Journal
CHEMISTRY OF MATERIALS
Volume 25, Issue 18, Pages 3702-3709Publisher
AMER CHEMICAL SOC
DOI: 10.1021/cm402036d
Keywords
Mn-Zn ferrite nanostructures; shape evolution; oriented attachment; high performance
Funding
- National Basic Research Program of China [2011CB933503, 2013CB733800]
- National Natural Science Foundation of China [31170959, 81071445]
- Basic Research Program of Jiangsu Province (Natural Science Foundation) [BK2011036]
- National Key Technology Research and Development Program of China [2012BAI23B02]
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Monodisperse magnetic MnZn ferrite nanostructures with various morphologies have been successfully synthesized via high-temperature decomposition of metal acetylacetonate (acac) in the presence of oleic acid (OA) and oleyamine (OAm). In a classical crystal nucleation/growth process, differential stabilization of OA on specific crystal facets may alter relative crystal growth rates, resulting in the formation of zero-dimensional (0-D) spherical, cubical, and starlike nanocrystals (ca. 9, 11, 16 nm), respectively. Furthermore, shortening nucleation duration might bring a deficient nucleation and a rapid increase in monomer concentration, which accelerates the subsequent growth process of nanocrystals, leading to the formation of the starlike nanocrystals with larger size (ca. 1923 nm). They are further oriented to assemble reciprocally, gradually forming initial three-dimensional (3-D) branched nanoclusters (ca. 3040 nm) to minimize the magnetostatic energy, owing to their size-dependent magnetic dipolar interaction. In addition, the surface-defect-induced secondary growth of the branched nanoclusters may considerably improve their uniformity, accompanied by the size increase in the presence of the monomers, resulting in the final multibranched nanoclusters with formation of sharp or obtuse edges (ca. 4550 nm). Our study reveals the transformation of 0-D nanocrystals to 3-D nanoclusters as well as the shape evolution mechanism, which provide a versatile synthetic strategy for shape-controlled nanostructure. The multibranched nanoclusters have the higher magnetization and magnetically induced heating efficiency in an alternating current magnetic field, which can be used as promising heating agents for biomedical application.
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