title: Charge Transfer at Hybrid Interfaces: Plasmonics of Aromatic Thiol-Capped Gold Nanoparticles.
abstract: 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.
authors.affiliation: †Sorbonne Universités, UPMC Univ Paris 06, CNRS, Collège de France, Laboratoire de Chimie de la Matière Condensée de Paris (LCMCP), 11 place Marcelin Berthelot, F-75005 Paris, France.
authors.forename: Claire
authors.initials: C
authors.lastname: Goldmann
authors.affiliation: ‡Sorbonne Universités, CNRS, UPMC Univ Paris 06, Institut des NanoSciences de Paris (INSP), 4 Place Jussieu, F-75005 Paris, France.
authors.forename: Rémi
authors.initials: R
authors.lastname: Lazzari
authors.affiliation: †Sorbonne Universités, UPMC Univ Paris 06, CNRS, Collège de France, Laboratoire de Chimie de la Matière Condensée de Paris (LCMCP), 11 place Marcelin Berthelot, F-75005 Paris, France.
authors.forename: Xavier
authors.initials: X
authors.lastname: Paquez
authors.affiliation: †Sorbonne Universités, UPMC Univ Paris 06, CNRS, Collège de France, Laboratoire de Chimie de la Matière Condensée de Paris (LCMCP), 11 place Marcelin Berthelot, F-75005 Paris, France.
authors.forename: Cédric
authors.initials: C
authors.lastname: Boissière
authors.affiliation: †Sorbonne Universités, UPMC Univ Paris 06, CNRS, Collège de France, Laboratoire de Chimie de la Matière Condensée de Paris (LCMCP), 11 place Marcelin Berthelot, F-75005 Paris, France.
authors.forename: François
authors.initials: F
authors.lastname: Ribot
authors.affiliation: †Sorbonne Universités, UPMC Univ Paris 06, CNRS, Collège de France, Laboratoire de Chimie de la Matière Condensée de Paris (LCMCP), 11 place Marcelin Berthelot, F-75005 Paris, France.
authors.forename: Clément
authors.initials: C
authors.lastname: Sanchez
authors.affiliation: †Sorbonne Universités, UPMC Univ Paris 06, CNRS, Collège de France, Laboratoire de Chimie de la Matière Condensée de Paris (LCMCP), 11 place Marcelin Berthelot, F-75005 Paris, France.
authors.forename: Corinne
authors.initials: C
authors.lastname: Chanéac
authors.affiliation: †Sorbonne Universités, UPMC Univ Paris 06, CNRS, Collège de France, Laboratoire de Chimie de la Matière Condensée de Paris (LCMCP), 11 place Marcelin Berthelot, F-75005 Paris, France.
authors.forename: David
authors.initials: D
authors.lastname: Portehault
keywords: aromatic ligands; charge transfer; gold nanoparticles; plasmonic properties; thiols