Researchers have developed a torque-driven molecular machine that achieves perfect unidirectional rotation using electric current, with conductance increasing significantly during motion, according to a study published in Nature.
A team of scientists created a molecular machine that uses electric current to drive unidirectional rotation. The device achieves 100% directional preference and boosts electrical conductance during movement. It suspends a helicene molecule between two electrode tips, where voltage triggers cyclic motion. Current increases sharply above a voltage threshold. The effect changes when the helical structure stretches or compresses. The research, by Marek, Š., Camarasa-Gómez, M., and Korytár, R., is archived on Zenodo with identifiers 10.5281/zenodo.20846643 and 10.5281/zenodo.21281784.
Force Drives Molecular Rotation
Calculations show current-induced forces cause rotation. They predict motion shifts from stepwise to continuous at a voltage threshold. The team says structural and operational differences explain these changes. Citations [4–6] from the study support this.
Previous studies, like the 2016 ACS Nano paper by Saywell, A. et al., showed light-induced movement of motorized molecules. The 2023 Nature study by Mishra, P. et al. examined current-driven supramolecular motors with chiral directionality. These works set the stage for the 2026 breakthrough. It combines helical structures with electric current to achieve unidirectional rotation. The helicene molecule’s suspension between electrode tips allows precise control over motion, as noted in the Zenodo data archive.
Motion Boosts Electrical Flow
The device shows motion boosts electrical current. Researchers say this differs from rotation-modulated conductance, where movement alters but doesn’t necessarily increase signal strength. The study says molecular rotation can reshape electron transport. Conductance reveals and may control movement. Independent verification needs vibrational signatures, surface imaging, or computational models to confirm orientation changes, as in Source 3.
The research introduces a prototype for torque-driven molecular machines with unidirectional rotors. A significance score of 4.4% places this in the top 4.4% of 33,115 analyzed articles. The study’s authors, including Marek, Š., Camarasa-Gómez, M., and Korytár, R., say the device could advance molecular electronics and nanoscale engineering.
Engineering New Possibilities
The breakthrough could shape nanoscale engineering by merging classical mechanics with molecular design. The single-molecule Archimedes’ screw in the study shows how helical structures turn rotation into directional transport. Commercial use remains in research. Challenges include reproducible fabrication, stable operation, and integration with larger systems, as in Source 5.
Key issues include separating real molecular rotation from thermal motion and electrical noise. Researchers stress the need for structural evidence and control experiments. The work moves toward molecular machines that could change nanotechnology. Practical use faces hurdles in scalability and reliability. The authors say current-driven machines must work under less strict conditions to move from labs to real-world applications.
The research team’s work follows earlier studies on molecular dynamics and nanomechanical systems.
The study’s method suspends a helicene molecule between electrode tips. This setup lets researchers measure current and rotation. The device’s voltage threshold for conductance changes through mechanical adjustments. This tunability, plus 100% directional preference, makes it a prototype for future torque-driven machines. Computational models in the Zenodo archive link current forces to rotation.
The study admits limits in current molecular machine tech. Commercial use needs solutions for reproducible fabrication, stable operation, and low energy loss, as in Source 5. The team says most molecular machines remain in research. Integration into larger systems is still developing. Independent structural evidence and control experiments are vital for validating performance, as the study notes.
The 2026 Nature study marks a key step in molecular electronics. It offers a new way to design torque-driven nanoscale devices. Using helical structures and electric current, the research opens paths for molecular sensing, data storage, and energy conversion. Its mix of classical mechanics and molecular engineering reflects trends in nanotechnology. As the field grows, further studies will likely refine these ideas, pushing torque-driven machines closer to real-world use.