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This letter studies the promising application of carbon nanotubes as nanoresonators. Both single- and double-walled carbon nanotubes are considered and the significant difference in the vibration behavior between them has been identified. The individual tube wall is treated as frame-like structures and simulated by the molecular-structural-mechanics method. The interlayer van der Waals interactions are represented by Lennard–Jones potential and simulated by a nonlinear truss rod model. The results show that fundamental frequencies of double-walled carbon nanotubes are about 10% lower than those of single-walled carbon nanotubes of the same outer diameter. The noncoaxial vibration of double-walled nanotubes begins at the third resonant frequency and does not significantly diminish the value of double-walled nanotubes as high-frequency nanoresonators.

The potential of nanobalances based on individual single-walled carbon nanotubes is examined. The carbon nanotube resonators are assumed to be either cantilevered or bridged and simulated by an atomistic modeling, i.e., the molecular structural mechanics method. The results indicate that the mass sensitivity of carbon nanotube nanobalances can reach 10 −21 g and a logarithmically linear relationship exists between the resonant frequency and the attached mass when the mass is larger than 10 −20 g. The sensitivity of resonant frequency shifts to both tube length and diameter has been demonstrated.