Anisotropic buckling of few-layer black phosphorus

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Abstract

When a two-dimensional material, adhered onto a compliant substrate, is subjected to compression it can undergo a buckling instability yielding to a periodic rippling. Interestingly, when black phosphorus (bP) flakes are compressed along the zig-zag crystal direction, the flake buckles forming ripples with a 40% longer period than that obtained when the compression is applied along the armchair direction. This anisotropic buckling stems from the puckered honeycomb crystal structure of bP and a quantitative analysis of the ripple period allows the determination of the Youngs's modulus of few-layer bP along the armchair direction (EbP-AC = 35.1 ± 6.3 GPa) and the zig-zag direction (EbP-ZZ = 93.3 ± 21.8 GPa).

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Vaquero-Garzon, L., Frisenda, R., & Castellanos-Gomez, A. (2019). Anisotropic buckling of few-layer black phosphorus. Nanoscale, 11(25), 12080–12086. https://doi.org/10.1039/c9nr03009c

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