Electrically Stable Carbon Nanotube Yarn Under Tensile Strain

We report a highly stable electrical conductance of a compact and well-oriented carbon nanotube yarn under tensile strain. The gauge factor of the yarn was found to be extremely small of approximately 0.15 thanks to the improvements in the dry spinning process, including multiweb spinning and heat treatment. The threshold strain ε
_s
, below which the yarn retains its electrical conductance stability, has also been determined to be approximately 15 × 10
³
ppm. Owing to its highly stable resistance under mechanical strain, the yarn has a good potential as a wiring material for niche applications, where light weight and resistance stability are required.