Formation and stability of size-, shape-, and structure-controlled CdTe nanocrystals: Ligand effects on monomers and nanocrystals
Formation and stability of size-, shape-, and structure-controlled CdTe nanocrystals: Ligand effects on monomers and nanocrystals
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DOI：
10.1021/cm034729t
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发表时间：
2003-10
影响因子：
8.6
通讯作者：
W. Yu;Y. A. Wang;Xiaogang Peng
中科院分区：
文献类型：
--
作者：
W. Yu;Y. A. Wang;Xiaogang Peng
研究了在非配位溶剂中形成几乎单分散的CdTe纳米晶点(闪锌矿或纤锌矿晶体结构)、棒状和四脚的过程。观察到了几种较强的配位效应，发现单体上的配位效应比纳米晶上的配位效应起着更重要的作用。实验结果表明，与单体浓度相比，由于反应溶液中总是存在较强的配体，因此单体活性是理解纳米晶形成的一个更相关的术语。配体的成键强度和空间效应对单体的反应活性有很大影响，被认为是单体活度系数的贡献者。所制备的CdTe纳米晶的总体光学性能优于文献报道的结果，与标准的CdSe纳米晶体系相当。并对每个纳米晶表面配体的碳氢链构型进行了研究。
The formation of nearly monodisperse CdTe nanocrystalsdots (either zinc blende or wurtzite crystal structure), rods, and tetrapodsin a noncoordinating solvent was studied. Several strong ligand effects were observed, and the ligand effects on the monomers were found to play a more important role than the ligand effects on the nanocrystals. Experimental results suggest that, instead of monomer concentrations, monomer activities is a more relevant term for understanding the formation of nanocrystals because strong ligands always exist in the reaction solutions. The bonding strength and the steric effects of ligands dramatically affect the reactivity of monomers and are considered as contributors to the activity coefficients of monomers. The overall optical properties of the as-prepared CdTe nanocrystals are better than those reported in the literature and comparable to the standard CdSe nanocrystal system. The configuration of the hydrocarbon chains of the ligands on the surface of each nanocrystal also pla...