Facile synthesis of monodispersed Au nanoparticles-coated on Stoeber silica

The homogeneous and tiny colloidal gold nanoparticles (2a4 nm) were utilized as the precursor and coated onto the non-porous Stoeber silica by a facile method. For the first time, the coating process is fulfilled without either organosilanes or thiols compounds, which was invariably applied for Stoe...

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Bibliographic Details
Published in:Colloids and surfaces. A, Physicochemical and engineering aspects Physicochemical and engineering aspects, 2013-05, Vol.425, p.83-91
Main Authors: Luo, Jingjie, Chu, Wei, Sall, Secou, Petit, Corinne
Format: Article
Language:English
Subjects:
Calcination
Catalysis
Coating
Gold
Nanoparticles
Polyvinyl alcohols
Silicon dioxide
Synthesis
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Summary:The homogeneous and tiny colloidal gold nanoparticles (2a4 nm) were utilized as the precursor and coated onto the non-porous Stoeber silica by a facile method. For the first time, the coating process is fulfilled without either organosilanes or thiols compounds, which was invariably applied for Stoeber silica to fix the gold particles and thus limited the application of the gold material in catalysis field. For better understanding, the mechanism of the synthesis process was further analyzed. During the coating process, the gold nanoparticles protected by polyvinyl alcohol (PVA) surrounded with hydroxyl species were higher dispersed on the surface of Stoeber silica. The following calcination facilitated the combining removal of hydroxyl species in both PVA and silica structure, and the gold nanoparticles anchored by residual hydroxyl species on the surface of Stoeber silica. Major of the small particles about 3 nm remained their sizes even after calcination, which was just the satisfied size for some reactions such as CO oxidation. This simple and environmental synthesis method provided an available strategy for synthesizing gold catalysts with very small and orderly sizes that can be used for further investigation in the catalysis field.
ISSN:0927-7757
DOI:10.1016/j.colsurfa.2013.02.056