Abstract
Friction has been recognized and studied for a long time due to its fundamental significance in the processes of human manufacturing and production. However, friction behavior at the nanoscale sometimes violates the conventional classical friction theory. Thickness-dependent friction behavior has been reported in nonpolar van der Waals materials but only within the few-layer range. Here, we report a wide thickness range of thickness-dependent friction behavior in functional van der Waals copper-deficient CuInP2S6 (Cu0.2In1.26P2S6), which exhibits spontaneous phase separation of ferroelectric and paraelectric phases. The friction gradually decreases with the increase of the thickness within the range of 20-230 nm. A higher adhesion force and phononic damping collectively contribute to higher friction in thinner nanoflakes.
Original language | English |
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Pages (from-to) | 19297-19304 |
Number of pages | 8 |
Journal | ACS Applied Nano Materials |
Volume | 7 |
Issue number | 16 |
Early online date | 7 Aug 2024 |
DOIs | |
Publication status | Published - 23 Aug 2024 |
Keywords
- adhesion force
- CuInP2S6
- friction
- phononic damping
- thickness