Abstract
Gold nanoparticles prepared through a conventional citrate-reduction method were directly coated with silica by means of a seeded polymerization technique based on the Stöber method. The method required no surface modification. The addition of tetraethylorthosilicate and water prior to ammonia was found to be critical to obtain a proper coating. The silica shell thickness was varied from 30 to 90 nm for TEOS concentrations of 0.0005-0.02 M at 10.9 M of water and 0.4 M of ammonia. The optical spectra of the core-shell gold-silica composite particles agreed with predictions of Mie theory.
Original language | English |
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Pages (from-to) | 385-390 |
Number of pages | 6 |
Journal | Journal of Colloid And Interface Science |
Volume | 264 |
Issue number | 2 |
DOIs | |
Publication status | Published - 2003 Aug 15 |
Keywords
- Coating
- Core-shell
- Gold
- Mie theory
- Nanoparticle
- Seeded polymerization
- Silica
- Sol-gel
- Stöber method
- Surface plasmon resonance
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Biomaterials
- Surfaces, Coatings and Films
- Colloid and Surface Chemistry