Effects of compressive strains on electrical conductivities of a macroscale carbon nanotube block

Victor L. Pushparaj, Lijie Ci, Subbalakshmi Sreekala, Ashavani Kumar, Sai Kesapragada, Daniel Gall, Omkaram Nalamasu, Ajayan M. Pulickel, Jonghwan Suhr
2007 Applied Physics Letters  
A macroscopic block ͑ϳ9 mm 3 ͒ of aligned carbon nanotubes ͑CNTs͒ was grown by chemical vapor deposition and its simultaneous electrical conductivity and compressive strain responses were measured parallel and perpendicular to the CNT alignment. The block exhibits elastic moduli of 0.9 and 1.6 MPa for compressive strain of Ͻ20% in parallel and perpendicular configurations, respectively. The electrical conductivity increases with increasing compressive strain in both configurations. The
more » ... e electrical conductivity and compressive strain responses of block is attributed to elastic bending of CNTs. These excellent properties of CNT block can be used in compressive strain sensing applications.
doi:10.1063/1.2798599 fatcat:vlnlgo2sqfb7fb27cany6vgywi