Fig. 2: Nanoindentation experiments of TBLM.
From: Determining the interlayer shearing in twisted bilayer MoS2 by nanoindentation
a Schematic diagram of nanoindentation tests. F is the point force applied to the suspended region of the sample, z is the moving distance between the tip and the sample, and δ is the indentation depth of the suspended membrane. b Typical F-δ curve (orange circles) of a TBLM sample with the red line showing a fitting of the F-δ curve following Eq. (1). c Dependence of measured in-plane elastic moduli of TBLM on twist angles. Blue stars and orange stars mark the measured moduli of each suspended membrane over 1-μm-diameter and 1.5-μm-diameter holes, respectively. The blue circles and red spheres are the corresponding average values. Error bars represent standard deviations. The gray dashed line represents the in-plane moduli of monolayer MoS2 on SiO2.
