Charge Transfer at Hybrid Interfaces: Plasmonics of Aromatic Thiol-Capped Gold Nanoparticles

Although gold nanoparticles stabilized by organic thiols are the building blocks in a wide range of applications, the role of the ligands on the plasmon resonance of the metal core has been mostly ignored until now. Herein, a methodology based on the combination of spectroscopic ellipsometry and UV–...

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Bibliographic Details
Published in:ACS nano 2015-07, Vol.9 (7), p.7572-7582
Main Authors: Goldmann, Claire, Lazzari, Rémi, Paquez, Xavier, Boissière, Cédric, Ribot, François, Sanchez, Clément, Chanéac, Corinne, Portehault, David
Format: Article
Language:English
Subjects:
Charge transfer
Chemical Sciences
Gold
Ligands
Material chemistry
Nanoparticles
Nanostructure
Plasmonics
Plasmons
Thiols
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Summary:Although gold nanoparticles stabilized by organic thiols are the building blocks in a wide range of applications, the role of the ligands on the plasmon resonance of the metal core has been mostly ignored until now. Herein, a methodology based on the combination of spectroscopic ellipsometry and UV–vis spectroscopy is applied to extract dielectric functions of the different components. It is shown that aromatic thiols allow a significant charge transfer at the hybrid interface with the s and d bands of the gold core that yields “giant” red shifts of the plasmon band, up to 40 nm for spherical particles in the size range of 3–5 nm. These results suggest that hybrid nanoplasmonic devices may be designed through the suitable choice of metal core and organic components for optimized charge exchange.
ISSN:1936-0851
1936-086X
DOI:10.1021/acsnano.5b02864