Oxidation−Crystallization Process of Colloids: An Effective Approach for the Morphology Controllable Synthesis of SnO2 Hollow Spheres and Rod Bundles

In this article, we have demonstrated that the oxidation−crystallization method of amorphous colloids in the microreactor systems generated by soft templates is convenient and feasible in the large-scale production of hollow and one-dimensional (1D) structures. Through the air oxidation and crystallization of colloidal spheres in the different systems, SnO 2 hollow spheres and rod bundles, respectively, were controllably obtained. The detailed growth processes of SnO 2 hollow spheres and rod bundles were investigated. When SnO 2 hollow spheres and rod bundles were used as an anode material for lithium-ion batteries, they exhibited relatively high electrochemical capacities. Thus, it is rational to expect that this simple method can be extended to systems of other inorganic materials with desired morphologies.