Laser-based fabrication of precise metal structures

• Project/Area Number: 18K18958
• Research Category: Grant-in-Aid for Challenging Research (Exploratory)
• Allocation Type: Multi-year Fund
• Review Section: Medium-sized Section 26:Materials engineering and related fields
• Research Institution: Keio University
• Principal Investigator: Terakawa Mitsuhiro 慶應義塾大学, 理工学部(矢上), 准教授 (60580090)
• Project Period (FY): 2018-06-29 – 2021-03-31
• Project Status: Completed (Fiscal Year 2020)
• Budget Amount: ¥6,240,000 (Direct Cost: ¥4,800,000、Indirect Cost: ¥1,440,000); Fiscal Year 2020: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000); Fiscal Year 2019: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000); Fiscal Year 2018: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
• Keywords: レーザー付加加工 / 三次元金属構造 / 高分子材料

Outline of Final Research Achievements

This study was performed with the aim of developing the fabrication method based on the multiphoton photoreduction for high density and precise metal microstructure. Shrinkage of metal microstructures was demonstrated concurrently with the volume change of the supporting pNIPAM hydrogel by light stimulation. Electron microscopy revealed that the fabricated structure was composed of metal nanoparticles with a diameter of around 10 nanometers. The heat accumulation by the use of high repetition rate laser pulses was considered to be effective to induce partial thermal melting.

Academic Significance and Societal Importance of the Research Achievements

作製した金属微細構造の寸法変化が可能であることを実験実証するとともに、生成する金属微細構造がナノ粒子ならびにそれらのクラスターから構成されることを明らかにした。この成果は、多光子還元により作製した金属微細構造を可変光学特性を活用した応用に展開できること意味している。さらに、研究開始当初は想定していなかった成果として、金属微細構造の配置によってハイドロゲルの体積相転移を局所的に誘起することが可能であり、当該技術がソフトアクチュエーターにも展開できることを示した。

Research Products

• [Int'l Joint Research] Bulgarian Academy of Sciences(ブルガリア)
• [Int'l Joint Research] Laser Zentrum Hannover e.V.(ドイツ)
• [Int'l Joint Research] Laser Zentrum Hannover e.V.(ドイツ)
• [Journal Article] Multiphoton photoreduction for dual-wavelength-light-driven shrinkage and actuation in hydrogel (2020)
  • Author(s): Kosuke Mizuguchi, Yo Nagano, Hiroaki Nishiyama, Hiroaki Onoe, Mitsuhiro Terakawa
  • Journal Title: Optical Materials Express Volume: 10 Issue: 8 Pages: 1931-1931
  • DOI: 10.1364/ome.399874
  • Peer Reviewed / Open Access
• [Presentation] 多光子還元法を利用した温度応答性ハイドロゲルの受動的透過率制御 (2021)
  • Author(s): 富川啓文、長野陽、寺川光洋
  • Organizer: 第68回応用物理学会春季学術講演会
• [Presentation] Femtosecond laser-induced modification of elastomers to conductive materials (2020)
  • Author(s): Mitsuhiro Terakawa, Shuichiro Hayashi, Fumiya Morosawa, Nikolay Nedyalkov
  • Organizer: 21st International School on Quantum Electronics "Laser Physics and Applications
  • Int'l Joint Research / Invited
• [Presentation] Fabrication of the light-responsive microchannel inside hydrogel (2020)
  • Author(s): Yo Nagano, Kosuke Mizuguchi, Hiroaki Onoe, Mitsuhiro Terakawa
  • Organizer: 21st International Symposium on Laser Precision Microfabrication 2020 (LPM2020)
  • Int'l Joint Research
• [Presentation] Metal microstructure in hydrogel fabricated by multiphoton photoreduction for light-stimulated shrinkage (2020)
  • Author(s): K. Mizuguchi, Y. Nagano, H. Onoe, M. Terakawa
  • Organizer: SPIE Photonics West 2020
  • Int'l Joint Research
• [Presentation] 多光子還元法による収縮性金属構造の作製 (2020)
  • Author(s): 水口晃介、尾上弘晃、寺川光洋
  • Organizer: レーザー学会学術講演会第40回年次大会
• [Presentation] 金イオン含有ハイドロゲルへのフェムト秒レーザ照射による金ダブルトラック構造の作製 (2019)
  • Author(s): 片山暁人、寺川光洋
  • Organizer: 第92回レーザ加工学会講演会
• [Presentation] 多光子還元によるハイドロゲル内部への金属微細構造の作製 (2019)
  • Author(s): 寺川光洋
  • Organizer: OCU先端光科学シンポジウム(2019)
  • Invited
• [Presentation] Fabrication of Metal Microstructures in Elastic Hydrogel by Multiphoton Photoreduction (2019)
  • Author(s): M. Terakawa, M. Machida, H. Onoe, T. Niidome, A. Heisterkamp
  • Organizer: 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)
  • Int'l Joint Research
• [Presentation] Laser Direct Writing of Multi-Metal Microstructures in Hydrogel, From Core-Shell Nanoparticle Formation to Spatially-Selective Plasmon Absorption (2019)
  • Author(s): Manan Machida, Takuro Niidome, Hiroaki Onoe, Alexander Heisterkamp, Mitsuhiro Terakawa
  • Organizer: 2019 MRS, Fall Meeting
  • Int'l Joint Research
• [Presentation] Integrating soft materials and metal microstructures by femtosecond laser processing (2019)
  • Author(s): Mitsuhiro Terakawa, Yasutaka Nakajima, Shuichiro Hayashi, A. Katayama, O. Suttmann, N. Nedyalkov, A. Heisterkamp
  • Organizer: SPIE Photonics West 2019
  • Int'l Joint Research / Invited
• [Presentation] Fabrication of conductive silver structure inside a hydrogel by femtosecond laser-induced photoreduction (2019)
  • Author(s): Toshihiko Uemura, Manan Machida, Alexander Heisterkamp, Hiroaki Onoe, Mitsuhiro Terakawa
  • Organizer: International Symposium on SSS Laser Processing at Keio University
  • Int'l Joint Research
• [Presentation] Akito Katayama, Kazuki Eda, Manan Machida, Mitsuhiro Terakawa (2019)
  • Author(s): Femtosecond-laser-based synthesis of high-density silver nanoparticles in gelatin
  • Organizer: International Symposium on SSS Laser Processing at Keio University
  • Int'l Joint Research