Mechanical elements composed of an individual multiwalled carbon nanotube was fabricated and its mechanical energy dissipation was evaluated in an ultrahigh vacuum. The carbon nanotube was oscillated by applying a voltage between the carbon nanotube and a metal electrode, and its vibration was detected by a laser Doppler vibrometer. Heating in vacuum desorbed contaminants from the carbon nanotube surface and decreased mechanical energy loss. However, the Q factor, i.e., the reciprocal number of the energy loss, was still low (∼800). This result suggests that the dominant energy dissipation relies on the bulk defect of the carbon nanotube.
- Laser Doppler vibrometer
- Mechanical quality factor (Q factor)
- Multiwalled carbon nanotube
- Surface effect
- Ultrahigh vacuum