An Obtuse Rhombohedral Superlattice Assembled by Pt Nanocubes.
We grew large single three-dimensional supercrystals from colloidal Pt nanocubes (NCs) suspended in hexane. A synchrotron-based two circle diffractometer was used to obtain an unprecedented level of detail from full sets of small/wide-angle X-ray scattering (SAXS/WAXS) patterns. Automatic indexing and simulations of X-ray patterns enabled detailed reconstruction of NC translation and shape orientation within the supercrystals from atomic to mesometric levels. The supercrystal has an obtuse rhombohedral (Rh) superlattice with space group R3m and a trigonal cell angle of 106.2°. Individual NCs orient themselves in a manner of atomic Pt[111] parallel to superlattice Rh[111]. We analyzed the superlattice structure in context of three spatial relationships of proximate NCs including face-to-face, edge-to-edge, and corner-to-corner configurations. Detailed analysis of supercrystal structure reveals nearly direct corner-to-corner contacts and a tight interlocking NC structure. We employed the correlations between strain and lattice distortion and established the first structural correlating mechanism between five superlattice polymorphs to elucidate the superlattice transformations and associated developing pathways. Together, the experimental and modeling results provide comprehensive structural information toward controlling design and efficient materials-processing for large fabrication of nanobased functional materials with tailored structures and desired properties.
Ruipeng
R
Li
Kaifu
K
Bian
Department of Chemistry, State University of New York at Binghamton , Binghamton, New York 13902, United States.
Yuxuan
Y
Wang
Hongwu
H
Xu
Jennifer A
JA
Hollingsworth
Tobias
T
Hanrath
Department of Chemistry, State University of New York at Binghamton , Binghamton, New York 13902, United States.
Jiye
J
Fang
Zhongwu
Z
Wang
D003461:Crystallography / Q000379:methods; D008958:Models, Molecular; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure*; D010984:Platinum / Q000737:chemistry*; D053838:Scattering, Small Angle; D014961:X-Ray Diffraction
D010984:Platinum
Pt nanocube; SAXS and WAXS; obtuse rhombohedral; self-assembly; supercrystallography; superlattice