Abstract
The photoinduced formation and the subsequent early nucleation steps of silver atoms (Ag0) in nanosized zeolite Beta crystals stabilized in aqueous colloidal suspensions are studied by steady-state UV–Vis and Raman spectroscopy, and by transient absorption spectroscopy. The reduction of extra-framework silver cations is initiated by photoinduced electron transfer using organic electron donors such as N,N-diethylaniline or triphenylamine. The Ag0 species are formed in less than 100ns and are found to be stable for more than one microsecond before beginning to aggregate, leading first to Ag2+ species in ∼1.1μs. The data suggest that the reduction of extra-framework Ag+ arises only if the electron donor species is adsorbed on the zeolite particle surface or within the channels.
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