[2P01-53] Poster Presentation

[2P25] Hydrophobic Cu₂O surface fabricated by femtosecond laser-induced oxidation of a Cu substrate

*Tomoki Kakiuchi¹, Xi Yu², Yoshiki Tanaka¹, Takafumi Ishida³, Koh Saitoh³, Fumihiro Itoigawa¹, Makoto Kuwahara³, Shingo Ono¹ (1. Nagoya Institute of Technology, 2. Tokyo University of Science, 3. Nagoya University)

In this study, we developed a one-step method for fabricating hydrophobic surfaces on copper (Cu) substrates. Cuprous oxide (Cu₂O) with low free energy was successfully formed after low-fluence laser direct irradiation. The formation of Cu₂O enhanced the hydrophobicity of the Cu substrate surface, and the contact angle linearly increased with the proportion of Cu₂O. The Cu₂O fabricated by low-fluence laser treatment showed the same crystal plane orientation as the pristine Cu substrate, implying an epitaxial growth of Cu₂O on Cu.