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Influence of lengths of millimeter-scale single-walled carbon nanotube on electrical and mechanical properties of buckypaper

Shunsuke Sakurai12, Fuminori Kamada1, Don N Futaba12, Motoo Yumura12 and Kenji Hata123*

Author Affiliations

1 Technology Research Association for Single Wall Carbon Nanotubes (TASC), Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan

2 National Institute of Advanced Industrial Science and Technology (AIST), Central 5, 1-1-1, Higashi, Tsukuba, Ibaraki 305-8565, Japan

3 Japan Science and Technology Agency (JST), Honcho 4-1-8, Kawaguchi 332-0012, Japan

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Nanoscale Research Letters 2013, 8:546  doi:10.1186/1556-276X-8-546

Published: 27 December 2013


The electrical conductivity and mechanical strength of carbon nanotube (CNT) buckypaper comprised of millimeter-scale long single-walled CNT (SWCNT) was markedly improved by the use of longer SWCNTs. A series of buckypapers, fabricated from SWCNT forests of varying heights (350, 700, 1,500 μm), showed that both the electrical conductivity (19 to 45 S/cm) and tensile strength (27 to 52 MPa) doubled. These improvements were due to improved transfer of electron and load through a reduced number of junctions for longer SWCNTs. Interestingly, no effects of forest height on the thermal diffusivity of SWCNT buckypapers were observed. Further, these findings provide evidence that the actual SWCNT length in forests is similar to the height.

Carbon nanotube; Buckypaper; Tube length