Surfactant Directed Synthesis And Properties Of Novel Metal Oxide Hollow Structure With Hydrothermal Treatment

Inorganic hollow micro/nanostructures have been one of the research frontiers and focuses for nanomaterials field due to their low density, high specific surface area, monodispersivity, stability, and novel multifunctional properties arising from combining different materials into the hollow interiors and potential applications in micro/nanoscale chemical reactors, drug-delivery carriers, photonic building blocks, efficient catalysts, energy-storage media and so forth. This article reviews the recent progress in the synthesis, characterization and properties of this new field for inorganic hollow micro/nanostructures.Wire- and rod-like Fe₂O₃ have been fabricated by direct deposition. The fabrication of ring-likeα-Fe₂O₃ has not been reported. In this paper, we report a facile hydrothermal method for the preparation of novel ring-likeα-Fe₂O₃ via the redox reaction of Fe2+ with S2O82- in solution.It is still a challenge to synthesize Fe₂O₃ hollow sphere via a one-step process without hard templates in solution. In this paper, we used two reaction roads and single-step process to synthesize amorphism Fe₂O₃ andα-Fe₂O₃ crystal.Owing to the perfect property of non-sphericalα-Fe₂O₃ hollow structures, we used PEG template and Ostwald ripening to synthesizeα-Fe₂O₃ hollow spindle structure. And it is the first to study the magnetic properties of spindle and spherer-like hollowα-Fe₂O₃。With hydrothermal treatment, we get novel Fe3O4 nanobelt, Co3O4 nanoplate and MnO2 cuniform.