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A bottom-up-then-up-down route was proposed to construct multi-level Bi 2 S 3  hierarchical architectures assembled by two-dimensional (2D) Bi 2 S 3  sheet-like networks. BiOCOOH hollow spheres and flower-like structures, which are both assembled by 2D BiOCOOH nanosheets, were prepared first by a “bottom-up” route through a “quasi-emulsion” mechanism. Then the BiOCOOH hierarchical structures were transferred to hierarchical Bi 2 S 3  architectures through an “up-down” route by an ion exchange method. The obtained Bi 2 S 3  nanostructures remain hollow-spherical and flower-like structures of the precursors but the constructing blocks are changed to 2D sheet-like networks interweaving by Bi 2 S 3  nanowires. The close matching of crystal lattices between Bi 2 S 3  and BiOCOOH was believed to be the key reason for the topotactic transformation from BiOCOOH nanosheets to 2D Bi 2 S 3  sheet-like nanowire networks. Magnetism studies reveal that unlike diamagnetism of comparative Bi 2 S 3  nanostructures, the obtained multi-level Bi 2 S 3  structures display S-type hysteresis and ferromagnetism at low field which might result from ordered structure of 2D networks.

Bottom-up-then-up-down Route for Multi-level Construction of Hierarchical Bi2S3 Superstructures with Magnetism Alteration