Optically Active Magnetic Composites with Responsive Silica Shells

The paper describes the synthesis of relatively large magnetic plasmonic composite particles. Their magnetic characteristics (M S and H C) reach sufficiently increased values if compared to other hybrid composites, owing to a compromise between size, percentage of the soft magnetic material, and to...

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Bibliographic Details
Published in:Journal of physical chemistry. C 2010-05, Vol.114 (17), p.7743-7750
Main Authors: Dávila-Ibáñez, Ana B, López-Quintela, M. Arturo, Rivas, José, Salgueirino, Veronica
Format: Article
Language:English
Subjects:
C: Nanops and Nanostructures
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Summary:The paper describes the synthesis of relatively large magnetic plasmonic composite particles. Their magnetic characteristics (M S and H C) reach sufficiently increased values if compared to other hybrid composites, owing to a compromise between size, percentage of the soft magnetic material, and to a remarkable morphology consisting of inner (smaller) cobalt boride clusters assembled as larger spheres (magnetic interactions) and stabilized with an outer shell of silica. These magnetically stable silica-coated cobalt boride spheres were optically functionalized, acquiring a characteristic surface plasmon. Outstandingly, due to the silica formation procedure (acid- or acid- and base-catalyzed), silica shells between the optical and magnetic functionalities were proven to undergo chemical and morphological changes translated into an optical response, broadening their field of application.
ISSN:1932-7447
1932-7455
DOI:10.1021/jp100190j