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

• Published in: Scientific reports Vol. 7; no. 1; p. 159
• Main Authors: Guo, Zhengrong, Chang, Tienchong, Guo, Xingming, Gao, Huajian
• Format: Journal Article
• Language: English
• Published: England Nature Publishing Group UK 13.03.2017; Nature Portfolio
• Subjects: Adsorption; Biomechanical Phenomena; Entropy; Models, Molecular; Surface Properties
• ISSN: 2045-2322; 2045-2322
• DOI: 10.1038/s41598-017-00184-x

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.