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Self-Healing in Carbon Nitride Evidenced As Material Inflation and Superlubric Behavior
- Bakoglidis, Konstantinos D., Palisaitis, Justinas, dos Santos, Renato B., Rivelino, Roberto, Persson, Per O.Å., Gueorguiev, Gueorgui K., Hultman, Lars
- ACS applied materials & interfaces 2018 v.10 no.19 pp. 16238-16243
- carbon nitride, chemical bonding, desorption, friction, lubricants, magnetism, materials science, nitrogen
- All known materials wear under extended mechanical contacting. Superlubricity may present solutions, but is an expressed mystery in C-based materials. We report negative wear of carbon nitride films; a wear-less condition with mechanically induced material inflation at the nanoscale and friction coefficient approaching ultralow values (0.06). Superlubricity in carbon nitride is expressed as C–N bond breaking for reduced coupling between graphitic-like sheets and eventual N₂ desorption. The transforming surface layer acts as a solid lubricant, whereas the film bulk retains its high elasticity. The present findings offer new means for materials design at the atomic level, and for property optimization in wear-critical applications like magnetic reading devices or nanomachines.