“…Self-assembly of nanocrystals and successive epitaxy by either dissolving the capping ligands in a suitable solvent or via a chemical trigger has emerged as a promising route to make single crystals with complex nanoscale geometries. 1 − 10 This approach is very flexible, including variants where particles are both assembled and epitaxially connected in solution—usually called oriented attachment 7 , 9 , 11 − 15 —or where assembly first occurs at an interface (liquid–liquid, liquid–solid, or liquid–vapor) 1 , 9 , 10 , 16 − 25 followed by the epitaxy step (thermal, chemical, or optical). 3 , 4 , 10 , 15 , 26 − 30 Interfacial assembly via aforementioned techniques can lead to 2D films with nanoscale patterns determined by the shape and surface energetics of the particle, such as a 2D honeycomb lattice, or to more complex nanopatterns formed by capillary assembly.…”