Carbon nanotube forest devices with negative poisson's ratio

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review


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.

Original languageEnglish
Title of host publicationIEEE Sensors, SENSORS 2016 - Proceedings
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781479982875
StatePublished - 5 Jan 2017
Event15th IEEE Sensors Conference, SENSORS 2016 - Orlando, United States
Duration: 30 Oct 20162 Nov 2016

Publication series

NameProceedings of IEEE Sensors
ISSN (Print)1930-0395
ISSN (Electronic)2168-9229


Conference15th IEEE Sensors Conference, SENSORS 2016
Country/TerritoryUnited States


  • carbon nanotube forests
  • electrostatic actuation
  • motion transformation
  • negative Poisson's ratio


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