Why are carbon nanotubes nearing copper conductivity?
Carbon nanotubes closing in on copper for wiring
Carbon nanotubes (CNTs) have long been pitched as next-generation conductors because they can be engineered to behave like metals and can be manufactured at small scales. But turning that promise into real-world performance—especially compared with copper—has been difficult. New work described in the science coverage highlights progress in reducing the performance gap, bringing CNTs closer to copper-like conductivity.
The improvement matters because electrical wiring is a foundational bottleneck for electronics: lower resistance means less wasted energy as heat, better battery life for mobile devices, and improved efficiency for data centers and high-performance computing. Copper remains the standard because it combines high conductivity with mature manufacturing and reliability.
What’s changing
The coverage frames the advance as a narrowing of the “extreme hype” gap by focusing on more practical progress in CNT-based conductors and wiring approaches. While CNTs are naturally conductive, performance depends strongly on factors like: - Tube alignment and junction quality (contacts between tubes can dominate losses) - Purity and defect levels (scattering reduces conductivity) - Manufacturing integration (how well CNT layers can be patterned and scaled)
As researchers improve these elements, CNT networks and CNT-based films can deliver higher effective conductivity, making them more plausible for replacing copper in certain applications—particularly where nanoscale flexibility, weight, or novel device architectures are valuable.
Why it matters now
- Potential for new form factors: CNT materials could enable conductors where copper is difficult to use.
- Efficiency gains: If conductivity becomes competitive, power losses can drop.
- Tech transition: The shift from “lab wonder material” toward scalable wiring is the real milestone.
The reporting emphasizes that CNTs are still competing against copper’s well-established combination of electrical performance and manufacturing practicality, but the trajectory is getting more serious as the gap shrinks.