title: Shape-directional growth of Pt and Pd nanoparticles.
abstract: The design and synthesis of shape-directed nanoscale noble metal particles have attracted much attention due to their enhanced catalytic properties and the opportunities to study fundamental aspects of nanoscale systems. As such, numerous methods have been developed to synthesize crystals with tunable shapes, sizes, and facets by adding foreign species that promote or restrict growth on specific sites. Many hypotheses regarding how and why certain species direct growth have been put forward, however there has been no consensus on a unifying mechanism of nanocrystal growth. Herein, we develop and demonstrate the capabilities of a mathematical growth model for predicting metal nanoparticle shapes by studying a well known procedure that employs AgNO3 to produce {111} faceted Pt nanocrystals. The insight gained about the role of auxiliary species is then utilized to predict the shape of Pd nanocrystals and to corroborate other shape-directing syntheses reported in literature. The fundamental understanding obtained herein by combining modeling with experimentation is a step toward computationally guided syntheses and, in principle, applicable to predictive design of the growth of crystalline solids at all length scales (nano to bulk).
authors.affiliation: Department of Chemistry and Geochemistry, Colorado School of Mines, Golden, Colorado 80401, USA. rrichard@mines.edu.
authors.forename: G Jeremy
authors.initials: GJ
authors.lastname: Leong
authors.forename: Abbas
authors.initials: A
authors.lastname: Ebnonnasir
authors.forename: Maxwell C
authors.initials: MC
authors.lastname: Schulze
authors.forename: Matthew B
authors.initials: MB
authors.lastname: Strand
authors.forename: Chilan
authors.initials: C
authors.lastname: Ngo
authors.forename: David
authors.initials: D
authors.lastname: Maloney
authors.forename: Sarah L
authors.initials: SL
authors.lastname: Frisco
authors.forename: Huyen N
authors.initials: HN
authors.lastname: Dinh
authors.forename: Bryan
authors.initials: B
authors.lastname: Pivovar
authors.forename: George H
authors.initials: GH
authors.lastname: Gilmer
authors.forename: Suneel
authors.initials: S
authors.lastname: Kodambaka
authors.forename: Cristian V
authors.initials: CV
authors.lastname: Ciobanu
authors.forename: Ryan M
authors.initials: RM
authors.lastname: Richards