Zinc Chalcogenide Seed-Mediated Synthesis of CdSe
Nanocrystals: Nails, Chesses and Tetrahedrons
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Abstract
Systematically
shape-controlled synthesis of colloidal semiconductor
nanocrystals (NCs) has attracted increasing attention recently for
both fundamental and technological interest. The study on the synthesis
of colloidal CdSe NCs has given rise to well-developed methods for
producing diverse shapes such as rods, wires, cubs and discs. In the
current study, we demonstrate the shape evolution of CdSe NCs by using
a seed-mediated approach by control reaction temperature and injection
methods. The synthesis utilizes small (2.0β3.0 nm) zinc chalcogenide
NCs with zincblende structure as seeds for subsequent growth, which
results in distinct shapes of nail-shaped, tetrahedron-shaped, chess
piece-shaped, and Y-shaped CdSe NCs with high yield and good uniformity.
The morphologies and crystal structures of the prepared CdSe NCs were
well characterized by transmission electron microscopy (TEM), high
resolution TEM, and X-ray diffraction measurements. This wide variation
of shapes provides important information on the growth of CdSe NCs
and promotes the shape-controlled synthesis of other NCs by seed-mediated
synthetic method