Figure 1.

(a) a DWCNT and (b) a CNS with a SWCNT housed inside. Perspective view (left) and end view (right). When displaced from its equilibrium position along axial direction, the inner tube (red) can oscillate inside the outer tube (cyan) or CNS (cyan), at gigahertz of frequency.

Zhang and Li Nanoscale Research Letters 2011 6:470   doi:10.1186/1556-276X-6-470
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