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Annealing of mesoporous silica loaded with silver nanoparticles within its pores from isothermal sorption

Published online by Cambridge University Press:  31 January 2011

Weiping Cai ,
Lide Zhang ,
Huicai Zhong  and
Guoliang He
Weiping Cai
Affiliation:
Institute of Solid State Physics, Academia Sinica, Hefei 230031, People's Republic of China, and Institute of Advanced Study, University of Science and Technology of China, Hefei, People's Republic of China
Lide Zhang
Affiliation:
Institute of Solid State Physics, Academia Sinica, Hefei 230031, People's Republic of China, and Institute of Advanced Study, University of Science and Technology of China, Hefei, People's Republic of China
Huicai Zhong
Affiliation:
Institute of Solid State Physics, Academia Sinica, Hefei 230031, People's Republic of China
Guoliang He
Affiliation:
Institute of Solid State Physics, Academia Sinica, Hefei 230031, People's Republic of China
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Abstract

Influences of annealing on the structure of mesoporous silica loaded with silver (Ag) nanoparticles, and on the coarsening of Ag particles within pores of the host were investigated from isothermal sorption. Doping a small amount of Ag nanoparticles into pores of silica and subsequent annealing decreases the measured values of specific surface area and pore volume of porous silica significantly. This is attributed to the presence and coarsening of Ag particles within pores or channels between pores, which result in more and more isolated and unmeasured free spaces. The measured value of a specific surface area for the doped samples cannot represent the real value, which is, in fact, unable to be measured directly. During additional annealing, Ag particles within silica coarsen mainly according to the mechanism of formation of Ag adatoms on pore wall and diffusion of the adatoms along with pore walls. Only the larger particles located in the larger pores can continuously grow. The smaller particles and those located in the channels or pores with smaller dimension will disappear. The activation energy of the ripening process was estimated to be about 0.60 eV, and the migration barrier of Ag adatom on the pore wall of silica is about 0.10 eV.

Type
Articles
Information
Journal of Materials Research , Volume 13 , Issue 10 , October 1998 , pp. 2888 - 2895
Copyright
Copyright © Materials Research Society 1998

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