Stable Silver Nanoparticles Immobilized in Mesoporous Silica
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- 作者：Virginie Hornebecq ; Markus Antonietti ; Thierry Cardinal ; and Mona Treguer-Delapierre
- 刊名：Chemistry of Materials
- 出版年：2003
- 出版时间：May 20, 2003
- 年：2003
- 卷：15
- 期：10
- 页码：1993 - 1999
- 全文大小：161K
- 年卷期：v.15,no.10(May 20, 2003)
- ISSN：1520-5002
文摘
Silver nanoparticles have been produced by 
-irradiation of silver solution in opticallytransparent inorganic mesoporous silica. The reduction of Ag+ within the matrix is broughtabout by hydrated electrons and hydroalkyl radicals generated during the radiolysis of the2-propanol solution. The particles formed within the silica matrix were studied by electronmicroscopy, nitrogen sorption measurements, and absorption spectroscopy. The particleswere mostly confined and dispersed in the pores of the mesoporous hosts. Absorption spectrashow that the mean Ag clusters size increases with the irradiation dose. At high dose,agglomerated large particles are formed. In contrast, at a given dose, the effect of the doserate has been clearly demonstrated to lower the cluster size. The silver particles within thesilica matrix are stable in the presence of oxygen for at least several months.
-irradiation of silver solution in opticallytransparent inorganic mesoporous silica. The reduction of Ag+ within the matrix is broughtabout by hydrated electrons and hydroalkyl radicals generated during the radiolysis of the2-propanol solution. The particles formed within the silica matrix were studied by electronmicroscopy, nitrogen sorption measurements, and absorption spectroscopy. The particleswere mostly confined and dispersed in the pores of the mesoporous hosts. Absorption spectrashow that the mean Ag clusters size increases with the irradiation dose. At high dose,agglomerated large particles are formed. In contrast, at a given dose, the effect of the doserate has been clearly demonstrated to lower the cluster size. The silver particles within thesilica matrix are stable in the presence of oxygen for at least several months.