Quartz Tuning-Fork Based Carbon Nanotube Transfer into Quantum Device Geometries

With the objective of integrating single clean, as-grown carbon nanotubes into complex circuits, we have developed a technique to grow nanotubes directly on commercially available quartz tuning forks using a high-temperature chemical vapor deposition process. Multiple straight and aligned nanotubes bridge the >100 mu m gap between the two tips. The nanotubes are then lowered onto contact electrodes, electronically characterized in situ, and subsequently cut loose from the tuning fork using a high current. First quantum transport measurements of the resulting devices at cryogenic temperatures display Coulomb blockade characteristics.