Abstract
Gold-core/silver-shell nanoparticles featuring core diameters of 13 or 25 nm were prepared in aqueous solution. Silver-coated gold nanoparticles have two distinct plasmon absorption bands whose relative intensities depend on the shell thickness - features that are captured well by classical Mie theory. The core/shell spectra are not simply linear combinations of the pure-component spectra. Theory shows that shell dielectric effects upon the core can cause broadening, shifting, and, in some cases, damping of dominant extinction spectral features. Preliminary studies show that core-shell particles are reasonably efficient hyper-Rayleigh scatterers under conditions of two-photon resonance or near resonance with a high-energy plasmon band.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 421-428 |
| Number of pages | 8 |
| Journal | Chemical Physics Letters |
| Volume | 352 |
| Issue number | 5-6 |
| DOIs | |
| State | Published - Feb 6 2002 |
Funding
We thank the Army Research Office (MURI program) and the Northwestern Materials Research Center (NSF MRSEC program) for support of our work.
ASJC Scopus subject areas
- General Physics and Astronomy
- Physical and Theoretical Chemistry