High-aspect-ratio, 3-D micromachining of carbon-nanotube forests by micro-electro-discharge machining in air

• Main Authors: Dahmardeh, M., Khalid, W., Mohamed Ali, Mohamed Sultan, Choi, Y., Yaghoobi, P., Nojeh, A., Takahata, K.
• Format: Book Section
• Published: IEEE Explorer 2011
• Subjects: TK Electrical engineering. Electronics Nuclear engineering
• Online Access: http://eprints.utm.my/id/eprint/29170/; http://dx.doi.org/10.1109/MEMSYS.2011.5734414

This paper reports micro-electro-discharge machining of vertically aligned carbon nanotube forests for the formation of high-aspect-ratio, three-dimensional microstructures in the material. The developed forest machining method is a dry process performed in air, generating high-frequency pulses of electrical discharge to locally machine the nanotubes in order to create target shapes in a forest. With this approach, forest microstructures can be fabricated to have varying shapes along their height, unachievable with conventional pre-patterned chemical vapor deposition growth techniques. The use of the pulses with a minimized discharge energy defined with 35 V and 10 pF in the discharge generation circuit leads to an aspect ratio of 20 with the smallest feature of 5 µm in forests without disordering the vertical orientation of the nanotubes. Micromachining of multilayer geometries as well as arrayed needle-like microstructures with angled surfaces is demonstrated.