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3D structure-preserving galvanic replacement to create hollow Au microstructures

Abstract

This is the first time to present 3D complex hollow Au microstructures (HL-AuMSs) fabricated via 3D structure-preserving galvanic replacement approach. 3D nanoporous Ag microstructures (np-AgMSs) are employed as templates, which are galvanically replaced by Au3+ under extremely high Cl- environments. During this galvanic replacement process, insoluble AgCl species, which is a surface blocking, is transformed under extremely high Cl- environments into water soluble AgCl2- complex, which is easily liberated from a Ag surface. Therefore, chloride ion is the key parameter in 3D morphological preservation of these templates. The preferential galvanic replacement is observed at the tips of np-AgMSs templates due to high charge density. The wall thickness of HL-AuMSs can be easily controlled by varying the mole ratio of Au3+:Ag. This 3D structure-preserving galvanic replacement is not only applied for various morphologies of Ag templates, but also applied for other precious metals with excellent template morphology retention. Moreover, due to this stabilizer-free protocol, the fabricated HL-AuMSs show the efficient catalytic activity for the reduction of p-nitrophenol by NaBH4 within 10 minutes for 6 cycles.

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Publication details

The article was received on 10 Mar 2017, accepted on 14 Jun 2017 and first published on 14 Jun 2017


Article type: Paper
DOI: 10.1039/C7CE00484B
Citation: CrystEngComm, 2017, Accepted Manuscript
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    3D structure-preserving galvanic replacement to create hollow Au microstructures

    H. Gatemala, S. Ekgasit and P. Pienpinijtham, CrystEngComm, 2017, Accepted Manuscript , DOI: 10.1039/C7CE00484B

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