QUT Researchers Develop Molecular Strategy to Boost Carbon Nanotube Performance

For over two decades, the potential of carbon nanotubes—microscopic, flexible, and electrically conductive rods—has been hampered by a persistent physical problem: their tendency to aggregate. When these nanotubes clump together, their performance in thermoelectric applications drops sharply, limiting their use in next-generation wearable technology. A research team at the QUT School of Chemistry and Physics has now bypassed this hurdle with a new molecular design.

Molecular Strategy to Prevent Nanotube Aggregation

The team, led by PhD researcher Mrs. Shanshan Zhou, shifted focus away from traditional methods of improving nanotubes. Instead of refining existing techniques, they engineered a new way to ensure the nanotubes remain dispersed.

Professor Zhi-Gang Chen, Director of the ARC Research Hub in Zero-Emission Power Generation for Carbon Neutrality, explained that the team’s design fundamentally alters how these materials interact at the molecular level. By utilizing specially designed molecules to maintain separation, the researchers are able to prevent clumping without hindering the nanotubes’ inherent electrical conductivity.

Real-World Testing and Future Wearable Applications

To confirm the material’s viability, the researchers integrated it into a flexible device designed to harvest electricity from body heat. According to the team, the device demonstrated durability during extensive bending and folding tests, suggesting that the technology is robust enough for practical, everyday use.

Beyond immediate wearable applications, the researchers anticipate that this technology could be scaled for use in industrial waste heat recovery, the Internet of Things, and various flexible sensors. The project is part of a broader research initiative at QUT aimed at advancing zero-emission energy technologies and sustainable power systems.

Research Context and Team Contributions

The study, titled Radical-Mediated Dispersion Breaks Aggregation Limits in Carbon Thermoelectrics, was supported by the Australian Research Council and QUT’s Capacity Building Professor Program. The collaborative team included researchers from the QUT School of Chemistry and Physics and the Centre for Materials Science, specifically Shanshan Zhou, Dr. Xiao-Lei Shi, Dr. Meng Li, Dr. Wenyi Chen, Dr. Tianyi Cao, Nan-Hai Li, Dr. Min Zhang, Professor Prashant Sonar, Dr. Qian Liu, and Professor Zhi-Gang Chen.

For instance, researchers have utilized nanometer-sized coherent electron beams to achieve atomic-resolution imaging of carbon nanotubes, a technique that allows scientists to solve the phase problem through oversampling and iterative phase retrieval. These developments in imaging provide complementary insights into the structural characteristics of nanostructures.

Sources: science.org.