Nanocrystals of Co₃O₄ have been made by a hydrothermal process utilizing microwaves, resulting in cube shaped crystals with dimensions in the range of 10 – 90 nm. The Co₃O₄ cubes have further been used as core material for 3D layered growth of Al₂O₃ and Fe₂O₃ by ALD, see Figure 1. These are the first steps towards multilayered core-shell materials by ALD. Such core-shell materials may show unique properties not found in their components alone^[1]. The challenge has been to construct means to cover the nanocubes equally on all sides in the ALD reactor. Different approaches include deposition on cubes placed on different flat substrates and the use of a powder cell, as well as direct synthesis on TEM grids.

Figure 1: Multilayers of Fe₂O₃ and Al₂O₃ on a Co₃O₄ nanocube

[1] Lloyd, S. J.;Molina-Aldareguia, J. M. Philos. Trans. R. Soc. Lond. A 2003, 361, 2931-2949.

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