Synthesis and Characterization of Plasmonic Asymmetric Hybrid Nanoparticles

AHNs were fabricated by vacuum evaporation of thin layers of SiO, LiF, Ti, Al, Cr, Ni, and Fe onto Ag nanoparticles immobilized on glass substrates modified with poly(4-vinylpyridine). After the deposition, the particles were stripped into solution and characterized by UV−vis spectroscopy as well as...

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Bibliographic Details
Published in:Chemistry of materials 2007-08, Vol.19 (17), p.4222-4227
Main Authors: Hudson, Stephen D, Chumanov, George
Format: Article
Language:English
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Summary:AHNs were fabricated by vacuum evaporation of thin layers of SiO, LiF, Ti, Al, Cr, Ni, and Fe onto Ag nanoparticles immobilized on glass substrates modified with poly(4-vinylpyridine). After the deposition, the particles were stripped into solution and characterized by UV−vis spectroscopy as well as transmission and scanning electron microscopy. The presence of the caps shifted the plasmon resonance into the red spectral region according to the refractive index of the cap material. In the case of metals, specifically Fe, the cap damped the plasmon resonance, and to minimize this effect, a thin layer of SiO was deposited between the Ag core and Fe cap. A thin layer of SiO also was deposited on top of the Fe cap to protect the latter from oxidation in the aqueous environment. The Fe cap rendered magnetic properties to plasmonic AHNs.
ISSN:0897-4756
1520-5002
DOI:10.1021/cm070998y