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Surface Segregated AgAu Tadpole‐Shaped Nanoparticles Synthesized Via a Single Step Combined Galvanic and Citrate Reduction Reaction
Author(s) -
da Silva Anderson G. M.,
Lewis Edward A.,
Rodrigues Thenner S.,
Slater Thomas J. A.,
Alves Rafael S.,
Haigh Sarah J.,
Camargo Pedro H. C.
Publication year - 2015
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201501704
Subject(s) - bimetallic strip , tadpole (physics) , galvanic cell , materials science , morphology (biology) , crystallite , nanoparticle , chemical engineering , nanocrystal , layer (electronics) , nanotechnology , metallurgy , geology , physics , paleontology , engineering , particle physics , metal
New AgAu tadpole nanocrystals were synthesized in a one‐step reaction involving simultaneous galvanic replacement between Ag nanospheres and AuCl 4 − (aq.) and AuCl 4 − (aq.) reduction to Au in the presence of citrate. The AgAu tadpoles display nodular polycrystalline hollow heads, while their undulating tails are single crystals. The unusual morphology suggests an oriented attachment growth mechanism. Remarkably, a 1 nm thick Ag layer was found to segregate so as to cover the entire surface of the tadpoles. By varying the nature of the seeds (Au NPs), double‐headed Au tadpoles could also be obtained. The effect of a number of reaction parameters on product morphology were explored, leading to new insights into the growth mechanisms and surface segregation behavior involved in the synthesis of bimetallic and anisotropic nanomaterials.