Alkyl Chains of Surface Ligands Affect Polytypism of CdSe Nanocrystals and Play an Important Role in the Synthesis of Anisotropic Nanoheterostructures
Alkyl Chains of Surface Ligands Affect Polytypism of CdSe Nanocrystals and Play an Important Role in the Synthesis of Anisotropic Nanoheterostructures
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DOI：
10.1021/ja105132u
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发表时间：
2010-11-17
影响因子：
15
通讯作者：
Talapin, Dmitri V.
中科院分区：
文献类型：
--
作者：
Huang, Jing;Kovalenko, Maksym V.;Talapin, Dmitri V.
我们发现，表面配体的烷基链长可以改变纤锌矿和闪锌矿纳米晶之间的平衡。原位广角X射线散射测量表明，短链(如丙基)膦酸以闪锌矿相稳定CdSe纳米晶，而十八烷基膦酸以纤锌矿相稳定纳米晶。我们还展示了如何利用这一效应来提高各向异性CdSe/CDS和ZnSe/CDS纳米异质结的形状选择性。
We show that the length of the alkyl chain of surface ligands can shift the equilibrium between the wurtzite and zinc blende polytypes of CdSe nanocrystals. In-situ wide-angle X-ray scattering measurements reveal that short-chain (e.g., propyl) phosphonic acids stabilize CdSe nanocrystals with the zinc blende phase whereas octadecylphosphonic acid stabilize nanocrystals with the wurtzite phase. We also demonstrate how this effect can be used to improve the shape selectivity in the synthesis of anisotropic CdSe/CdS and ZnSe/CdS nanoheterostructures.