title: High-frequency micromechanical resonators from aluminium-carbon nanotube nanolaminates.
abstract: At micro- and nanoscales, materials with high Young's moduli and low densities are of great interest for high-frequency micromechanical resonator devices. Incorporating carbon nanotubes (CNTs), with their unmatched properties, has added functionality to many man-made composites. We report on the fabrication of < or = 100-nm-thick laminates by sputter-deposition of aluminium onto a two-dimensional single-walled CNT network. These nanolaminates--composed of Al, its native oxide Al(2)O(3) and CNTs--are fashioned, in a scalable manner, into suspended doubly clamped micromechanical beams. Dynamic flexural measurements show marked increases in resonant frequencies for nanolaminates with Al-CNT laminae. Such increases, further supported by quasi-static flexural measurements, are partly attributable to enhancements in elastic properties arising from the addition of CNTs. As a consequence, these nanolaminate micromechanical resonators show significant suppression of mechanical nonlinearity and enhanced strength, both of which are advantageous for practical applications and analogous to biological nanocomposites, similarly composed of high-aspect-ratio, mechanically superior mineral platelets in a soft protein matrix.
authors.affiliation: Department of Physics and Astronomy, Seoul National University, Seoul 151-747, Korea.
authors.forename: Jung Hoon
authors.initials: JH
authors.lastname: Bak
authors.forename: Young Duck
authors.initials: YD
authors.lastname: Kim
authors.forename: Seung Sae
authors.initials: SS
authors.lastname: Hong
authors.forename: Byung Yang
authors.initials: BY
authors.lastname: Lee
authors.forename: Seung Ran
authors.initials: SR
authors.lastname: Lee
authors.forename: Jae Hyuck
authors.initials: JH
authors.lastname: Jang
authors.forename: Miyoung
authors.initials: M
authors.lastname: Kim
authors.forename: Kookrin
authors.initials: K
authors.lastname: Char
authors.forename: Seunghun
authors.initials: S
authors.lastname: Hong
authors.forename: Yun Daniel
authors.initials: YD
authors.lastname: Park
mesh_terms: D000535:Aluminum / Q000737:chemistry*; D037742:Nanotubes, Carbon
chemical_list: D037742:Nanotubes, Carbon; D000535:Aluminum