Static Hydrophobic Cuprous Oxide Surface Fabricated via One-Step Laser-Induced Oxidation of a Copper Substrate

Xi Yu; Yoshiki Tanaka; Tomoki Kakiuchi; Takafumi Ishida; Koh Saitoh; Fumihiro Itoigawa; Makoto Kuwahara; Shingo Ono

doi:10.3390/mi14010185

Static Hydrophobic Cuprous Oxide Surface Fabricated via One-Step Laser-Induced Oxidation of a Copper Substrate

Micromachines (Basel). 2023 Jan 11;14(1):185. doi: 10.3390/mi14010185.

Authors

Xi Yu¹, Yoshiki Tanaka², Tomoki Kakiuchi², Takafumi Ishida^{1

3}, Koh Saitoh^{1

3}, Fumihiro Itoigawa², Makoto Kuwahara^{1

3}, Shingo Ono²

Affiliations

¹ Institute of Materials and Systems for Sustainability, Nagoya University, Nagoya 464-8603, Japan.
² Department of Engineering, Nagoya Institute of Technology, Nagoya 466-8555, Japan.
³ Graduate School of Engineering, Nagoya University, Nagoya 464-8603, Japan.

Abstract

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 a Cu substrate.

Keywords: femtosecond laser processing; hydrophobic surface; surface modification.

Abstract

Grants and funding