Femtosecond laser direct writing of Cu–Ni alloy patterns in ambient atmosphere using glyoxylic acid Cu/Ni mixed complexes. (December 2021)

• Record Type: Journal Article
• Authors: Mizoshiri, Mizue; Hayashi, Tomohide; Narushima, Junya; Ohishi, Tomoji
• Is Part Of: Optics & laser technology. Volume 144(2021)
• Publication Date: 2021-12
• Subjects: Direct writing -- Glyoxylic acid metal complex -- Femtosecond laser -- Copper -- Nickel -- Copper-nickel alloy; CW Continuous-wave -- EDS Energy-dispersive X-ray spectroscopy -- XRD X-ray diffraction; Optics -- Periodicals; Lasers -- Periodicals; Electronic journals; 621.366
• DOI: 10.1016/j.optlastec.2021.107418
• Languages: English
• ISSNs: 0030-3992

Abstract

Highlights: Cu, Ni, and Cu–Ni patterns were formed by femtosecond laser thermal reduction. Glyoxylic acid metal (Cu, Ni, and Cu/Ni mixed) complexes were synthesized. A thermoelectric couple (p-type Cu and n-type Cu–Ni alloy) generated voltages. Abstract: This paper presents the direct writing of thermoelectric couples composed of Cu–Ni alloy in ambient atmosphere. Patterns of Cu, Ni, and Cu–Ni alloys were directly written by the rapid heating and reduction of glyoxylic acid metal (Cu, Ni, and Cu/Ni mixed) complexes on glass substrates using femtosecond laser pulses without significant oxidation. The Seebeck coefficient of the patterns depended on the concentration ratio of Cu to Ni in the alloy, which could be controlled by the concentrations of the glyoxylic acid Cu/Ni mixed complex. A thermoelectric couple composed of p-type Cu and n-type Cu–Ni alloy generated an open-circuit voltage depending on the temperature gradient. This direct writing technique of pure metal and alloy allows various sensors to be printed in air.