Mechanism of resistivity decrease in networked-nanographite wires for multi-layer graphene interconnects

We investigated the mechanism of resistivity decrease in networked-nanographite wires. The wires had no failure during over 200 hours under a current density of 5E5A/cm
²
at about 400°C. However, their resistivity decreased gradually owing to thermal stress. Raman and x-ray photoelectron spectroscopy revealed that the decrease in resistivity can be attributed to an increase in sp
²
bonding corresponding to the formation of a graphene sheet. It is important to clarify the mechanism for the decrease in resistivity, not only to improve thermal stability but also to obtain lower resistivity in carbon interconnects.