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https://hdl.handle.net/2440/88284
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Type: | Journal article |
Title: | Synthesis of self-supporting gold microstructures with three-dimensional morphologies by direct replication of diatom templates |
Author: | Yu, Y. Addai-Mensah, J. Losic, D. |
Citation: | Langmuir: the ACS journal of surfaces and colloids, 2010; 26(17):14068-14072 |
Publisher: | American Chemical Society |
Issue Date: | 2010 |
ISSN: | 0743-7463 1520-5827 |
Statement of Responsibility: | Yang Yu, Jonas Addai-Mensah and Dusan Losic |
Abstract: | Diatoms (unicellular algae) form porous silica walls (frustule) with intricate, hierarchically organized three-dimensional (3D) structures with micro- to nanoscale dimensions. This paper presents the fabrication of self-supporting gold microstructures with complex 3D morphologies by using electroless gold deposition onto a diatom silica substrate, followed by the substrate removal by acid dissolution. It was demonstrated that gold diatom replicas with distinct micro- to nanoscale structures can be created by a simple and scalable process based on electroless gold deposition. Excellent catalytic properties (catalytic rate constant k = 23.5 ± 1 × 10−2 min−1) of prepared gold replica catalysts were confirmed for the reduction process of 4-nitrophenol (4-NP) into 4-aminophenol (4-AP) in the presence of NaBH4 as the reductant. This synthetic approach is general and flexible, and it is envisaged that it can be applied for the preparation of a wide range of different metals (Pt, Pd, Ag, Ni, etc.) offering more efficient catalytic, optical, or magnetic properties. |
Keywords: | Diatoms Borohydrides Gold Silicon Dioxide Aminophenols Nitrophenols Oxidation-Reduction Catalysis Particle Size Surface Properties Porosity Metal Nanoparticles |
Rights: | © 2010 American Chemical Society |
DOI: | 10.1021/la102083t |
Grant ID: | http://purl.org/au-research/grants/arc/LP0989229 |
Published version: | http://dx.doi.org/10.1021/la102083t |
Appears in Collections: | Aurora harvest 7 Chemical Engineering publications |
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