Transient phenomena analysis of metal precipitation using local heating induced by multiphoton deactivation

2022 Fiscal Year Final Research Report

• Project/Area Number: 20H02043
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Basic Section 18020:Manufacturing and production engineering-related
• Research Institution: Nagaoka University of Technology
• Principal Investigator: Mizoshiri Mizue 長岡技術科学大学, 工学研究科, 准教授 (70586594)
• Co-Investigator(Kenkyū-buntansha): 山岸 里枝 (田邉里枝) 福岡工業大学, 工学部, 教授 (70432101)
• Project Period (FY): 2020-04-01 – 2023-03-31
• Keywords: 光熱還元 / 過渡現象 / 多光子吸収 / 金属錯体 / フェムト秒レーザ

Outline of Final Research Achievements

Various metals and their alloys were directly written using multiphoton absorption induced thermochemical reduction. Glyoxylic acid metal (Cu, Ni, Co, and Fe) complex inks, which exhibited high transparencies at femtosecond laser pulses and intense absorption at the half of the wavelength were respectively prepared. When the femtosecond laser pulses were focused into the inks, materials such as metals and metal oxides were precipitated around the focal spot. The precipitated metals were oxidized with the order of Cu<Ni<Co<Fe. Metal Fe was not precipitated in air. Glyoxylic acid Co complex ink was used to evaluate the transient oxidation of Co because Co and CoO were selectively precipitated by the laser scanning speed for direct writing. The time-resolved transmittance of the precipitation was measured using a pump-probe technique, resulting that the oxidation was caused within 550 ps in air.

Free Research Field

レーザ微細加工

Academic Significance and Societal Importance of the Research Achievements

本研究は，従来実現できなかったAuやAg以外の金属の大気中直接描画を実現できることを明らかにした．プリンタブルエレクトロニクスの発展に伴い，オンデマンド製造技術のひとつとして，コモンメタルのプリント技術の需要が高まっており，機能性材料であっても待機中でプリントできる可能性を示唆した大変有意義な知見と考えられる．