Shaping metal nanocrystals through epitaxial seeded growth Page: 1 of 19
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Shaping binary metal nanocrystals through epitaxial seeded growth
Susan E. Habas,1, 2 Hyunjoo Lee,1,2 Velimir Radmilovic,2 Gabor A. Somorjai,1, 2 and Peidong Yang,2
1Department of Chemistry, University of California, Berkeley
Berkeley, CA 94720
2Materials Sciences Division, Lawrence Berkeley National Laboratory
1 Cyclotron Road, Berkeley, CA 94720
Email: p firstname.lastname@example.org
Morphological control of nanocrystals has become increasingly important, as many
of their physical and chemical properties are highly shape-dependent. Nanocrystal
shape control for both single and multiple material systems, however, remains fairly
empirical and challenging. New methods need to be explored for the rational
synthetic design of heterostructures with controlled morphology. Overgrowth of a
different material on well-faceted seeds, for example, allows for the use of the
defined seed morphology to control nucleation and growth of the secondary
structure. Here, we have used highly faceted cubic Pt seeds to direct the epitaxial
overgrowth of a secondary metal. We demonstrate this concept with lattice matched
Pd to produce conformal shape-controlled core-shell particles, and then extend it to
lattice mismatched Au to give anisotropic growth. Seeding with faceted nanocrystals
may have significant potential towards the development of shape-controlled
heterostructures with defined interfaces.
Heteroepitaxy in gas-phase deposition has been extensively studied for the development
of functional heterostructures and devices. The same degree of control is necessary to
fully realize the potential of heterostructure formation in solution. The majority of efforts
towards solution-phase heterostructure growth have focused on chalcogenide or oxide
interfaces, 7 or the integration of a metallic component with a chalcogenide or oxide
structure.- 5 Fully metallic heterostructures12, i6, 17 with controlled shape and interfaces
are less well studied.ig-21 Shape control of individual metallic nanoparticles, on the other
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Habas, Susan E.; Lee, Hyunjoo; Radmilovic, Velimir; Somorjai,Gabor A. & Yang, Peidong. Shaping metal nanocrystals through epitaxial seeded growth, article, February 17, 2008; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc896286/m1/1/: accessed November 17, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.