Overview
- Researchers report in Nature Communications that tuning the thickness of ruthenium dioxide on titanium dioxide changes the metal’s surface work function by more than 1 electron volt.
- The shift is strongest near 4 nanometers, where the film relaxes from a stretched state and the change in atomic packing drives the electronic response.
- Atomic-scale imaging revealed tiny polar displacements at the boundary and the team linked those structural changes directly to electronic measurements.
- Work function is the energy needed for electrons to leave a surface, so a 1 eV change can alter charge transfer, catalytic performance, and how devices turn on and off.
- The study involved the University of Minnesota, MIT, Texas A&M, and Gwangju Institute of Science and Technology with U.S. Department of Energy and Air Force funding, and any device integration remains a future step.