Cobalt–iron cyanide hollow cubes: Three-dimensional self-assembly and magnetic properties

Cobalt–iron cyanide hollow cubes have been synthesized via a poly(vinylpyrrolidone) assisted solvothermal route. A unique formation process: self-assembly followed by Ostwald ripening process, has been put forward to take account for the construction of hollow cubes. The rod-like nanocrystals first assemble as porous cubes via an oriented attachment process. Then, the porous cubes undergo an Ostwald-ripening process, which create interior spaces and result in the formation of hollow cubes. The magnetic property investigation reveals that K0.22Co0.58Fe2.2(CN)6 hollow cubes exhibit a ferromagnetic behavior.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► We synthesize cobalt–iron cyanide hollow cubes via a solvothermal route. ► The hollow cubes is formed through a self-assembly process followed by Ostwald ripening process. ► The hollow cubes are ferromagnetic.