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Facet selective etching of Au microcrystallites

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Abstract

High-symmetry crystals exhibit isotropic properties. Inducing anisotropy, e.g., by facet selective etching, is considered implausible in face-centered cubic (FCC) metals, particularly gold, which, in addition to being an FCC, is noble. We report for the first time the facet selective etching of Au microcrystals obtained in the form of cuboctahedra and pentagonal rods from the thermolysis of a goldorganic precursor. The selective etching of {111} and {100} facets was achieved using a capping method in which tetraoctylammonium cations selectively cap the {111} facets while Br– ions protect the {100} facets. The exposed facets are oxidized by O2/Cl–, yielding a variety of interesting geometries. The facet selective etching of the Au microcrystallites is governed only by the nature of the facets; the geometry of the microcystallite does not appear to play a significant role. The etched surfaces appear rough, but a closer examination reveals well-defined corrugations that are indexable to high hkl values. Such surfaces exhibit enhanced Raman activity.

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Authors and Affiliations

  1. Thematic Unit of Excellence on Nanochemistry and Chemistry and Physics of Materials Unit, Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR), Jakkur P.O., Bangalore, 560 064, India

    Gangaiah Mettela & Giridhar U. Kulkarni

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  1. Gangaiah Mettela
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  2. Giridhar U. Kulkarni
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Correspondence to Giridhar U. Kulkarni.

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Mettela, G., Kulkarni, G.U. Facet selective etching of Au microcrystallites. Nano Res. 8, 2925–2934 (2015). https://doi.org/10.1007/s12274-015-0797-8

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