Scientific Reports (Mar 2017)

Gas-like adhesion of two-dimensional materials onto solid surfaces

  • Zhengrong Guo,
  • Tienchong Chang,
  • Xingming Guo,
  • Huajian Gao

DOI
https://doi.org/10.1038/s41598-017-00184-x
Journal volume & issue
Vol. 7, no. 1
pp. 1 – 6

Abstract

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Abstract The adhesion of two-dimensional (2D) materials onto other surfaces is usually considered a solid-solid mechanical contact. Here, we conduct both atomistic simulations and theoretical modeling to show that there in fact exists an energy conversion between heat and mechanical work in the attachment/detachment of two-dimensional materials on/off solid surfaces, indicating two-dimensional materials adhesion is a gas-like adsorption rather than a pure solid-solid mechanical adhesion. We reveal that the underlying mechanism of this intriguing gas-like adhesion is the configurational entropy difference between the freestanding and adhered states of the two-dimensional materials. Both the theoretical modeling and atomistic simulations predict that the adhesion induced entropy difference increases with increasing adhesion energy and decreasing equilibrium binding distance. Our findings provide a fundamental understanding of the adhesion of two-dimensional materials, which is important for designing two-dimensional materials based devices and may have general implications for nanoscale efficient actuators.