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Title: Facet selective etching of Au microcrystallites
Authors: Mettela, Gangaiah
Kulkarni, G. U.
Keywords: Physical Chemistry
Nanoscience & Nanotechnology
Materials Science
Applied Physics
facet selective etching
Shape-Controlled Synthesis
Gold Nanorods
Directed Oxidation
Issue Date: 2015
Publisher: Tsinghua Univ Press
Citation: Nano Research
Mettela, G.; Kulkarni, G. U., Facet selective etching of Au microcrystallites. Nano Research 2015, 8 (9), 2925-2934.
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 O-2/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.
Description: Restricted access
ISSN: 1998-0124
Appears in Collections:Research Articles (Kulkarni, G. U.)

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