The effect of pressure on the surface plasmon absorption spectra of colloidal gold and silver particles
- Univ. of Illinois, Urbana (USA)
The first measurements of the effect of pressure on the peak position ({omega}{sub sp}) and line width (fwhm) of the surface plasmon absorption in several Au and Ag hydrosols have been recorded up to 10 kbar. Red shifts of the plasmon peak with increasing pressure are observed for relatively large metal particles prepared by the citrate procedure (Au, {anti d} = 265 {angstrom}; Ag, {anti d} = 230 {angstrom}). The shift for silver is over twice that of gold ({minus}420 cm{sup {minus}1} vs {minus} 200 cm{sup {minus}1}). These red shifts are interpreted in terms of pressure-induced volume changes within the context of a free-electron model. In contrast, particles prepared by the Faraday method (Au, {anti d} = 54 {angstrom}; Ag, d{anti d} = 60 {angstrom}) show initial blue shifts with pressure, with the magnitude again larger for silver. Upon aging (as well as upon heating in the case of Au), the Au and Ag Faraday sols exhibit an increase in their average particle size and degree of aggregation. Correspondingly, the pressure response of their plasmon absorption approaches that of the citrate sols.
- DOE Contract Number:
- AC02-76ER01198
- OSTI ID:
- 6547814
- Journal Information:
- Journal of the American Chemical Society; (USA), Vol. 112:10; ISSN 0002-7863
- Country of Publication:
- United States
- Language:
- English
Similar Records
Preparation and stability of template-synthesized metal nanorod sols in organic solvents
Chemisorption effects on colloidal lead nanoparticles
Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
COLLOIDS
ABSORPTION SPECTRA
DATA ANALYSIS
EXPERIMENTAL DATA
GOLD
MEASURING INSTRUMENTS
MEASURING METHODS
PLASMONS
PRESSURE EFFECTS
SILVER
VERY HIGH PRESSURE
DATA
DISPERSIONS
ELEMENTS
INFORMATION
METALS
NUMERICAL DATA
QUASI PARTICLES
SPECTRA
TRANSITION ELEMENTS
400201* - Chemical & Physicochemical Properties