期刊
NANOSCALE
卷 8, 期 22, 页码 11635-11641出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6nr02166b
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资金
- US National Science Foundation [NSF-CHEM-1213182, NSF-DMR-1207065]
- Cluster of Excellence RESOLV at the Ruhr-University Bochum - Deutsche Forschungsgemeinschaft [EXC 1069]
- Direct For Mathematical & Physical Scien
- Division Of Chemistry [1213182] Funding Source: National Science Foundation
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1207065] Funding Source: National Science Foundation
Thermodynamically stable shape-selected Pt and Pd nanoparticles (NPs) were synthesized via inverse micelle encapsulation and a subsequent thermal treatment in vacuum above 1000 degrees C. The majority of the Pd NPs imaged via scanning tunneling microscopy (STM) had a truncated octahedron shape with (111) top and interfacial facets, while the Pt NPs were found to adopt a variety of shapes. For NPs of identical shape for both material systems, the NP-support adhesion energy calculated based on STM data was found to be size-dependent, with large NPs (e.g. similar to 6 nm) having lower adhesion energies than smaller NPs (e.g. similar to 1 nm). This phenomenon was rationalized based on support-induced strain that for larger NPs favors the formation of lattice dislocations at the interface rather than a lattice distortion that may propagate through the smaller NPs. In addition, identically prepared Pt NPs of the same shape were found to display a lower adhesion energy compared to Pd NPs. While in both cases, a transition from a lattice distortion to interface dislocations is expected to occur with increasing NP size, the higher elastic energy in Pt leads to a lower transition size, which in turn lowers the adhesion energy of Pt NPs compared to Pd.
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