Title
Au@Ag nanoparticles : halides stabilize {100} facetsAu@Ag nanoparticles : halides stabilize {100} facets
Author
Faculty/Department
Faculty of Sciences. Physics
Research group
Electron microscopy for materials research (EMAT)
Publication type
article
Publication
Washington, D.C :American Chemical Society,
Subject
Physics
Chemistry
Engineering sciences. Technology
Source (journal)
The journal of physical chemistry letters / American Chemical Society. - Washington, D.C, 2010, currens
Volume/pages
4(2013):13, p. 2209-2216
ISSN
1948-7185
ISI
000321809500018
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
Seed-mediated growth is the most efficient methodology to control the size and shape of colloidal metal nanoparticles. In this process, the final nanocrystal shape is defined by the crystalline structure of the initial seed as well as by the presence of ligands and other additives that help to stabilize certain crystallographic facets. We analyze here the growth mechanism in aqueous solution of silver shells on presynthesized gold nanoparticles displaying various well-defined crystalline structures and morphologies. A thorough three-dimensional electron microscopy characterization of the morphology and internal structure of the resulting core-shell nanocrystals indicates that {100} facets are preferred for the outer silver shell, regardless of the morphology and crystallinity of the gold cores. These results are in agreement with theoretical analysis based on the relative surface energies of the exposed facets in the presence of halide ions.
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