Abstract
A simple ultrasonic nanowelding technique has been developed to reliably bond single-wallcarbon nanotubes (SWCNTs) onto metal electrodes, by pressing SWCNTs againstelectrodes under a vibrating force at ultrasonic frequency. The bonds formed have beendemonstrated to be mechanically robust. Using this technique, a stable low-Ohmic contactbetween SWCNTs and metal electrodes was achieved, with resistances in the range of8–24 kΩ fora 1 µm long metallic SWCNT at room temperature. The performance of carbonnanotube field-effect transistors (FETs) fabricated using this ultrasonicnanowelding method has also been greatly improved. Transconductance as high as3.6 µS among the solid-state back-gate individual nanotube FETs has been achieved.
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