Their recent study, published on Nature magazine’s open-access Scientific Reports, sought to show that cables made of double-walled carbon nanotubes could be used to power a fluorescent light bulb at standard line voltage. To increase the conductivity of the cables, the team doped them with iodine (passing the one initial test when the cables remained stable).
They found that the conductivity-to-weight ratio (called specific conductivity) of these new carbon nanotubes beats most metals used to conduct electricity, including copper and silver, and places second only to the metal with highest specific conductivity, sodium.
The study’s lead author, Yao Zhao, left the bulb in the research lab burning for days, with no evidence of degradation in the nanotube cable. He and his colleagues believe that such technology may find widespread use first in applications where weight is a critical factor, such as airplanes and automobiles, but further in the future might even replace traditional wiring in homes.