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Article

Cu Patterning Using Femtosecond Laser Reductive Sintering of CuO Nanoparticles under Inert Gas Injection

Department of Mechanical Engineering, Nagaoka University of Technology, Niigata 940-2188, Japan
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Academic Editor: Alina A. Manshina
Materials 2021, 14(12), 3285; https://doi.org/10.3390/ma14123285
Received: 14 May 2021 / Revised: 1 June 2021 / Accepted: 7 June 2021 / Published: 14 June 2021
(This article belongs to the Special Issue Laser Technologies in Metal-Based Materials)
In this paper, we report the effect of inert gas injection on Cu patterning generated by femtosecond laser reductive sintering of CuO nanoparticles (NPs). Femtosecond laser reductive sintering for metal patterning has been restricted to metal and metal-oxide composite materials. By irradiating CuO-nanoparticle paste with femtosecond laser pulses under inert gas injection, we intended to reduce the generation of metal oxides in the formed patterns. In an experimental evaluation, the X-ray diffraction peaks corresponding to copper oxides, such as CuO and Cu2O, were much smaller under N2 and Ar gas injections than under air injection. Increasing the injection rates of both gases increased the reduction degree of the X-ray diffraction peaks of the CuO NPs, but excessively high injection rates (≥100 mL/min) significantly decreased the surface density of the patterns. These results qualitatively agreed with the ratio of sintered/melted area. The femtosecond laser reductive sintering under inert gas injection achieved a vacuum-free direct writing of metal patterns. View Full-Text
Keywords: Cu pattern; CuO nanoparticle ink; femtosecond laser reductive sintering; inert gas injection Cu pattern; CuO nanoparticle ink; femtosecond laser reductive sintering; inert gas injection
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MDPI and ACS Style

Mizoshiri, M.; Yoshidomi, K. Cu Patterning Using Femtosecond Laser Reductive Sintering of CuO Nanoparticles under Inert Gas Injection. Materials 2021, 14, 3285. https://doi.org/10.3390/ma14123285

AMA Style

Mizoshiri M, Yoshidomi K. Cu Patterning Using Femtosecond Laser Reductive Sintering of CuO Nanoparticles under Inert Gas Injection. Materials. 2021; 14(12):3285. https://doi.org/10.3390/ma14123285

Chicago/Turabian Style

Mizoshiri, Mizue, and Kyohei Yoshidomi. 2021. "Cu Patterning Using Femtosecond Laser Reductive Sintering of CuO Nanoparticles under Inert Gas Injection" Materials 14, no. 12: 3285. https://doi.org/10.3390/ma14123285

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