Please use this identifier to cite or link to this item: https://doi.org/10.1038/s41467-017-01175-2
Title: Direct observation of the nanoscale Kirkendall effect during galvanic replacement reactions
Authors: Chee, S.W 
Tan, S.F 
Baraissov, Z 
Bosman, M 
Mirsaidov, U 
Keywords: gold
nanomaterial
silver
cation
chemical reaction
electrochemical method
gold
nanoparticle
oxidation
temperature profile
void
Article
cell transport
chemical reaction
galvanic current
galvanic replacement
nanoanalysis
oxidation
structure analysis
temperature
transmission electron microscopy
Issue Date: 2017
Publisher: Nature Publishing Group
Citation: Chee, S.W, Tan, S.F, Baraissov, Z, Bosman, M, Mirsaidov, U (2017). Direct observation of the nanoscale Kirkendall effect during galvanic replacement reactions. Nature Communications 8 (1) : 1224. ScholarBank@NUS Repository. https://doi.org/10.1038/s41467-017-01175-2
Abstract: Galvanic replacement (GR) is a simple and widely used approach to synthesize hollow nanostructures for applications in catalysis, plasmonics, and biomedical research. The reaction is driven by the difference in electrochemical potential between two metals in a solution. However, transient stages of this reaction are not fully understood. Here, we show using liquid cell transmission electron microscopy that silver (Ag) nanocubes become hollow via the nucleation, growth, and coalescence of voids inside the nanocubes, as they undergo GR with gold (Au) ions at different temperatures. These direct in situ observations indicate that void formation due to the nanoscale Kirkendall effect occurs in conjunction with GR. Although this mechanism has been suggested before, it has not been verified experimentally until now. These experiments can inform future strategies for deriving such nanostructures by providing insights into the structural transformations as a function of Au ion concentration, oxidation state of Au, and temperature. © 2017 The Author(s).
Source Title: Nature Communications
URI: https://scholarbank.nus.edu.sg/handle/10635/174391
ISSN: 2041-1723
DOI: 10.1038/s41467-017-01175-2
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