Recently, researchers from the State Key Laboratory of Nanostructures and Multi-level Manufacturing, National Center for Nanoscience and Nanotechnology, Chinese Academy of Sciences, cooperated with Zhang Zhi, Liu Luqi and Xu Zhiping, a professor at Tsinghua University to design and develop micro and nanospheric bubble mechanics experiments to accurately characterize double- Van der Waals shear between layers.
Micro-nano bubbling mechanics experiment diagram
Relevant Research Results Measuring Interlayer Shear Stress in Bilayer Graphene was published in Phys. Rev. Lett. 119 (2017) 036101 and as the current editor Recommended Articles (Editors' Suggestion).
This work was also reported as a Focus Story in "Physics 10 (2017) 81] with Graphene Sliding on Graphene, which is believed to be the first measurement by the bubbling method Creating a bulge in a graphene sheet offers the first measurement of the shear forces between graphene layers, an essential factor in many graphene-based devices. The research work has been supported by the National Basic Research Program Nano R & D Program and the National Outstanding Young Scientist Fund.
Two-dimensional materials show a variety of excellent and novel features, has been widely concerned and research. In fact, due to the limitation of fabrication technology or the need of functional design, the two-dimensional materials of single atomic layer are often stacked into multi-layer structure, multi-layer graphene / polymer composite material, Material capacitors, multilayer two-dimensional material heterojunction, etc. are more common examples.
As a "surface-to-surface" material, the interfacial van der Waals interactions between layers of two-dimensional material are of crucial importance to the functional properties of the application and to the reliability of service. However, the key parameters of deformation and function of two- Very few.
The research team cleverly designed a microbubble bubbling experimental method to control the substrate adsorption outside the "draw" hole by controlling the pressure difference between the inside and outside of the micro-nanohole evenly and controlling the monolayer / double-layer graphene to swell on the hole Of single-layer / double-layer graphene slip to the center of the micropore; in the double-layer graphene bubble experiment, compared with the interface between the underlying graphene and the silica substrate, the graphene interlayer interface has more Weak shear resistance.
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