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Wüstite nanocrystals: Synthesis, structure and superlattice formation

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Abstract

Monodisperse ligand-capped cubic wüstite FexO nanocrystals were prepared by a novel thermal decomposition method of iron (II) acetate in the presence of oleic acid as the surfactant. Controlled size distributions of cubic nanoparticles possessing the rock salt crystal structure were isolated in the range 10–18 nm. The influence of molar ratio of surfactant to precursor was investigated to understand size control and monodispersity. Using inexpensive, nontoxic metal salts as reactants, we were able to synthesize gram-scale quantities of relatively monodisperse nanocrystals in a single reaction, without further size selection, characterized by x-ray diffraction and transmission electron microscopy. The procedure enables the collection of samples of uniform size as a function of time, thus permitting a preliminary solid-state kinetic analysis of the reaction as a function of increasing particle size. Following controlled evaporation from nonpolar solvents, self-assembly into two-dimensional arrays, three-dimensional single-component superlattices, and binary superlattices with gold nanoparticles were observed and characterized.

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ACKNOWLEDGMENTS

This work was supported primarily by the MRSEC program of the National Science Foundation under award number DMR-0213574, and NSF-CAREER award, DMR-0348938, and relied on equipment supported by the NSEC program of the National Science Foundation under Award Number CHE-0117752, NSF-CHE-04-15516, and by the New York State Office of Science, Technology, and Academic Research (NYSTAR). Partial support was appreciated from the United States Department of Energy, Office of Basic Energy Sciences, through the Catalysis Futures grant DE-FG02-03ER15463.

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  1. Ming Yin

    Present address: Los Alamos National Laboratory, Los Alamos, NM, 87545, USA

Authors and Affiliations

  1. Materials Research Science and Engineering Center, Department of Applied Physics and Applied Mathematics, Columbia University, New York, New York, 10027, USA

    Ming Yin, Zhuoying Chen, Brian Deegan & Stephen O’Brien

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  1. Ming Yin
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  2. Zhuoying Chen
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Correspondence to Stephen O’Brien.

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Yin, M., Chen, Z., Deegan, B. et al. Wüstite nanocrystals: Synthesis, structure and superlattice formation. Journal of Materials Research 22, 1987–1995 (2007). https://doi.org/10.1557/jmr.2007.0247

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