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Barboza AP, Chacham H, Oliveira CK, et al. Dynamic negative compressibility of few-layer graphene, h-BN, and MoS2. Nano Lett. 2012;12(5):2313-7doi: 10.1021/nl300183e.
Barboza, A. P., Chacham, H., Oliveira, C. K., Fernandes, T. F., Ferreira, E. H., Archanjo, B. S., Batista, R. J., de Oliveira, A. B., & Neves, B. R. (2012). Dynamic negative compressibility of few-layer graphene, h-BN, and MoS2. Nano letters, 12(5), 2313-7. https://doi.org/10.1021/nl300183e
Barboza, Ana Paula M, et al. "Dynamic negative compressibility of few-layer graphene, h-BN, and MoS2." Nano letters vol. 12,5 (2012): 2313-7. doi: https://doi.org/10.1021/nl300183e
Barboza AP, Chacham H, Oliveira CK, Fernandes TF, Ferreira EH, Archanjo BS, Batista RJ, de Oliveira AB, Neves BR. Dynamic negative compressibility of few-layer graphene, h-BN, and MoS2. Nano Lett. 2012 May 09;12(5):2313-7. doi: 10.1021/nl300183e. Epub 2012 Apr 10. PMID: 22468807.
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Nano Lett. 2012 May 09;12(5):2313-7. doi: 10.1021/nl300183e. Epub 2012 Apr 10.

Dynamic negative compressibility of few-layer graphene, h-BN, and MoS2.

Nano letters

Ana Paula M Barboza, Helio Chacham, Camilla K Oliveira, Thales F D Fernandes, Erlon H Martins Ferreira, Braulio S Archanjo, Ronaldo J C Batista, Alan B de Oliveira, Bernardo R A Neves

Affiliations

  1. Departamento de Física, ICEx, Universidade Federal de Minas Gerais (UFMG), CP 702, 30123-970 Belo Horizonte, Brazil.

PMID: 22468807 DOI: 10.1021/nl300183e

Abstract

We report a novel mechanical response of few-layer graphene, h-BN, and MoS(2) to the simultaneous compression and shear by an atomic force microscope (AFM) tip. The response is characterized by the vertical expansion of these two-dimensional (2D) layered materials upon compression. Such effect is proportional to the applied load, leading to vertical strain values (opposite to the applied force) of up to 150%. The effect is null in the absence of shear, increases with tip velocity, and is anisotropic. It also has similar magnitudes in these solid lubricant materials (few-layer graphene, h-BN, and MoS(2)), but it is absent in single-layer graphene and in few-layer mica and Bi(2)Se(3). We propose a physical mechanism for the effect where the combined compressive and shear stresses from the tip induce dynamical wrinkling on the upper material layers, leading to the observed flake thickening. The new effect (and, therefore, the proposed wrinkling) is reversible in the three materials where it is observed.

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