Abstract
We demonstrate a negative Poisson's ratio in carbon nanotube forest devices subjected to extension motion obtained by means of electrostatic actuation. Actuated devices were optically monitored, while electrostatic force was applied and the axial (parallel to the carbon nanotubes) and lateral (perpendicular to the carbon nanotubes) motions were extracted. Poisson's ratios were then calculated for the top, middle and bottom portions of the carbon nanotube forest devices. Since extension motion is associated with morphology change of enhancement of carbon nanotube alignment, negative Poisson's ratios were obtained. Large negative Poisson's ratios were obtained in the top portion (where morphology change is most significant), while other portions (where morphology change is less significant) demonstrated smaller value of negative Poisson's ratio. This property makes carbon nanotube forest attractive material for building of micro-electromechanical devices with versatile motion transformation.
Published Version
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