Novel resistance behavior of single-walled carbon nanotubes under large currents.
The resistance of single-walled carbon nanotube (SWNT) bundles has been investigated by two-terminal measurements. We find that the time dependence of resistance (dR/dt) exhibits different behaviors at different currents. At low currents, a positive dR/dt is observed. However, dR/dt shows a negative sign when the applied current exceeds a critical current (Ic). Ic coincides with the current when the sample begins to emit light. The variation of dR/dt can be interpreted as the thermal effects owing to Joule heating in the SWNTs. Our lighting SWNTs sample has a small change in resistance and exhibits high stability.
National Center for Nanoscience and Technology of China, Beijing 100080, China.
Guangtong
G
Liu
Zheng
Z
Liu
Yuanchun
Y
Zhao
Wenjun
W
Ma
Kaihong
K
Zheng
Haibo
H
Huang
Lianfeng
L
Sun
Sishen
S
Xie