期刊
NANO LETTERS
卷 11, 期 7, 页码 2912-2918出版社
AMER CHEMICAL SOC
DOI: 10.1021/nl201386e
关键词
Pt3Ni nanoctahedra; self-assembly; low packing density; bcc; TEM tomography; GISAXS
类别
资金
- NSF [DMR-0731382]
- NSF & NIH/NIGMS via NSF [DMR-0936384]
We present a structural study of Pt3Ni nanoctahedron superlattice, prepared through both drop-casting and controlled solvent evaporation approaches. In this superlattice system containing similar to 10.6 nm side-length Pt3Ni nanoctahedra, we observed a body-centered cubic (bcc) packing structure in both local superlattices and statistically averaged superlattice ensembles using transmission electron microscopic tomography and grazing-incidence small-angle X-ray scattering techniques, respectively. Within the superstructure, it was directly observed that nanoctahedra are orientated along the superstructure axes through sharing their vertices. We found that this arrangement of a bcc superstructure with nanoctahedra connecting through their vertices is dependent on neither the processing pathway nor the substrate under our experimental conditions. With such a very low packing density and ultrahigh surface area, this type of self-organized superstructure possesses unique features for future applications.
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