Journal
SMALL
Volume -, Issue -, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.202308571
Keywords
axial tensile strain; BNNTs; heterostructure nanotubes; raman spectroscopy; SWCNTs; thermal conductivity
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Thermal conductivity of a suspended single-walled carbon nanotube (SWCNT) is significantly enhanced by introducing an axial tensile strain, and the enhancement is positively correlated with the strain magnitude. Furthermore, the reduction of thermal conductivity with temperature is alleviated for the strained nanotube compared to unstrained cases.
Thermal conductivity measurements are conducted by optothermal Raman technique before and after the introduction of an axial tensile strain in a suspended single-walled carbon nanotube (SWCNT) through end-anchoring by boron nitride nanotubes (BNNTs). Surprisingly, the axial tensile strain (<0.4 %) in SWCNT results in a considerable enhancement of its thermal conductivity, and the larger the strain, the higher the enhancement. Furthermore, the thermal conductivity reduction with temperature is much alleviated for the strained nanotube compared to previously reported unstrained cases. The thermal conductivity of SWCNT increases with its length is also observed.
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