Nanosecond probing of the early nucleation steps of silver atoms in colloidal zeolite by pulse radiolysis and flash photolysis techniques

Z. Tahri (1) , F. Luchez (2, 3) , I. Yordanov (4) , O. Poizat (2, 3) , A. Moissette (2, 3) , V. Valtchev (4) , S. Mintova (4) , M. Mostafavi (1) , V. de Waele (1)

1 LCPO - Laboratoire de Chimie Physique D'Orsay
2 LASIRE - Laboratoire Avancé de Spectroscopie pour les Intéractions la Réactivité et l'Environnement - UMR 8516
3 CERLA - Centre d'Etudes et de Recherches Lasers et Applications
4 LMPC - Laboratoire de Matériaux à Porosité Contrôlée

The process of formation and the subsequent aggregation of silver atoms (Ag⁰) in nanosized zeolite beta (BEA) are studied by transient absorption spectroscopy. The zeolite nanocrystals are stabilized in aqueous colloidal suspensions with a narrow particle size distribution in the range 30–60 nm. The reduction of silver cations is initiated either by pulse radiolysis of the aqueous suspension or by photoinduced electron transfer using an organic electron donor adsorbed in the zeolite framework. The silver atom in BEA nanosized crystals is found to be stable on the microsecond timescale.

Mots clés: Silver aggregates; Nanosized zeolite beta; Transient absorption spectroscopy; Radiolysis; Photolysis

Domaines: Chimie-Physique [physics.chem-ph]

Z. Tahri, F. Luchez, I. Yordanov, O. Poizat, A. Moissette, et al.. Nanosecond probing of the early nucleation steps of silver atoms in colloidal zeolite by pulse radiolysis and flash photolysis techniques. Research on Chemical Intermediates, 2009, 35, pp.379-388. ⟨10.1007/s11164-009-0049-1⟩. ⟨hal-00421906⟩