Fabrication and Characterization of MWCNT-Based Bridge Devices

Karumbaiah Chappanda Nanaiah, Nitin M Batra, Jorge Alberto Holguin Lerma, Pedro M. F. J. Da Costa, Mohammad I. Younis

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

Carbon nanotubes (CNTs) are one of the most actively researched structural materials due to their interesting electrical, mechanical, and chemical properties. Unlike single walled carbon nanotubes (SWCNTs), little work has been focused on multi-walled carbon nanotubes (MWCNTs) and their potential for practical devices. Here, we have fabricated bridge-shape devices integrating MWCNTs (> 50 nm in outer diameter) using three processes: optical lithography, electron beam-induced platinum deposition, and surface micromachining. Each device consists of a doubly-clamped nanotube suspended over gold electrodes on a highly conductive Si substrate. The suspended nanotubes are characterized individually using Raman spectroscopy and semiconductor parameters analysis and, overall, show, high crystallinity and low electrical resistance. The spring constants of doubly-clamped nanotubes were characterized using atomic force microscopy force-displacement measurements, with values as high as 70 N/m observed. Highly stiff MWCNTs are promising for a variety of applications, such as resonators and electrical interconnects. Through simulations, we estimate the resonance frequencies and pull-in voltages of these suspended nano-structures. The dependence of key parameters, such as the nanotube's length, Young's modulus, axial stress, and wall thickness is also discussed.
Original languageEnglish (US)
Pages (from-to)1037-1046
Number of pages10
JournalIEEE Transactions on Nanotechnology
Volume16
Issue number6
DOIs
StatePublished - Aug 21 2017

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