Radiolytically induced formation and optical absorption spectra of colloidal silver nanoparticles in supercritical ethane.
Colloidal silver nanoparticles were synthesized in supercritical ethane at 80 {sup o}C and 80-120 bar, with methanol as cosolvent. Solvated electrons, produced by a pulse of 20 MeV electrons, reduced the silver ions. The time-resolved technique of pulse radiolysis was employed to characterize the reduction products and colloidal metallic particles. The absorption spectra of small silver clusters (Ag{sub 2}{sup +}, Ag{sub 3}{sup +}, Ag{sub 4}{sup 2+}, etc.) were detected at short times after the pulse. Colloidal metallic silver particles were identified by their characteristic plasmon absorption at 1-10 s after the pulse. Colloidal particles are stable for hours in supercritical ethane. The particles are less than 10 nm in diameter. Their size was determined using transmission electron microscope after precipitation from the solution.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- DOE Contract Number:
- DE-AC02-06CH11357
- OSTI ID:
- 943017
- Report Number(s):
- ANL/CHM/JA-36721; JPCBFK; TRN: US201002%%508
- Journal Information:
- J. Phys. Chem. B, Vol. 105, Issue 5 ; Feb. 8, 2001; ISSN 1089-5647
- Country of Publication:
- United States
- Language:
- ENGLISH
Similar Records
Pulse radiolysis studies of solvated electrons in supercritical ethane with methanol as cosolvent.
Spectrophotometric observations of the adsorption of organosulfur compounds on colloidal silver nanoparticles.