[3Fa01-05] Surface Engineering/Thin Film

[3Fa01] Carbonization of molybdenum substrate surface and nanoparticles by femtosecond laser irradiation in hexane

*Yoshiki Tanaka¹, Xi Yu², Toru Asaka¹, Fumihiro Itoigawa¹, Shingo Ono¹ (1. Nagoya Institute of Technology, 2. Tokyo University of Science)

Nanoparticles of carbides are used in various applications. For example, silicon carbide is used as light-receiving devices and light-emitting devices. Also transition metal carbides, such as molybdenum carbide, are expected as an alternative of noble metal catalyst. Various methods to fabricate carbide nanoparticles are reported, such as chemical vapor deposition (CVD) and reduction method. To find a new simple way to fabricate carbide nanoparticles, we focused on the high temperature and pressure state induced by femtosecond laser ablation in liquid environment. By using a one-step method of laser ablation on Mo substrate in hexane, we simultaneously achieved carbonization of Mo nanoparticles and Mo substrate surface. This simple synthesis method for MoC may provide a new choice for the preparation of MoC-based devices and nanomaterials, which can accelerate the revolution of replacing noble-metal-based catalysts with more economical Mo-based catalysts.