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Type: Artigo de periódico
Title: One-step preparation of silver nanoparticles confined in functionalized-free SBA-15 channels
Author: Maroneze, CM
da Costa, LP
Sigoli, FA
Gushikem, Y
Mazali, IO
Abstract: Supported Ag nanoparticles were successfully prepared by a one-step in situ procedure within channels of SBA-15 mesoporous silica. The reaction was carried out in N,N-dimethylformamide (DMF) at 25 C with no need for silica surface functionalization or demanding time-consuming steps, and presents important advantages over the usual method. The small-angle X-ray scattering (SAXS) pattern of SBA-15 presents well-defined reflections associated with P6mm hexagonal symmetry. TEM micrographs of supported Ag nanoparticles (SBA-15/Ag) clearly show the presence of spheroidal and elongated Ag nanoparticles that are confirmed by surface plasmon resonance band in the UV-vis absorption spectrum. No evidence of Ag nanoparticle agglomeration was observed throughout the inorganic matrix. Ag nanoparticle formation within channels of SBA-15 decreases its specific surface area and total pore volume, as evidenced by nitrogen adsorption-desorption isotherms, with no damage to the silica framework. The method shows itself to be very efficient, fast and convenient for the synthesis of supported Ag nanoparticles in SBA-15 channels. (C) 2010 Elsevier B.V. All rights reserved.
Subject: Mesoporous silica
Supported nanoparticles
Silver nanoparticles
Country: Suíça
Editor: Elsevier Science Sa
Rights: fechado
Identifier DOI: 10.1016/j.synthmet.2010.07.037
Date Issue: 2010
Appears in Collections:Unicamp - Artigos e Outros Documentos

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