Clamping and Q-Factor Improvement in a Carbon Nanotube Resonator

This work reports the clamping effects on the performance of a carbon nanotube basednanoresonator. A direct comparison of two different nanotube-clamping geometries on the samenanotube device is presented. The nanotube was mechanically dry transferred and clamped throughvan-der-Waals forces onto palladium electrodes resulting in a bottom clamped configuration. A 20nm platinum layer was then selectively deposited on the electrodes through atomic layerdeposition resulting in top-bottom clamped configuration. With top clamping, a Q-factor increaseof 1.5~2× has been observed accompanied by a decrease in the resonance frequency.