In this work, a top-down strategy to prepare metastable wurtzite Cu2SnS3 nanocrystals is reported for the first time. The wurtzite Cu2SnS3 nanocrystals with diameters of 7±3 nm are synthesized by reacting Cu2O nanocubes in a tin metal chalcogenide complex (Sn-MCC) aqueous solution. A conversion process of cubic Cu2O nanocubes → monoclinic Cu7S4 nanoboxes → hexagonal CuS nanoboxes → wurtzite Cu2SnS3 nanoboxes → wurtzite Cu2SnS3 nanocrystals is systematically investigated.
