A New Directly Placement Method For Individual Carbon Nanotube Devices And Its Applications To The Nanomechanical Resonators*

Though carbon nanotube (CNT) is acknowledged as an ideal system for one-dimensional physics, making ultraclean nanotubes with electrical circuits of arbitrary complexity is still a challenge. We develop a new directly deterministic placement technique that allows us to operate each CNT under an optical microscope and ambient conditions. For an individual ultralong few walled CNT, after deposit nanoparticles on the suspended part of it for visualization, we draw the inner shell of the CNT, and transfer it between the two homemade tips, then place it to the target placement on the device chip. The CNTs transferred are perfect clean since they are inner shell of the CNTs and not suffer from any wet process. The way to transfer and placement is so flexible and steerable that the construction of complex multi-nanotube devices can be allowed. Using this technique, we fabricate the CNT electromechanical resonators and study the different types of coupling effects, including the Rabi oscillation of the coherent phonon between the coupling modes and the nonlocal coupling of phonon. Further, we realized the stressed CNT devices for high tunability, high quality factor, single mode GHz resonators.