Hierarchic Nanostructuring by Self-Reduction of Silver (I) Oxide Complexesстатья
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Дата последнего поиска статьи во внешних источниках: 26 сентября 2016 г.
Аннотация:Silver nanoparticles superficially decorated with hierarchically smaller nanoparticles
are obtained for the first time in the course of ageing of silver globules in aerated
aqueous ammonia. The process is caused at the beginning by gentle etching of
metallic silver across extended defects and smoothing of their edges with oxygen
dissolved in aqueous ammonia due to silver (I) stabilization within a soluble ammonia
complex for a 1-2 day incubation period, then the complex accumulates as an
intermediate product and gradually decays into nanosilver because of the ligand loss
for the remaining 4 - 5 days. The as-formed metallic silver deposits onto larger silver
particles heterogeneously decorating their surface; this broadens the initial plasmonic
peak and causes a weak red shift because of nanostructuring. The latter makes a
substantial contribution to the overall optical properties of the nanoparticles of a
complex morphology and has to be considered as an important factor affecting optical
characteristics of nanoparticle ensembles and their possible plasmonic applications.