期刊
ACS NANO
卷 10, 期 8, 页码 7689-7695出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.6b03020
关键词
galvanic replacement; nanoparticle growth; in situ TEM; growth kinetics; reaction dynamics
类别
资金
- National Research Foundation, Prime Minister's Office, Singapore
- National Research Foundation (NRF) under the CRP program
- Ministry of Education of Singapore [NRF-CRP 8-2011-07, MOE2015-T2-1-007]
We study the galvanic replacement reaction of silver nanocubes in dilute, aqueous ethylenediaminetetraacetic acid disodium salt (EDTA)-capped gold aurate solutions using in situ liquid-cell electron microscopy. Au/Ag etched nanostructures with concave faces are formed via (1) etching that starts from the faces of the nanocubes, followed by (2) the deposition of an Au layer as a result of galvanic replacement, and (3) Au deposition via particle coalescence and monomer attachment where small nano particles are formed during the reaction as a result of radiolysis. Analysis of the Ag removal rate and Au deposition rate provides a quantitative picture of the growth process and shows that the morphology and of the final product are dependent on the stoichiometric ratio between Au and Ag.
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