ICT2014 Abstracts

We present a structural of PbTe nanocube prepared through both drop-casting and controlled solvent evaporation approaches，as well as the associated mechanisms of their crystallization and growth in ~15 nm PbTe nanocube. The crystallinity, shape/size distributions and structural characteristics were carefully studied using Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) TEM, respectively. In this system containing~15.0nm side-length PbTe nanocube, we observed a face centered cubic (fcc) packing structure in both local superlattices and statistically averaged superlattice ensembles. The insight into ligand−solvent interactions gained from this work represents a piece of new information, which will further promote our understanding of the formation mechanisms in the self-assembly of non-spherical PbTe NPs. A plausible growth mechanism for assembly PbTe is proposed. Detailed translational and orientational characteristics of these superstructures were determined using a TEM with 3D reconstruction analysis. We found that this arrangement of a fcc superstructure connected through their face. This new type of superstructure consisting of nanocube as epitaxy-like interfaces, reported here for the first time, is considered the most stable surfactant –capped nanocube superstructure determined by far. As a kind of epitaxy-like interfaces of Bi_2-xSb_xTe₃, the bulk composite materials according to proper proportion was made by the Spark Plasma Sintering, the characteristics of these superstructures were determined using a SEM.