Synthesis of self-supporting gold microstructures with three-dimensional morphologies by direct replication of diatom templates

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dc.contributor.authorYu, Y.
dc.contributor.authorAddai-Mensah, J.
dc.contributor.authorLosic, D.
dc.date.issued2010
dc.description.abstractDiatoms (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.
dc.description.statementofresponsibilityYang Yu, Jonas Addai-Mensah and Dusan Losic
dc.identifier.citationLangmuir: the ACS journal of surfaces and colloids, 2010; 26(17):14068-14072
dc.identifier.doi10.1021/la102083t
dc.identifier.issn0743-7463
dc.identifier.issn1520-5827
dc.identifier.orcidLosic, D. [0000-0002-1930-072X]
dc.identifier.urihttp://hdl.handle.net/2440/88284
dc.language.isoen
dc.publisherAmerican Chemical Society
dc.relation.granthttp://purl.org/au-research/grants/arc/LP0989229
dc.rights© 2010 American Chemical Society
dc.source.urihttps://doi.org/10.1021/la102083t
dc.subjectDiatoms
dc.subjectBorohydrides
dc.subjectGold
dc.subjectSilicon Dioxide
dc.subjectAminophenols
dc.subjectNitrophenols
dc.subjectOxidation-Reduction
dc.subjectCatalysis
dc.subjectParticle Size
dc.subjectSurface Properties
dc.subjectPorosity
dc.subjectMetal Nanoparticles
dc.titleSynthesis of self-supporting gold microstructures with three-dimensional morphologies by direct replication of diatom templates
dc.typeJournal article
pubs.publication-statusPublished

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