Please use this identifier to cite or link to this item: http://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, 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
RMID: 0020127864
DOI: 10.1021/la102083t
Grant ID: http://purl.org/au-research/grants/arc/LP0989229
Appears in Collections:Chemical Engineering publications

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