The effect of pressure on the surface plasmon absorption spectra of colloidal gold and silver particles

Journal Article · Wed May 09 04:00:00 EDT 1990 · Journal of the American Chemical Society; (USA)

DOI:https://doi.org/10.1021/ja00166a004· OSTI ID:6547814

Coffer, J L; Shapley, J R; Drickamer, H G ^[1]

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1. 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), Journal Name: Journal of the American Chemical Society; (USA) Vol. 112:10; ISSN 0002-7863; ISSN JACSA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ABSORPTION SPECTRA
COLLOIDS
DATA
DATA ANALYSIS
DISPERSIONS
ELEMENTS
EXPERIMENTAL DATA
GOLD
INFORMATION
MEASURING INSTRUMENTS
MEASURING METHODS
METALS
NUMERICAL DATA
PLASMONS
PRESSURE EFFECTS
QUASI PARTICLES
SILVER
SPECTRA
TRANSITION ELEMENTS
VERY HIGH PRESSURE