Cation exchange on colloidal copper selenide nanosheets: a route to two-dimensional metal selenide nanomaterials

Up to 5 μm large ca. 5 nm thick PbSe, HgSe, SnCuSe, ZnCuSe, and Cu–Zn–Sn–Se nanosheets (NSs) were synthesized via cation exchange starting from CuSe NSs, offering a universal platform for the synthesis of other metal selenide 2D nanomaterials.