Facile synthesis of QD-anchored composite particles with magnetite cluster cores ((Fe3O4)-Fe-n@SiO2@QDs)
- Authors
- Oh, Hang-Deok; Lee, Sang-Wha
- Issue Date
- Jun-2013
- Publisher
- PERGAMON-ELSEVIER SCIENCE LTD
- Keywords
- Magnetic materials; Nanostructures; Sot-gel chemistry; Luminescence; Magnetic properties
- Citation
- MATERIALS RESEARCH BULLETIN, v.48, no.6, pp.2191 - 2195
- Journal Title
- MATERIALS RESEARCH BULLETIN
- Volume
- 48
- Number
- 6
- Start Page
- 2191
- End Page
- 2195
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/14504
- DOI
- 10.1016/j.materresbull.2013.02.053
- ISSN
- 0025-5408
- Abstract
- Magnetism-controlled fluorescent composite particles ((Fe3O4)-Fe-n@SiO2@QDs) were prepared as QD-anchored silica nanoparticles with magnetite cluster cores. First, citrate-capped magnetites (C-Fe3O4) were prepared by the co-precipitation method and subsequently complexed with 3-aminopropyl-trimethoxysilane (APTMS) at room temperature, consequently leading to the formation of magnetite clusters (A-(Fe3O4)-Fe-n) with alkoxy terminated interfaces. The sol-gel reaction between A-(Fe3O4)-Fe-n and tetraethoxysilane (TEOS) produced the core-shell (Fe3O4)-Fe-n@SiO2. The resulting core-shell particles exhibited superparamagnetic properties and controllable magnetism simply by adjusting the thickness of nonmagnetic silica layer. After then, amine-terminated (Fe3O4)-Fe-n@SiO2 (NH2-(Fe3O4)-Fe-n@SiO2) was conjugated with carboxy quantum dots (QDs) using an EDC coupling agent. The QD conjugation with NH2-(Fe3O4)-Fe-n@SiO2 of lower pH exhibited the higher photoluminescence (PL) intensity, and the resulting composite particles ((Fe3O4)-Fe-n@SiO2@QDs) can be a useful biomedical agent. This chemical strategy can be further applied to prepare the core-shell magnetic nanostructure with various oxide layers for specific applications. (C) 2013 Elsevier Ltd. All rights reserved.
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