated during femtosecond laser–matter interactions has received limited attention. In this work, we develop a comprehensive investigation framework by integrating ultrafast pump–probe interferometry, large-scale molecular dynamics (MD) simulations, and explainable artificial intelligence (XAI) to uncover the role of transient pressure in the femtosecond LIG process. Time-resolved imaging reveals the formation of localized pressure waves during laser irradiation of polyimide, establishing pressure as a fundamental component of the laser–induced transformation. MD simulations further indicate that elevated pressure facilitates the ordering and stacking of graphene layers, enhancing the continuity and planarity of graphitic networks. Through XAI analysis, we quantitatively evaluate the influence of multiple parameters and identify pressure as a key determinant in the structural evolution. These findings shed light on a previously underexplored factor in LIG and open new possibilities for precision control in laser-directed carbon nanomanufacturing.