期刊
JOURNAL OF PHYSICAL CHEMISTRY C
卷 119, 期 52, 页码 29178-29185出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcc.5b09980
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资金
- U.S. National Science Foundation [NSF-CHEM-1213182, NSF-DMR-1207065]
- Cluster of Excellence RESOLV at the Ruhr-University Bochum - Deutsche Forschungsgemeinschaft [EXC 1069]
- Danish National Research Foundation [DNRF54]
- Direct For Mathematical & Physical Scien
- Division Of Chemistry [1213182] Funding Source: National Science Foundation
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1207065] Funding Source: National Science Foundation
Colloidal chemistry, in combination with nanoparticle (NP)/support epitaxial interactions is used here to synthesize shape-selected and thermodynamically stable metallic NPs over a broad range of NP sizes. The morphology of three-dimensional palladium and platinum NPs supported on TiO2(110) was investigated using scanning tunneling microscopy. Well-defined Pd and Pt NPs were synthesized via inverse micelle encapsulation. The initially spherical NPs were found to become faceted and form an epitaxial relationship with the support after high-temperature annealing (e.g., 1100 degrees C). Shape selection was achieved for almost all Pd NPs, namely, a truncated octahedron shape with (111) top and interfacial facets. The Pt NPs were however found to adopt a variety of shapes. The epitaxial relationship of the NPs with the support was evidenced by the alignment of the cluster's edges with TiO2(110)-[001] atomic rows and was found to be responsible for the shape control. The ability of synthesizing thermally stable shape-selected metal NPs demonstrated here is expected to be of relevance for applications in the field of catalysis, since the activity and selectivity of NP catalysts has been shown to strongly depend on the NP shape.
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