Direct TEM observations of growth mechanisms of two-dimensional MoS2 flakes

A microscopic understanding of the growth mechanism of two-dimensional materials is of particular importance for controllable synthesis of functional nanostructures. Because of the lack of direct and insightful observations, how to control the orientation and the size of two-dimensional material grains is still under debate. Here we discern distinct formation stages for MoS 2 flakes from the thermolysis of ammonium thiomolybdates using in situ...