A Dendrimer-Based Electropolymerized Microporous Film: Multifunctional, Reversible, and Highly Sensitive Fluorescent Probe
A Dendrimer-Based Electropolymerized Microporous Film: Multifunctional, Reversible, and Highly Sensitive Fluorescent Probe
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基于树枝状聚合物的电聚合微孔薄膜：多功能、可逆、高灵敏度荧光探针
DOI：
10.1002/adfm.201504692
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发表时间：
2016-03-22
影响因子：
19
通讯作者：
Muellen, Klaus
中科院分区：
文献类型：
--
作者：
Ma, Hongwei;Li, Feng;Muellen, Klaus
采用电聚合法制备荧光膜的电活性前驱体PYTPAG2，该结构由中心芘“核”和四个外部三苯胺“臂”组成。荧光发射来自中心的芘“核”，外部“臂”的位阻有利于微孔形态的形成。即使作为独立薄膜，也可以获得稳定且高度交联的EP荧光膜。进一步研究了这些树状聚合物EP膜作为多功能荧光探针：EP膜暴露于三硝基甲苯蒸气中，在120s内发射猝灭82%；EP膜对溶液中的Fe3+也起到荧光传感器的作用，检测限为8.5 × 10(-8) m。上述检测过程具有显著的可逆性。这些优异的性能归功于PYTPAG2的特定分子特征和EP薄膜的固有特性。
A dendrimer PYTPAG2 composed of a central pyrene "core" and four exterior "arms" capped with electroactive triphenylamine is developed as an electroactive precursor to prepare fluorescent films through electropolymerization (EP). The fluorescence emission comes from the central pyrene "core" and the steric hindrance of the exterior "arms" is beneficial for the formation of microporous morphology. The stable and highly cross-linked fluorescent EP films can be obtained even as free-standing films. Further, these dendrimer EP films are first studied as the multifunctional fluorescent probe: the emission of EP films exposed to trinitrotoluene vapor is quenched by 82% in 120 s; while the fluorescence is increased to nearly 400% in 120 s upon exposure to benzene vapor, EP films also act as the fluorescent sensor to Fe3+ in solution and the limit of detection is obtained to be 8.5 x 10(-8) M. All the above detection processes exhibit remarkable reversibility. These excellent performances are attributed to both the specific molecular features of PYTPAG2 and the intrinsic properties of EP films.