Journal
ACS NANO
Volume 7, Issue 1, Pages 645-653Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn3048439
Keywords
platinum; nanocrystal; shape control; morphology; catalysis; electrocatalysis; CO oxidation
Categories
Funding
- National Science Foundation MRSEC [DMR11-20901]
- Rachleff Scholars Program
- Office of Naval Research (ONR) Multidisciplinary University Research Initiative (MURI) on Optical Metamaterials [N00014-10-1-0942]
- U.S. Department of Energy, Office of Basic Energy Sciences [DE-AC02-98CH10886]
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Well-controlled synthesis of nanocrystals is necessary to unambiguously correlate the structural properties of nanocrystals with the catalytic properties. The most common low-index surfaces are (111) and (100). Therefore, model materials with {111} and {100} facets are highly desirable, in order to understand the catalytic properties of (111) and (100) surfaces for various structure-sensitive reactions. We report a solution-phase synthesis using metal carbonyls as additives. This synthetic method produces highly monodisperse Pt octahedra and icosahedra as the model of Pt{111}, Pt cubes as the model of Pt{100}, respectively. Several other morphologies, such as truncated cubes, cuboctahedra, spheres, tetrapods, star-shaped octapods, multipods, and hyper-branched structure, are produced, as well. A bifunctional role of metal carbonyl in the synthesis is identified: zerovalent transition metal decomposed from metal carbonyl acts as a shape-directing agent, while CO provides the reducing power. These high-quality shape-controlled Pt nanocrystals are suitable for model catalyst studies.
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