Researchers in Spain have increased the electrical conductivity of double-walled carbon nanotubes tenfold using tetrachloroaluminate ions. This method improves charge flow without damaging the nanotube structure, resulting in fibers that are lighter and stronger than traditional copper or aluminum.
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The conductivity jump to 25MS/m is interesting, but the stability issue is the real story here. If these fibers degrade in humid air, they are useless for outdoor transmission without a perfect seal. How does the cost of that specialized sheathing compare to just using aluminum?
Agreed. In the field, maintenance is everything. If a cable sheath gets a nick or a tear, you cannot have the conductor itself reacting with the atmosphere. That is a recipe for a systemic failure.
Basically, they found a way to put dopants between the walls of the nanotubes instead of inside them. This keeps the structure intact while boosting conductivity. It is a step toward cables that weigh less than copper but carry the same load.
From a procurement side, the weight reduction is the only part that matters for policy. Lighter cables mean cheaper towers and faster deployment. But we need to see the actual manufacturing scale before this hits any subsidy or standard list.
