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Titolo:
Adsorbate-induced quenching of hot electrons in gold core-shell nanoparticles
Autore:
Westcott, SL; Averitt, RD; Wolfgang, JA; Nordlander, P; Halas, NJ;
Indirizzi:
Rice Univ, Dept Elect & Comp Engn, Houston, TX 77005 USA Rice Univ Houston TX USA 77005 t Elect & Comp Engn, Houston, TX 77005 USA Rice Univ, Dept Chem, Houston, TX 77005 USA Rice Univ Houston TX USA 77005 ice Univ, Dept Chem, Houston, TX 77005 USA Rice Univ, Dept Phys, Houston, TX 77005 USA Rice Univ Houston TX USA 77005 ice Univ, Dept Phys, Houston, TX 77005 USA Los Alamos Natl Lab, Los Alamos, NM 87545 USA Los Alamos Natl Lab Los Alamos NM USA 87545 Lab, Los Alamos, NM 87545 USA
Titolo Testata:
JOURNAL OF PHYSICAL CHEMISTRY B
fascicolo: 41, volume: 105, anno: 2001,
pagine: 9913 - 9917
SICI:
1520-6106(20011018)105:41<9913:AQOHEI>2.0.ZU;2-7
Fonte:
ISI
Lingua:
ENG
Soggetto:
METAL NANOPARTICLES; SILVER NANOPARTICLES; RELAXATION DYNAMICS; OPTICAL-PROPERTIES; SURFACE; NANOSHELLS; SPECTROSCOPY; FEMTOSECOND; INTERFACE; FILMS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
33
Recensione:
Indirizzi per estratti:
Indirizzo: Halas, NJ Rice Univ, Dept Elect & Comp Engn, Houston, TX 77005 USA Rice Univ Houston TX USA 77005 Comp Engn, Houston, TX 77005 USA
Citazione:
S.L. Westcott et al., "Adsorbate-induced quenching of hot electrons in gold core-shell nanoparticles", J PHYS CH B, 105(41), 2001, pp. 9913-9917

Abstract

We have investigated the effect of molecular adsorbates on the ultrafast electron dynamics in nanoshell particles. These nanoparticles consist of a thin gold shell surrounding a gold sulfide core. Pump-probe transmission measurements at 1.5 eV on unmodified nanoshells in aqueous solution yield an electron relaxation lifetime of similar to2.7 ps. The lifetime decreased with the adsorption of p-aminobenzoic acid (similar to1.7 ps) or aniline (similar to1.9 ps) on the nanoshells. With adsorbed p-mercaptobenzoic acid or n-propylamine, electron thermalization occurred in similar to2.4 or similar to2.8 ps, respectively. Surface-enhanced Raman signals were detected from the aromatic molecules, confirming their adsorption on the nanoshells. Density functional theory calculations indicate that the molecules providing the strongest modification of the dynamics possess the largest induced dipole moments near a metal surface. This suggests that the adsorbate-induced perturbation of the nanoshell electron dynamics is primarily electronic in nature.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 26/11/20 alle ore 11:44:44