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@ARTICLE{Gan:188154,
author = {Gan, L. and Cui, C. and Heggen, M. and Dionigi, F. and
Rudi, S. and Strasser, P.},
title = {{E}lement-specific anisotropic growth of shaped platinum
alloy nanocrystals},
journal = {Science},
volume = {346},
number = {6216},
issn = {1095-9203},
address = {Washington, DC [u.a.]},
publisher = {American Association for the Advancement of Science64196},
reportid = {FZJ-2015-01615},
pages = {1502 - 1506},
year = {2014},
abstract = {Morphological shape in chemistry and biology owes its
existence to anisotropic growth and is closely coupled to
distinct functionality. Although much is known about the
principal growth mechanisms of monometallic shaped
nanocrystals, the anisotropic growth of shaped alloy
nanocrystals is still poorly understood. Using
aberration-corrected scanning transmission electron
microscopy, we reveal an element-specific anisotropic growth
mechanism of platinum (Pt) bimetallic nano-octahedra where
compositional anisotropy couples to geometric anisotropy. A
Pt-rich phase evolves into precursor nanohexapods, followed
by a slower step-induced deposition of an M-rich (M = Ni,
Co, etc.) phase at the concave hexapod surface forming the
octahedral facets. Our finding explains earlier reports on
unusual compositional segregations and chemical degradation
pathways of bimetallic polyhedral catalysts and may aid
rational synthesis of shaped alloy catalysts with desired
compositional patterns and properties.},
cin = {PGI-5},
ddc = {500},
cid = {I:(DE-Juel1)PGI-5-20110106},
pnm = {42G - Peter Grünberg-Centre (PG-C) (POF2-42G41)},
pid = {G:(DE-HGF)POF2-42G41},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000346536500061},
pubmed = {pmid:25525243},
doi = {10.1126/science.1261212},
url = {https://juser.fz-juelich.de/record/188154},
}