Key words: supercritical fluid impregnation, porous glass, synthetic opal, silver nanoparticles, plasmon resonance
Silver-containing nanocomposites are fabricated by impregnation of Vycor glass (4 nm
pore diameter) and synthetic opals (40 nm interstice size) with Ag(hfac)COD
(cyclooctadiene complex of silver hexafluoroacetylacetonate) silver precursor dissolved
in supercritical carbon dioxide, and studied with optical absorption spectroscopy, atomic
force microscopy and electron spin resonance (ESR) technique. Plasmon resonances
of Ag nanoparticles at 420-430 nm were revealed for Ag(hfac)COD impregnated
Vycor glass and opal matrixes after thermal treatment on air at temperatures above
50 °C. Shapes of plasmon resonances for both types of samples are conditioned by the
morphology of their porous space in which silver nanoparticles are formed in the
course of thermal treatment after the SCF impregnation. Paramagnetic species Cu(hfac)2
(copper hexafluoroacetylacetonate) are used as spectroscopic probes for ESR
measurements of precursor distribution in Vycor glass and opal after their SCF
impregnation.
doi:10.1134/S1990793109070100