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Issue 27, 2017
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3D structure-preserving galvanic replacement to create hollow Au microstructures

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Abstract

For the first time, 3D complex hollow Au microstructures (HL-AuMSs) fabricated via a 3D structure-preserving galvanic replacement approach are presented. 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 surface blocking AgCl species, is transformed under extremely high Cl environments into a water soluble AgCl2 complex, which is easily liberated from the Ag surface. Therefore, chloride ion is the key parameter in the 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 efficient catalytic activity for the reduction of p-nitrophenol by NaBH4 within 10 minutes for 6 cycles.

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

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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, 2017,19, 3808-3816
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    3D structure-preserving galvanic replacement to create hollow Au microstructures

    H. Gatemala, S. Ekgasit and P. Pienpinijtham, CrystEngComm, 2017, 19, 3808
    DOI: 10.1039/C7CE00484B

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