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Controlling Reduction Kinetics in the Galvanic Replacement Involving Metal Oxides Templates: Elucidating the Formation of Bimetallic Bowls, Rattles, and Dendrites from Cu 2 O Spheres
Author(s) -
Rodrigues Thenner S.,
da Silva Anderson G. M.,
Alves Rafael S.,
de Freitas Isabel C.,
Oliveira Daniela C.,
Camargo Pedro H. C.
Publication year - 2018
Publication title -
particle and particle systems characterization
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.877
H-Index - 56
eISSN - 1521-4117
pISSN - 0934-0866
DOI - 10.1002/ppsc.201700175
Subject(s) - bimetallic strip , metal , galvanic cell , kinetics , materials science , oxide , template , nanoparticle , chemical engineering , inorganic chemistry , nanotechnology , chemistry , metallurgy , engineering , quantum mechanics , physics
This study demonstrates that the precursor reduction kinetics can be employed to control the morphology and composition of bimetallic metal/metal oxides systems obtained by galvanic replacement reaction using metal oxides as sacrificial templates. This work investigated Cu 2 O as a proof‐of‐concept example, in which the relative rates of Cu 2 O oxidation by O 2 and by noble metal precursors determined the morphology and composition of the products. We focused on three metal precursors with fast, medium, and slow reduction kinetics in the presence of Cu 2 O under aerobic conditions:PdCl 4 2 –,AuCl 4 – , and Ru 3+ , respectively. It was found that metal‐oxide‐based bowls, rattles, or dendrites can be obtained by simply changing the precursor reduction kinetics. These results provide novel insights over the versatility and mechanistic understanding of galvanic replacement to the synthesis of metal/metal‐oxide bimetallic nanoparticles.