Artificial solids by design: Assembly and electron microscopy study of nanosheet-derived heterostructures

We present the bottom-up fabrication of an artificial superlattice derived from positively charged layered double hydroxide (LDH) and negatively charged perovskite nanosheets sequentially assembled by electrostatic layer-by-layer deposition. In contrast to previously employed bulk methods, we use a combination of HRTEM, STEM and EEL spectroscopy to elucidate the structure and composition of the multilayer stack with high spatial resolution on the subnanometer scale. In addition, we demonstrate that the packing density of the multilayer system can be tuned by changing the LDH dispersing agent.