Porous organic polymers (POP) are potential materials for fluorescent sensors because of their extended π-conjugated framework and porous structure. However, poor processability and photofunctionality are the major limitations for their practical applications. Here, a highly emissive photofunctional POP film (polyPhTPECz) was constructed using a simple in situ electropolymerization (EP) method. A novel high-luminescence aggregation-induced emission (AIE) molecule (PhTPECz), composed of multiple AIE groups as the central “core” and eight carbazole electroactive “arms,” was used as an electroactive precursor. Two possible twist conformations of polyPhTPECz were speculated and the corresponding pore diameters calculated to be ∼1.2 and 2.9 nm, respectively. These polyPhTPECz EP films were excellent multifunctional and reusable luminescent sensors for 2,4,6-trinitrophenol (TNP) and Fe³⁺ in an aqueous medium. The obtained limit of detection (LOD) was 3.8 and 10.0 nM for sensing TNP and Fe³⁺, respectively. These films also showed sensitive detection for TNP vapor. The fluorescence-quenching mechanism for TNP was a combination of electron transfer and resonance energy transfer. These excellent properties were mainly attributed to the high fluorescence property and cross-linked porous texture of these polyPhTPECz films.

中文翻译：

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基于AIE发光剂的电聚合膜：水中TNP和Fe3 +的超灵敏荧光探针

多孔有机聚合物（POP）由于其扩展的π共轭骨架和多孔结构而成为荧光传感器的潜在材料。然而，差的可加工性和光功能性是其实际应用的主要限制。在这里，使用简单的原位构建高发射光致功能的POP膜（polyPhTPECz）电聚合（EP）方法。一种新颖的高发光聚集诱导发射（AIE）分子（PhTPECz），由多个AIE组作为中心“核心”和八个咔唑电活性“臂”组成，被用作电活性前体。推测了polyPhTPECz的两种可能的扭曲构象，相应的孔径分别为〜1.2和2.9 nm。这些polyPhTPECz EP膜是用于水性介质中的2,4,6-三硝基苯酚（TNP）和Fe ^3+的出色的多功能且可重复使用的发光传感器。获得的检测TNP和Fe ³⁺的检测限（LOD）为3.8和10.0 nM， 分别。这些薄膜还显示出对TNP蒸气的灵敏检测。TNP的荧光猝灭机制是电子转移和共振能量转移的结合。这些优异的性能主要归因于这些polyPhTPECz膜的高荧光性能和交联的多孔质地。