Scientists in Spain have developed a new type of carbon nanotube fiber that may reshape the future of electrical wiring.
The material delivers conductivity levels close to copper while weighing far less than traditional metal conductors.
The findings were published in the journal Science and are drawing attention across the aerospace and electrification sectors.
The research was led by the IMDEA Materials Institute in collaboration with the Technical University of Madrid and the University of Zaragoza.
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Scientists focused on improving the performance of carbon nanotube(CNT) fibers for industrial use. Their goal was to create lightweight conductors that can carry electricity efficiently without sacrificing strength.
Why Carbon Nanotube Fibers Matter
Copper has remained the standard material for electrical wiring for decades because of its excellent conductivity. However, copper is heavy, and that weight becomes a major challenge in industries such as aviation, electric mobility, and drone manufacturing. Engineers have been searching for lighter materials that can maintain similar electrical performance.
Carbon nanotubes are microscopic cylindrical structures made from carbon atoms. They are known for being extremely light, mechanically strong, and thermally stable. Scientists have long believed CNTs could replace traditional conductors, but previous versions lacked the conductivity needed for large-scale commercial applications.
The Spanish research team addressed this issue by improving the internal structure of CNT fibers. They introduced a chemical compound, tetrachloroaluminate (AlCl₄⁻), into highly aligned nanotube bundles. This process increased conductivity while preserving the fibers’ original strength and flexibility.
Researchers said the new fibers reached electrical conductivity levels of 24.5 MegaSiemens per meter at room temperature. That is nearly half the conductivity of copper but with a major weight advantage. The CNT fibers are about six times lighter than copper conductors with similar performance targets.
The team explained that lighter conductors can improve efficiency in electric transport systems. In aircraft and drones, reducing cable weight can help extend operating range and lower energy consumption. In electric vehicles, lighter wiring may improve battery efficiency and overall vehicle performance.
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How CNT Doping Process Improved Conductivity
The key advance came from a gas-phase intercalation method developed by the researchers. In simple terms, the team inserted AlCl₄⁻ molecules between the nanotube structures without disrupting the fiber arrangement. This allowed electricity to move more efficiently through the material.
Lead researcher Ana Inés de Isidro Gómez said the chemical dopant produced a strong conductivity effect without adding much extra weight. That balance is important because many earlier conductivity-enhancing methods increased mass or weakened the material. The researchers reported that conductivity improved more than 17 times after the doping process.
Scientists also measured the material’s specific conductivity, which compares electrical performance relative to weight. In this category, the CNT fibers exceeded copper and even surpassed aluminum in some tests. That result is significant because aluminum is already widely used as a lightweight conductor in power systems and transportation.
The research team also highlighted the mechanical strength of the new fibers. According to the study, the CNT conductors are five times stronger than conventional overhead power cables while weighing roughly half as much. This combination of strength and low weight may reduce structural stress in large electrical networks.
Researchers used advanced microscopy tools to study the material at the nanoscale level. The work involved scientists from the Institute of Nanoscience and Materials of Aragon and the Advanced Microscopy Laboratory in Spain. Their analysis confirmed that the nanotube structure remained highly ordered after the chemical treatment.
Impact on EVs, Aircraft and Energy Networks
The timing of the development is important as industries push toward electrification. Electric vehicles, urban air mobility systems, and next-generation drones all require lightweight electrical components. Heavy wiring adds unnecessary weight, directly affecting energy efficiency and operating costs.
Aircraft manufacturers are also increasing investment in electric and hybrid propulsion systems. In aviation, even small reductions in weight can produce major fuel and efficiency gains over time. Lighter electrical systems may therefore become a critical part of future aircraft design.
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The technology may also benefit national power infrastructure. Overhead transmission lines often face limitations because their weight can cause mechanical strain over long distances. Stronger, lighter CNT cables could improve power delivery while reducing structural demands on towers and support systems.
Researchers believe the manufacturing method is scalable for industrial production. That is a major factor because many laboratory materials fail to move into commercial use due to high costs or production difficulties. The study suggests that the CNT fibers can now meet important industrial performance standards.
Scientists said further improvements may still be possible with additional refinement of the intercalation process. The team plans to continue exploring ways to increase conductivity while maintaining low weight and high durability.
If development continues at the current pace, CNT-based conductors may begin appearing in future transport systems and energy networks within the coming years.
