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
中科院分区:
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
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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