Improvement of mechanical Q-factor towards carbon nanotube resonator through adopting the length of MWCNTs

摘要

This paper presented a method of adopting carbon nanotubes with shorter length as vibrators to obtain higher mechanical quality factor. Two different lengths of MWCNTs were picked up through the van der Waals force between the AFM cantilever surface and MWCNT. The MWCNT was driven by the electrostatic force on its nature frequency. All these experiment were operated through a nanorobotic manipulation system with multiple positioning degrees of freedom (DOFs) inside the SEM specimen chamber. Two group of tests were carried out to obtain the Q values and resonance frequency of these two MWCNTs. We find that the Q values and resonance frequency of the longer MWCNT were higher than the shorter one. The Q values and resonance frequency of the longer CNT whose length is 10.91μm is 10.1 and 89KHz respectively while the Q values and resonance frequency of the shorter CNT whose length is 6.4μm is 69.6 and 985.4KHz.