报告摘要：Due
to their atomically thin structure, it is challenging to measure the
mechanical properties of two-dimensional (2D) materials via conventional
tensile and bending experiments, and nanoindentation has become the
most common and versatile method of choice. In the latter approach, the
indentation load-displacement relationship of a 2D material, either
free-standing or on a substrate, is measured, and its mechanical
properties are then determined by fitting the measured load-displacement
curve with an analytical model. However, the existing indentation
models are not originally developed for atomically thick 2D-materials
and have led to some difficulties or controversies in the field. There
is now an urgent need to develop new analytical models capable of
describing the indentation response of 2D-materials to accurately obtain
their mechanical properties. Here we review some of the progresses in
recent years on the mechanical properties characterization of
2D-mateirals via nanoindentation experiments, with the aim to bring out
some of the existing issues and opportunities for future studies in this
field.
