Ion-Mediated Ligand Exchange and Size Focusing of Semiconductor Nanocrystals in Ligand-Saturated Solutions
Ion-Mediated Ligand Exchange and Size Focusing of Semiconductor Nanocrystals in Ligand-Saturated Solutions
复制标题
配体饱和溶液中半导体纳米晶体的离子介导的配体交换和尺寸聚焦
DOI：
10.1021/acs.jpcc.8b09215
复制
发表时间：
2018
期刊：
影响因子：
--
通讯作者：
Anzenbacher, Pavel
中科院分区：
文献类型：
--
作者：
Kholmicheva, Natalia;Yang, Mingrui;Moroz, Pavel;Eckard, Holly;Vore, Abigail;Cassidy, James;Pushina, Mariia;Boddy, Anthony;Porotnikov, Dmitry;Anzenbacher, Pavel
控制胶体半导体纳米晶体（NCs）的形态仍然是一个具有挑战性的任务。传统的生长策略采用高浓度的单体来促进颗粒成核，这往往使溶液中活性物质过饱和。这导致了二次成核事件和其他弥散展宽过程。在这里，我们探索了缺乏单体的合成条件，作为调整半导体胶体形状和表面配体化学的双边策略。目前的方法不是控制成核阶段，而是采用基于低温消化成熟的合成后处理，其中小颗粒以牺牲大颗粒为代价生长。通过观察高浓度的l型（胺）或x型（油酸）离子增溶配体诱导的消化成熟反应中CdSe纳米颗粒的分散度降低了4倍，证明了本方法的可行性。在后一种情况下，通过表面离子扩散的并发过程实现了经典禁止的L→X配体交换。该技术的尺寸聚焦能力随后被成熟的ZnSe NCs证明，其形状均匀性通常难以实现。
Controlling the morphology of colloidal semiconductor nanocrystals (NCs) remains to be a challenging task. Traditional growth strategies employ a high concentration of monomers to promote particle nucleation, which tends to oversaturate the solution with reactive species. This leads to secondary nucleation events and other dispersion-broadening processes. Here, we explore monomer-deprived synthetic conditions as a bilateral strategy for tuning both the shape and the surface-ligand chemistry of semiconductor colloids. Rather than controlling the nucleation phase, the present method employs a postsynthetic treatment based on low-temperature digestive ripening, where small particles grow at the expense of larger ones. The feasibility of the present approach was demonstrated by observing a 4-fold reduction in the CdSe nanoparticle size dispersion during the digestive ripening reaction, which was induced by high concentrations of L-type (amines) or X-type (oleic acid) ion-solubilizing ligands. In the latter case, a classically forbidden L → X ligand exchange was enabled by the concurrent process of the surface ion diffusion. The size-focusing capacity of the technique were subsequently demonstrated by ripening ZnSe NCs, which shape homogeneity is generally difficult to achieve.
登录
查看更多内容
下一代光转换为光伏和太阳能燃料的现状和预测
影响因子：
22
作者：
M. Beard;J. Blackburn;Justin C. Johnson;G. Rumbles
通讯作者：
G. Rumbles
只需添加配体：胶体半导体纳米晶体的自我维持尺寸聚焦
影响因子：
8.6
作者：
Razgoniaeva, Natalia;Yang, Mingrui;Garrett, Paul;Kholmicheva, Natalia;Moroz, Pavel;Eckard, Holly;Royo Romero, Luis;Porotnikov, Dmitry;Khon, Dmitriy;Zamkov, Mikhail
通讯作者：
Zamkov, Mikhail
影响因子：
3.9
作者：
Nishimura, Shun;Takagaki, Atsushi;Ebitani, Kohki
通讯作者：
Ebitani, Kohki
DOI：
10.1002/cphc.200300859
发表时间：
2004-01
期刊：
Chemphyschem : a European journal of chemical physics and physical chemistry
影响因子：
--
作者：
Jia Wang;H. Boelens;M. Thathagar;G. Rothenberg
通讯作者：
Jia Wang;H. Boelens;M. Thathagar;G. Rothenberg
影响因子：
8.6
作者：
S. Cingarapu;Zhiqiang Yang;C. Sorensen;K. Klabunde
通讯作者：
S. Cingarapu;Zhiqiang Yang;C. Sorensen;K. Klabunde