Recent progress in the synthetic methods of inorganic nanoparticles facilitates their application as building blocks for miniaturized devices. One of the possible strategies to construct such devices is the controlled preparation of two or three dimensional superlattices, that is, periodic arrays of nanoparticles. Even though most of them comprise simple spherical nanoparticles, a variety of periodic structures have been prepared by using binary components or designed chemical interaction. We believe that the use of polyhedral nanoparticles also widens the world of composed superlattices, because the polyhedral shape possibly enables the sterically restricted inter-particle interaction, leading to the unique coordination number and controlled assembly of nanoparticles. We have studied hydrothermal synthesis of metal oxide nanoparticles that were chemically modified by carboxylic acids or amines. In this presentation, we report one-step hydrothremal synthesis of cubic nano-assemblies that were composed from surface-modified octahedral CeO₂ nanoparticles. Octahedral coordination of the primary CeO₂ nanoparticles plausibly led to quasi-bcc packing and built the cubic nano-assemblies, which had the different shape as the primary nanoparticles.

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1. Kinetic Study on the Hydrothermal Synthesis of Surface-Modified Cerium Oxide Nanoparticles Using a Flow-Type Reactor