Letter abstract

Nature Materials 7, 459 - 463 (2008)
Published online: 20 April 2008 | doi:10.1038/nmat2181

Subject Categories: Composites | Mechanical properties | Nanoscale materials

High-frequency micromechanical resonators from aluminium–carbon nanotube nanolaminates

Jung Hoon Bak1,1, Young Duck Kim1,1, Seung Sae Hong1, Byung Yang Lee1, Seung Ran Lee1, Jae Hyuck Jang2, Miyoung Kim2, Kookrin Char1, Seunghun Hong1 & Yun Daniel Park1


At micro- and nanoscales, materials with high Young's moduli and low densities are of great interest for high-frequency micromechanical resonator devices1, 2, 3, 4, 5, 6, 7, 8. Incorporating carbon nanotubes (CNTs), with their unmatched properties, has added functionality to many man-made composites9, 10, 11. We report on the fabrication of less than or equal to100-nm-thick laminates by sputter-deposition of aluminium onto a two-dimensional single-walled CNT network12, 13. These nanolaminates—composed of Al, its native oxide Al2O3 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 matrix14.

  1. Department of Physics and Astronomy, Seoul National University, Seoul 151-747, Korea
  2. Department of Materials Science and Engineering, Seoul National University, Seoul 151-744, Korea
  3. These authors contributed equally to this work

Correspondence to: Seung Sae Hong1 Current address: Department of Applied Physics, Stanford University, Stanford, California 94305-4090, USA

Correspondence to: Yun Daniel Park1 e-mail: parkyd@phya.snu.ac.kr


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