Controlling resonance frequencies of double-walled carbon-nanotube oscillators with divided outertubes

We investigated the resonance frequency distributions of carbon nanotube (CNT) oscillators with an intertube gap using molecular dynamics simulations. The resonance frequency distributions could be regressed by the use of Gaussian distributions. The maximum resonance frequencies linearly decreased with increasing initial velocity of the coretube. For the same initial velocity of the coretube, the maximum resonance frequencies were constant regardless of gap spacing changes, and the center positions of the Gaussian distributions were shifted by changing the outertube length whereas their standard deviations were not changed. Although their standard deviations were influenced by the initial velocity of the coretube, the normalized resonance frequencies could be regressed into single Gaussian distribution within some error. So considering the difficulty of exactly controlling of the initial velocity, the resonance frequency distribution predicted by the gap spacing can give important revolution for CNT-oscillators to be utilized as components of nanoelectromechanical system.