Self-assembly of tiled perovskite monolayer and multilayer thin films

Dion-Jacobson phases are layer perovskites of the general formula A'[A(n-1)B(n)O(3n+1)], where A' is typically an exchangeable alkali or alkali earth ion. Because of their low layer charge density, acid-exchanged Dion-Jacobson phases are easily exfoliated to make single-sheet colloids. When the conditions temperature and pH were controlled, densely tiled monolayers of anionic sheets derived from HCa₂Nb₃O₁₀, HSr₂Nb₃O₁₀, HCaLaNb₂TiO₁₀, and HLaNb₂O₇ were grown on cationic substrates. Multilayer films were also assembled by alternately adsorbing these sheets and organic polycations.