Microdroplet fusion driving the mass formation of twisted bilayer molybdenum disulfide fragments via spontaneous liquid-liquid phase separation

The stacking of 2D materials has attracted attention from emergent properties by Moiré patterns, a degree of freedom that is artificially controlled. However, the current process of arranging Moiré patterns, which involves mechanically repeating the pick-up and restacking of 2D materials, is a non-scalable method. Here, we developed a method of mass producing twisted stacking structures of 2D materials using the cohesive motion of droplets formed via the liquid-liquid phase separation phenomenon, in which droplets spontaneously form in a uniform solution. The droplets move in the separated liquid matrix, induce the folding of 2D materials, and enable the mass production of twisted stacking structures.