A Low-Symmetry Cubic Mesophase of Dendronized CdS Nanoparticles and Their Structure-Dependent Photoluminescence

A Low-Symmetry Cubic Mesophase of Dendronized CdS Nanoparticles and Their Structure-Dependent Photoluminescence
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树枝状 CdS 纳米粒子的低对称立方中间相及其结构依赖性光致发光

DOI:
10.1016/j.chempr.2017.05.001
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发表时间:
2017-06
期刊:
影响因子:
23.5
通讯作者:
Kiyoshi Kanie
Kiyoshi Kanie
中科院分区:
化学1区
文献类型:
--
作者:
Masaki Matsubara;Warren Stevenson;Jun Yabuki;Xiangbing Zeng;Haoliang Dong;Kazunobu Kojima;Shigefusa F. Chichibu;Kaoru Tamada;Atsushi Muramatsu;Goran Ungar;Kiyoshi Kanie

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在用脂肪族硫醇(内部)和液晶芳香树突(外部)的两层冠修饰的 CdS 量子点(QD)系统中获得了具有 P213 对称性的液晶(LC)相,这是迄今为止立方液晶中最低的。我们认为,这种立方中间相异常低的对称性是多层日冕的结果,由于长和短“鬃毛”的组合,多层日冕更喜欢采用各向异性的径向轮廓。 P213相中树突(长鬃毛)的各向异性分布被认为促进芳香族部分之间的π-π相互作用。这种相互作用产生非辐射激子能量转移途径,引起 CdS QD 的光致发光猝灭。这被认为是结构相关的排放猝灭行为的第一个例子。
A liquid crystal (LC) phase withP213 symmetry, the lowest so far in a cubic LC, was obtained in a system of CdS quantum dots (QDs) modified with a two-layer corona of aliphatic thiols (inner) and LC aromatic dendrons (outer). We propose that the unusual low symmetry of this cubic mesophase is a result of the multi-layered corona, which prefers to adopt an anisotropic radial profile because of the combination of long and short "bristles." The anisotropic distribution of dendrons (long bristles) in theP213 phase is thought to facilitate π-π interaction among the aromatic moieties. The interaction gives rise to non-radiative exciton energy-transfer pathways that induce photoluminescence quenching of the CdS QDs. This is believed to be the first example of structure-dependent emission-quenching behavior.
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