Mechanistic study of impact penetration of two-dimensional materials due to high-velocity injection of nanoparticles

2022 Fiscal Year Final Research Report

• Project/Area Number: 20K20966
• Research Category: Grant-in-Aid for Challenging Research (Exploratory)
• Allocation Type: Multi-year Fund
• Review Section: Medium-sized Section 18:Mechanics of materials, production engineering, design engineering, and related fields
• Research Institution: Chuo University
• Principal Investigator: Yonezu Akio 中央大学, 理工学部, 教授 (40398566)
• Project Period (FY): 2020-07-30 – 2023-03-31
• Keywords: グラフェン / レーザー誘起粒子射出法 / AFMナノインデンテーション / ナノポア / 分子動力学 / 衝撃貫通力学

Outline of Final Research Achievements

This study developed a nanopore processing method which is applicable to mono-layer graphene (a two-dimensional material), and ultimately aimed to create nanoporous graphene. Specifically, the fracture phenomenon of particle penetration, which forms nanopores by penetrating small particles into graphene at high velocity, is used as a nanopore processing. Here, we developed a technique for ejecting micro and nano particles at high velocity by pulsed laser ablation. After improving the particle launcher and optimizing the ablation source, it was found that the velocity reached over 1000m/s when measured with a high-speed camera. Furthermore, we performed contact and collision experiments of nanoparticles on graphene, and clarified the fracture behavior and formation mechanics of nanopores using molecular dynamics (MD) simulation.

Free Research Field

機械材料・材料力学

Academic Significance and Societal Importance of the Research Achievements

細孔（ナノポア）を有する2次元材料の単層グラフェンは，各種フィルター，海水淡化，DNAシーケンサー，キャパシターなど新たな工学的応用が期待され，実用化に向けた研究がなされている一方，ナノポア加工を実現する技術は開発段階である．本研究では，レーザーアブレーションによるマイクロ・ナノ粒子の高速射出技術を開発し，粒子貫通による細孔加工を提案している．これは少量の粒子群を射出することで，非接触かつ一括でナノポア加工が行えることから開発意義は大きい．また，今までにない超高速なマイクロ・ナノ粒子衝突を実現するため新たな表面改質や材料開発の研究へ応用できると期待されている．