2020 Fiscal Year Final Research Report
Development of carbon nanotubes with high nominal tensile strength by defect healing process
| Project/Area Number |
19K14837
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| Research Category |
Grant-in-Aid for Early-Career Scientists
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| Allocation Type | Multi-year Fund |
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| Review Section |
Basic Section 18010:Mechanics of materials and materials-related
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| Research Institution | Tohoku University |
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Principal Investigator |
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| Project Period (FY) |
2019-04-01 – 2021-03-31
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| Keywords | カーボンナノチューブ / 欠陥修復 / 層間架橋結合 / 公称強度 / 分子動力学 |
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| Outline of Final Research Achievements |
In this study, carbon nanotubes (CNTs) were heat-treated under an ethylene-argon gas mixture to repair hole defects and improve the nominal tensile strength of CNTs by adsorbing pyrolytic carbon. It was found that the nominal tensile strength of the CNTs exceeded 10 GPa by heat treatment at a temperature of about 700°C and an ethylene partial pressure of 1000 Pa. Furthermore, molecular dynamics simulations were performed to evaluate the relationship between the interlayer crosslinking, the effective tensile strength, and the nominal tensile strength of the CNTs. It was found that the nominal tensile strength exhibited the highest when the proper amount of interlayer crosslinking was introduced to break all layers of the multiwalled CNTs.
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| Free Research Field |
複合材料，材料強度学
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| Academic Significance and Societal Importance of the Research Achievements |
CNTの紡績糸製造技術が開発されて以降，炭素繊維に代わる高強度繊維材料としての適用が期待されているものの，実際に合成した紡績糸の強度は炭素繊維に及んでいない．本研究ではエチレンガスを熱分解した際に発生する熱分解炭素をCNT表面に吸着させることで合成時に内在する欠陥を修復することで強度特性の改善を行った．紡績糸の強度特性改善のためには，CNT同士の結合も必要ではあるものの，CNT単体の構造制御と強度特性改善が重要な要素である．今後，本技術を紡績糸に対して行うことで，熱分解炭素によるCNT間の界面特性の向上も期待され，高強度紡績糸の開発に有益なものになると考えている．
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