Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 24, Issue 10, Pages 1439-1448Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201302405
Keywords
supraparticles; magnetoplasmonics; nanoparticles; non-Platonic shapes; self-assembly
Categories
Funding
- Korea Healthcare Technology R&D Project, Ministry for Health, Welfare Family Affairs [A110191]
- New & Renewable Energy program of the KETEP [20103020010050]
- Ministry of Knowledge Economy
- Center for Solar and Thermal Energy Conversion, Energy Frontier Research Center
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-SC0000957]
- NSF [ECS-0601345, EFRI-BSBA 0938019, CBET 0933384, CBET 0932823, CBET 1036672]
- ARO MURI [W911NF-12-1-0407]
- Korea Health Promotion Institute [HI11C0179020013, A110191] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Council of Science & Technology (NST), Republic of Korea [C33220] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [10Z20130000004, 2014R1A1A2007222] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Concave nanoparticles (NPs) with complex angled and non-Platonic geometries have unique optical, magnetic, catalytic, and biological properties originating from the singularities of the electrical field in apexes and craters. Preparation of such particles with a uniform size/shape and core-shell morphology represents a significant challenge, largely because of the poor knowledge of their formation mechanism. Here, this challenge is addressed and a study of the mechanism of their formation is presented for a case of complex spiky morphologiesthat led us to the conclusion that NPs with concave geometries can be, in fact, supraparticles (SPs) produced via the self-assembly of smaller convex integrants. This mechanism is exemplified by the vivid case of spiky SPs formed via the attachment of small and faceted Au NPs on smooth Au-coated iron oxide (Fe3O4@Au) seeds. The theoretical calculations of energies of primary interactionselectrostatic repulsion and van-der Waals repulsion, elaborated for this complex caseconfirm experimental observation and the self-limiting mechanism of SP formation. Besides demonstrating the mechanistic aspects of synthesis of NPs with complex geometries, this work also uncovers a facile approach for preparation of concave magnetoplasmonic particles. When combined with a spiky geometry, such bi-functional magnetoplasmonic SPs can serve as a unique platform for optoelectronic devices and biomedical applications.
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