Fabrication Process and Chiral Functions of 3D Metal Nanostructures and Their Chiral Functions

2020 Fiscal Year Final Research Report

• Project Area: Coordination Asymmetry: Design of Asymmetric Coordination Sphere and Anisotropic Assembly for the Creation of Functional Molecules
• Project/Area Number: 16H06515
• Research Category: Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)
• Allocation Type: Single-year Grants
• Review Section: Science and Engineering
• Research Institution: Doshisha University (2017-2020); Tokyo Institute of Technology (2016)
• Principal Investigator: Iyoda Tomokazu 同志社大学, ハリス理化学研究所, 教授 (90168534)
• Co-Investigator(Kenkyū-buntansha): 鎌田 香織 防衛医科大学校(医学教育部医学科進学課程及び専門課程、動物実験施設、共同利用研究施設、病院並びに防衛, 進学課程, 講師 (00361791) ; 金 仁華 神奈川大学, 工学部, 教授 (60271136)
• Project Period (FY): 2016-06-30 – 2021-03-31
• Keywords: マイクロコイル / キラルシリカ / キラル転写 / テラヘルツ / 電波吸収 / バイオテンプレート / 円偏光発光 / X線マイクロCT

Outline of Final Research Achievements

The objective in our study was set to “transcribing asymmetric structure”, “exploiting asymmetric functions”, and “creating asymmetric materials”, by targeting (1) left-handed metal microcoils biotemplated from coiled algae, Spirulina, and (2) chiral silica based on twisted structure of silicon-centered tetrahedrons. The present study has achieved (1) mass production method of left-handed metal microcoils by biotemplate process and their dispersion sheets, which shows highly efficient electromagnetic absorption on millimeter wave and terahertz regions with a giant circular dichroism, (2) chiral template process to fabricate various kinds of optically active inorganic materials by using newly established “chiral silica” from supramolecular complexation between polyethylene imine and chiral organic acids.

Free Research Field

ナノ・マイクロ材料化学

Academic Significance and Societal Importance of the Research Achievements

本研究は、らせん藻類由来の片巻き金属マイクロコイルと有機酸・ポリエチレンイミン錯体を触媒テンプレートとするキラルシリカのねじれ構造を起源とするアシンメトリー機能の創成をめざし、①次世代通信規格Beyond 5G/6Gのミリ波・テラヘルツ帯の電波吸収、コイル１本からの再放射パターン可視化による高効率電波吸収のメカニズム解明、電界誘起マイクロモーターの原理実証し、キラルシリカ創成とケイ素中心の普遍的な構造アシンメトリーを明らかにした。