Controlled synthesis of SnO2 with hierarchical Micro/Nano structure

Preparing SnO₂ with hierarchical micro/nano structures by hydrothermal, coordination, templating and electrochemical deposition methods and their mechanisms are investigated. The result shows that the echinus-like SnO₂ prepared by Method 1 is a typical Ostwald mechanism that develops from internally to externally. The cabbage-like SnO₂ by Method 2 is produced with oxalic acid as complexing agent to set-up precursor of SnO₂, and then precursors are bocked around the body that is around the body being bocked. The nest-like SnO₂ by Method 3 is controlled by citric acid as coordinator for the nucleation as well as the grow rate and setup process. Spongy-like SnO₂ by Method 4 is produced using PST as template, PST is be infiltered into SnO₂ precursor by gravity and capillary and treated thermally to form a multiporous structure. The petal-like SnO₂ by Method 5 is formed with crystal deposition emergence due to oxidation-reduction reactions of two electrodes in an electric field. XRD analyses shows that the five results are all pure phase SnO₂. It provides basic data for SnO₂ industrial application.