Istituto Italiano di Tecnologia, Via Morego 30, 16163 Genova, Italy.
Nano Lett. 2010 Sep 8;10(9):3770-6. doi: 10.1021/nl102539a.
The growth behavior of cadmium chalcogenides (CdE = CdS, CdSe, and CdTe) on sphalerite Cu(2-x)Se nanocrystals (size range 10-15 nm) is studied. Due to the capability of Cu(2-x)Se to undergo a fast and quantitative cation exchange reaction in the presence of excessive Cd(2+) ions, no Cu(2-x)Se/CdE heterostructures are obtained and instead branched CdSe/CdE nanocrystals are built which consist of a sphalerite CdSe core and wurtzite CdE arms. While CdTe growth yields multiarmed structures with overall tetrahedral symmetry, CdS and CdSe arm growth leads to octapod-shaped nanocrystals. These results differ significantly from literature findings about the growth of CdE on sphalerite CdSe particles, which until now had always yielded tetrapod-shaped nanocrystals.
碲化镉（CdE=CdS、CdSe 和 CdTe）在闪锌矿 Cu(2-x)Se 纳米晶体（尺寸范围 10-15nm）上的生长行为得到了研究。由于 Cu(2-x)Se 在过量 Cd(2+)离子存在下能够快速进行定量的阳离子交换反应，因此没有得到 Cu(2-x)Se/CdE 异质结构，而是构建了分支的 CdSe/CdE 纳米晶体，由闪锌矿 CdSe 核和纤锌矿 CdE 臂组成。虽然 CdTe 生长得到具有整体四面体对称性的多臂结构，但 CdS 和 CdSe 臂生长导致八足形纳米晶体。这些结果与关于 CdE 在闪锌矿 CdSe 颗粒上生长的文献发现有很大不同，迄今为止，CdE 在闪锌矿 CdSe 颗粒上的生长一直产生四足形纳米晶体。
