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成果報告書詳細
管理番号20190000000190
タイトル*平成30年度中間年報 NEDO先導研究プログラム/エネルギー・環境新技術先導研究プログラム/革新的次世代軽量高強度構造材の研究開発
公開日2019/5/14
報告書年度2018 - 2018
委託先名住友電気工業株式会社 国立大学法人筑波大学
プロジェクト番号P14004
部署名イノベーション推進部
和文要約
英文要約The research goal of this NEDO-project is to clarify the fundamental mechanism for ultra-long and high crystallinity of CNT growth over 2cm long and to demonstrate the high strength of CNT bundle beyond 10 GPa of the braking limit stress.
Here, we demonstrated the CNTs bundles constructing with over 100 long and highly aligned CNT fibers, still maintained the breaking stress up to 40 GPa. We synthesize the long and high crystallinity CNTs using iron-oxide nanoparticles dispersed on the Si/SiO2 substrate as the growth catalyst, and pure methane laminar-flow at 920 to 980 ℃.
The Gas analysis suggested the existence of an iron block in the specimen support effectively suppressed the pyrolysis reaction during CNT growth. Also, the laminar flow of methane effectively assisted the formation of highly aligned CNT bundles. The Raman spectrum Map suggested the free-standing CNTs bridged over a 1mm width slit engraved in the Si/SiO2 substrate, and the D/G rate of the CNT is negligibly small. The typical diameter of the CNT distributed in 1.5 nm to 2.5 nm and consisted of the CNT bundle. We also measure the tensile stress of the CNT bundle using Gas-blow method and nano-mechanical pulling method making up with TiO2 nanobeads decoration for visualizing CNT in an optical microscope. The singe CNT showed 80 to 100 GPa of the breaking stress. While the breaking limit stress decreased with the bundle width, but the thick bundle consisted with about 100 of CNTs still keep 40 GPa.
We also demonstrated the one-step fabrication of CNT fibers using a laboratory-designed thermal chemical vapor deposition (CVD) system. Based on the conventional floating-catalyst CVD method, the presence of gas-rectifiers made of an Al2O3 honeycomb induces the formation of CNT fibers. The fluid analysis suggested the velocity acceleration of the laminar flow passing through in the smalls of the gas-rectifier effectively increased the local share-stress, and thus to contribute to the possible elongation of CNT fibers.
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