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Tree-like Ag nanostructures based on monolithic mesoporous silica

Published online by Cambridge University Press:  03 March 2011

Caixia Kan ,
Weiping Cai  and
Herbert Hofmeister
Caixia Kan
Affiliation:
Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, People’s Republic of China
Weiping Cai*
Affiliation:
Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, People’s Republic of China
Herbert Hofmeister
Affiliation:
Max Planck Institute of Microstructure Physics, D-06120 Halle, Germany
*
a) Address all correspondence to this author. e-mail: [email protected]
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Abstract

A novel tree-like nanostructured Ag crystal, with stems, branches, and leaves, has been synthesized by pre-forming Au seeds, soaking, and annealing, based on monolithic mesoporous silica. The obtained Ag nanotrees are of single-crystal nature and statistically symmetrical in geometry. Further experiments revealed that the interconnected channels of the porous silica, heating at low temperature, and the pre-formed Au seeds are crucial to form such structure. Its formation can be attributed to the low nucleation rate and preferentially unidirectional diffusion of Ag atoms to the Au seeds along interconnected channels. This nanostructured material is of great potential to be building blocks for assembling some mini-functional devices of the next generation. The current study is also of importance in studying the diffusion mechanism of single-crystal formation, and especially in improving our understanding of the underlying physical structure of both natural and synthetic porous materials.

Keywords

Crystal growthMorphologyMetal
Type
Articles
Information
Journal of Materials Research , Volume 19 , Issue 5 , May 2004 , pp. 1328 - 1332
Copyright
Copyright © Materials Research Society 2004

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