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Self-assembled switches based on electroactuated multiwalled nanotubes
1.M. Roukes, Phys. World 14, 25 (2001).
7.S. W. Lee, D. S. Lee, R. E. Morjan, S. H. Jhang, M. Sveningsson, O. A. Nerushev, Y. W. Park, and E. E. B. Campbell, Nano Lett. 4, 2027 (2004).
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13.The accuracy in the trench etching (rate of ) and in the metal evaporation (rate of ) ensure that the process is highly reproducible. We estimate our precision in the final tube-bottom electrode separation to be approximately .
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16.MWNT suspensions were obtained by sonicating of purified samples in of N-methylpyrolidone for . The remaining aggregated nanotubes were removed by centrifugating the suspension ( for ). The supernatant was collected and resonicated at low power for .
17.The apparent saturation of the current in Fig. 3 is only due to the saturation of the current amplifier, the gain of which is kept at a high value to maintain a good accuracy in the measurement of the low-current part of the curve.
18.Modifications of SAMs on gold by an intense and local electric field has been widely studied by STM. See, e.g., C. B. Gorman, R. L. Carroll, Y. He, F. Tian, and R. Fuierer, Langmuir 16, 6312 (2000) and references therein.
19.The bandwidth of the current amplifier makes it difficult to distinguished the proposed pull-in mechanism from a rapidly varying current resulting from tunneling through a barrier of decreasing width. Both mechanisms involve the mechanical displacement of the nanotube and result in sharp switching, even though, pull-in characteristics are much sharper. However, calculations of the tunneling mechanism using reasonable geometrical parameters and barrier heights are unable to match the observed abruptness of the switching event, which strongly favors the pull-in picture.
20.H. J. Hwang and J. W. Kang, Phys. Fluids 27, 163 (2005).
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