TY - JOUR
T1 - Origin and shape evolution of core-shell nanoparticles in Au-Pd
T2 - From few atoms to high Miller index facets
AU - Bhattarai, Nabraj
AU - Casillas, Gilberto
AU - Khanal, Subarna
AU - Salazar, J. Jesus Velazquez
AU - Ponce, Arturo
AU - Jose-Yacaman, Miguel
N1 - Funding Information:
Acknowledgments This project was supported by grants from the National Center for Research Resources (5 G12RR013646-12) and the National Institute on Minority Health and Health Disparities (G12MD007591) from the National Institutes of Health. The authors would like to acknowledge to the NSF for support with grants DMR-1103730, ‘‘Alloys at the Nanoscale: The Case of Nanoparticles Second Phase and PREM’’: NSF PREM Grant # DMR 0934218; ‘‘Oxide and Metal Nanoparticles—The Interface Between Life Sciences and Physical Sciences.’’
PY - 2013/6
Y1 - 2013/6
N2 - Au-Pd core-shell nanocubes and triangular nanoparticles were systematically synthesized from a few Pd layers up to fully grown morphologies by a modified seed-mediated growth method. The shape evolution of Au-Pd core-shell nanoparticles from single crystal and singly twinned seed to final concave nanocube and triangular plates are presented at atomic level by Cs-corrected scanning transmission electron microscopy (STEM). The growth mechanism of both morphologies was studied throughout different sizes. It was found that the concave nanocubes grew from octahedral Au seeds due to fast growth along 〈111〉; directions; while the triangular nanoparticles grew from singly twinned Au seeds, growing twice as fast in 〈110〉 directions along the twin boundary; compared to the 〈111〈 direction perpendicular to the twin boundary. Both the concave nanocubes and triangular nanoparticles presented high index facet (HIF) surfaces that will increase the catalytic activity of different reactions.
AB - Au-Pd core-shell nanocubes and triangular nanoparticles were systematically synthesized from a few Pd layers up to fully grown morphologies by a modified seed-mediated growth method. The shape evolution of Au-Pd core-shell nanoparticles from single crystal and singly twinned seed to final concave nanocube and triangular plates are presented at atomic level by Cs-corrected scanning transmission electron microscopy (STEM). The growth mechanism of both morphologies was studied throughout different sizes. It was found that the concave nanocubes grew from octahedral Au seeds due to fast growth along 〈111〉; directions; while the triangular nanoparticles grew from singly twinned Au seeds, growing twice as fast in 〈110〉 directions along the twin boundary; compared to the 〈111〈 direction perpendicular to the twin boundary. Both the concave nanocubes and triangular nanoparticles presented high index facet (HIF) surfaces that will increase the catalytic activity of different reactions.
KW - Core-shell nanostructure
KW - Cs-corrected scanning transmission electron microscopy
KW - Growth mechanism
KW - High index facet surfaces
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U2 - 10.1007/s11051-013-1660-z
DO - 10.1007/s11051-013-1660-z
M3 - Article
AN - SCOPUS:84876850588
SN - 1388-0764
VL - 15
JO - Journal of Nanoparticle Research
JF - Journal of Nanoparticle Research
IS - 6
M1 - 1660
ER -