Buckling 2D Materials: Revisiting the Buckling Metrology Method to Determine the Young's Modulus of 2D Materials (Adv. Mater. 10/2019)

Abstract

Probing the mechanical properties of two‐dimensional materials represents a challenging task due to their reduced dimensions. In article number https://doi.org/10.1002/adma.201807150, Andres Castellanos‐Gomez and co‐workers demonstrate the feasibility to determine the Young's modulus of atomically thin crystals through the buckling metrology method: uniaxial compression of two‐dimensional materials leads to formation of ripples, whose wavelength is intrinsically related to their mechanical properties.

Carrier Trapping in Wrinkled 2D Monolayer MoS2 for Ultrathin Memory

“…In addition, the height and wavelength of wrinkles in MoS 2 can be controlled by changing the Poisson's ratio, Young's modulus, and thickness of PDMS and MoS 2 . 38 Finally, the wrinkled MoS 2 flakes were transferred by directly pasting PDMS onto another SiO 2 /Si substrate, yielding to the free wrinkled MoS 2 on SiO 2 /Si (Figure 5c). The optical microscopy images in Figure S7 in the Supporting Information clearly show the formation of wrinkles in MoS 2 after the PDMS-assisted transfer process.…”

“…After releasing the strain in PDMS, uniaxial wrinkles formed in MoS 2 flakes due to the strong adhesive force and large Young’s modules mismatch (Figure b). In addition, the height and wavelength of wrinkles in MoS 2 can be controlled by changing the Poisson’s ratio, Young’s modulus, and thickness of PDMS and MoS 2 . Finally, the wrinkled MoS 2 flakes were transferred by directly pasting PDMS onto another SiO 2 /Si substrate, yielding to the free wrinkled MoS 2 on SiO 2 /Si (Figure c).…”

Mechanical and Kelvin Probe Force Microscopy Investigations of Ultrathin Membranes Based on MoS2 and MoSe2

“…[30] Young's modulus of 2D materials can be determined using various methods including nanoindentation, nanomechanical resonator, micro-Brillouin scattering, microtensile test, and bimodal atomic force microscopy (AFM). [31] Bertolazzi et al measured the mechanical properties of a MoS 2 membrane using nanoindentation. [32] Similar results using bimodal AFM were obtained by Li et al [33] A larger Young's modulus was determined by Castellanos-Gomez et al using a nanomechanical resonator.…”