Abstract
Strain and interface engineering has made significant progress in modulating the friction properties of atomically thin two-dimensional materials, especially in ultra-low friction. Here, it is demonstrated that ultra-low friction of atomically thin suspended h-BN is feasible on the bubble magnitude by the biased tip using atomic force microscopy (AFM). The degree of ultra-low friction decreases with the diameter of the bubbles. A prominent upward shift of the contact potential difference (CPD) was observed using SKPM in the atomically thin suspended bubbleless h-BN due to strain gradients, while the reverse downward shift of CPD on the atomically thin suspended h-BN bubble was figured out. The strain gradient induces a reverse flexoelectric voltage on both sides of the atomically thin suspended h-BN bubble. The Coulomb attraction between the bubble and the tip, along with the interlayer repulsion, collectively contribute to interlayer friction, ultimately leading to the achievement of superlubricity. Our work combines flexoelectricity with interlayer engineering to achieve a novel two-dimensional material superlubric structure.
Published Version
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