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Applied Physics Letters / Browse Journal / Volume 93 / Issue 11 / STRUCTURAL, MECHANICAL, THERMODYNAMIC, AND OPTICAL PROPERTIES OF CONDENSED MATTER

Appl. Phys. Lett. 93, 111909 (2008); doi:10.1063/1.2985859 (3 pages)

Self-detecting gate-tunable nanotube paddle resonators

B. Witkamp, M. Poot, H. Pathangi, A. K. Hüttel, and H. S. J. van der Zant

Kavli Institute of Nanoscience, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft, The Netherlands Map This map

(Received 14 May 2008; accepted 27 August 2008; published online 18 September 2008)

We have fabricated suspended metal paddle resonators with carbon nanotubes functioning as self-detecting torsional springs. We observe gate-tunable resonances that either tune to higher or to lower frequencies when increasing the dc voltage on the back gate. We attribute the former modes to flexural vibrations of the paddle resonator, while the latter ones are identified as torsional vibrations. Compared to top-down silicon fabricated paddle resonators, nanotube springs have smaller torsional spring constants and provide a larger frequency tunability.

© 2008 American Institute of Physics

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KEYWORDS and PACS

Keywords

carbon nanotubes, micromechanical resonators, nanotechnology, springs (mechanical), vibrations

PACS

ARTICLE DATA

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http://link.aip.org/link/APPLAB/v93/i11/p111909/s1

PUBLICATION DATA

ISSN:

0003-6951 (print)  
1077-3118 (online)

Publisher:

$abstract.society.value is a Member of CrossRef American Institute of Physics

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  11. See EPAPS Document No. E-APPLAB-93-080837 for detailed analysis of the mode shapes, etc. For more information on EPAPs, see http://www.aip.org/pubservs/epaps.html.
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  14. The effects of (gate tunable) longitudinal strain epsilon on the nanotube lengths are neglected. Longitudinal strain increases the length of each nanotube section and thereby decreases the torsional spring constants, but the effect is too small for the parameters in our study (strain is of the order of 10−6). From the strain, it is therefore a priori not clear if torsional modes tune with gate voltage.
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