Individual carbon nanotube soldering with gold nanoink deposition

摘要

A method for soldering carbon nanotubes lying on microfabricated metal pads is presented. By employing the fountain-pen principle, the authors deposited a gold nanoparticle suspension (nanoink) film on the area where the carbon nanotube contacts the metal pad. The nanoink was deposited by using a capillary tube that was pulled into a micropipette with the tip outer diameter of 2 μm. Individual carbon nanotubes were aligned selectively across the electrodes dielectrophoretically. After annealing and sintering of the nanoink pattern the four-point-probe resistance of the carbon nanotubes was measured, resulting in a good Ohmic or near-Ohmic contact (2-15 kΩ).