Study on Piezoresistive of Doped Carbon Nanotube Films
The piezoresistive effect in iodine-doped carbon nanotube films was investigated by a three-point bending test. Carbon nanotubes were synthesized by hot filament chemical vapor deposition. The experimental results showed that the gauge factor for I-doped and undoped carbon nanotube films under 500 microstrain was about 350 and 65 respectively at room temperature, exceeding that of polycrystalline silicon (30) at 35°C. The origin of the piezoresistivity in the films may be ascribed to a strain-induced change in the band gap for the doped tubes and the intertube contact resistance and defects for the undoped tubes.
M. Gupta and Christina Y.H. Lim
W.L. Wang et al., "Study on Piezoresistive of Doped Carbon Nanotube Films", Journal of Metastable and Nanocrystalline Materials, Vol. 23, pp. 309-312, 2005