Fabrication of Oriented Carbon Nanowire Arrays via Solid-State Polymerization in Ultrafine Nanospaces

2023 Fiscal Year Final Research Report

• Project/Area Number: 21K19004
• Research Category: Grant-in-Aid for Challenging Research (Exploratory)
• Allocation Type: Multi-year Fund
• Review Section: Medium-sized Section 35:Polymers, organic materials, and related fields
• Research Institution: Kyoto Institute of Technology
• Principal Investigator: Sakurai Tsuneaki 京都工芸繊維大学, 分子化学系, 准教授 (50632907)
• Project Period (FY): 2021-07-09 – 2024-03-31
• Keywords: ナノワイヤ / 垂直配向 / 直立構造 / 粒子線 / 固相重合 / ヘテロ界面

Outline of Final Research Achievements

The unique method in this research yields wire-shaped nano-objects with controlled length and number density by just tuning the thickness of the target thin films and fluence of the incident high-energy ion beams, respectively. High-energy particles give their kinetic energy to a limited nm-sized cylindrical area along their trajectories, affording insoluble nanogels (nanowires) via polymerization and cross-linking of the materials. We have established the method to allow uniaxially-aligned vertical nanowire arrays and their functionalization by using small molecular materials as starting materials and applying sublimation instead of solvent immersion. After the nanowires formed by irradiations, the use of sublimation results in the uniaxially-orientated nanowires. Block-co-type and coaxial-type nanowires were prepared by using bilayer organic films as starting films and by the post-electropolymerization of thiophenes around oriented nanowires on an electrode, respectively.

Free Research Field

機能物性化学

Academic Significance and Societal Importance of the Research Achievements

無機材料ではSiやZnO等の半導体ナノワイヤの「ボトムアップ成長」や「電子線リソグラフィによるトップダウン構築」が確立され、垂直配向ワイヤの報告例がある。一方、有機材料では一部の有機化合物を結晶成長制御でのみ達成されており、可能な有機物の種類が極めて限定的であるばかりか、その径は100 nm以上であり、ナノワイヤと呼ぶには大きな構造体であった。本研究成果は、この背景を覆す革新的なものである。
本成果は、半導体微細加工技術の革新につながることが期待される。また、極微細な直立ナノワイヤの巨大表面積を利用した化学物質・ウィルス等を対象にした高感度センサーや、高効率な触媒特性表面への展開も期待される。