Abstract
Gold nanoparticulate films were generated under monolayers, prepared
from octadecyl mercaptan (1), N,N'dioctadecyl-N,N'-dithioethylammonium
bromide (2), and N,N'-dioctadecyl-N,N'-dimethylammonium bromide (3),
by the exposure of aqueous HAuCl4 to carbon monoxide and to steady-state
irradiation by a 150-W xenon lamp. Absorption spectrophotometric
and transmission electron microscopic investigations of the gold
particulate films, transferred to solid substrates, indicated the
marked influence of the surfactants used to form the monolayer. Those
prepared under monolayer 1 had a broad absorption maximum at 580
nm and diameters between 3 and 50 nm. Those formed under monolayer
2 were highly dense and had an absorption maximum at 564 nm. Gold
particles formed under monolayer 3 had a very narrow size distribution
with a mean diameter of 10 nm and had a broad absorption maximum
at 574 nm. Annealing the gold particulate films at high temperature
decreased their absorption bandwidth and shifted their maximum to
higher energy.
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