Self-organization of nickel nanoparticles dispersed in acetone: from separate nanoparticles to three-dimensional superstructures

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Sonochemical synthesis of monodisperse nickel nanoparticles (Ni-NPs) by reduction of Ni acetylacetonate in the presence of polyvinylpyrrolidone stabilizer is reported. The Ni-NPs size is readily controlled to 5 nanometer diameter with a standard deviation of less than 5%. The as-prepared Ni-NPs sample was dispersed in acetone, for 4 weeks. For structural analysis was not applied to a magnetic field or heat treatment as key methods to direct the assembly. The transition from separate Ni-NPs into self-organization of three dimensions (3D) superstructures was studied by electron microscopy. Experimental analysis suggests that the translation and rotation movement of the Ni-NPs are governed by magnetic frustration which promotes the formation of different geometric arrangements in two dimensions (2D). The formation of 3D superstructures is confirmed from scanning electron microscopy revealing a layered domain that consists of staking of several monolayers having multiple well-defined supercrystalline domains, enabling their use for optical, electronic and sensor applications.

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Hernández-Pérez, I., Barriga-Arceo, L. D., Garibay Febles, V., Suárez-Parra, R., Luna Paz, R., Santiago, P., Rendón, L., Acosta Jara, J., Espinoza Tapia, J. C., & González-Reyes, L. (2017). Self-organization of nickel nanoparticles dispersed in acetone: from separate nanoparticles to three-dimensional superstructures. Journal of Saudi Chemical Society, 21(2), 238–244. https://doi.org/10.1016/j.jscs.2016.09.001

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