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|Title:||Synthesis of self-supporting gold microstructures with three-dimensional morphologies by direct replication of diatom templates|
|Citation:||Langmuir, 2010; 26(17):14068-14072|
|Publisher:||American Chemical Society|
|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|
|Appears in Collections:||Chemical Engineering publications|
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