Nano Archive

In situ growth of silver nanoparticles in mesoporous silica by spray pyrolysis

Ahn, Ki Woong and Lim, Je Young and Yang, Ji Hye and Kim, Sun-Geon (2010) In situ growth of silver nanoparticles in mesoporous silica by spray pyrolysis. Journal of Nanoparticle Research, 12 (7). pp. 2457-2465.

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Abstract

Silver-dispersed mesoporous silica was in situ synthesized in aerosol phase. The solidification of silica was catalyzed in the presence of the silver, which increased the order and d values of the mesophase at given reactor temperature. Silver nanoparticles grew confined in the pores when the atomic % of silver to Si was below 10 and the pore wall turned to be impermeable above 400 °C. Silver permeated through the pore wall below 400 °C to grow freely in the carrier gas. The mesophase deteriorated using spray pyrolysis above 800 °C due to the further densification of silica, or above 10 at.% of silver due to the excessive growth within the phase. The highest dispersion of silver ~4 nm in diameter with the highest order of the mesoporosity was obtained at 600 °C with 5 at.% silver. Calcination following the spray pyrolysis further densified the silica phase to freeze the growth of silver particles as well as lower the d value of the mesophase.

Item Type:Article
Uncontrolled Keywords:Mesoporous silica - Silver dispersed - Aerosols - Spray pyrolysis - In situ synthesis
Subjects:Material Science > Functional and hybrid materials
Material Science > Nanofabrication processes and tools
Material Science > Nanochemistry
ID Code:9577
Deposited By:Lesley Tobin
Deposited On:30 Aug 2010 12:56
Last Modified:30 Aug 2010 12:56

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