Emergence of Structural Phosphorescence in Free-Standing, Laterally Organized Polymer Nanofiber Membranes
Emergence of Structural Phosphorescence in Free-Standing, Laterally Organized Polymer Nanofiber Membranes
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DOI：
10.1021/acsapm.2c01477
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发表时间：
2023-03-10
影响因子：
5
通讯作者：
Lahann，Joerg
中科院分区：
文献类型：
--
作者：
Wawryszyn，Mirella;Wilhelm，Robin;Lahann，Joerg
在过去的十年中，无金属限制聚合物结构的磷光由于其可持续性、低毒性和在传感应用中的部署而引起了光电子学的兴趣。本文中，通过模板化化学气相沉积聚合将横向组织的纳米纤维的独立阵列制备成液晶（LC）相，并且将它们的光学性质与组成相同的膜进行比较。纤维会聚成横向排列的膜，尽管膜的表面保持均匀和封闭，但该膜保持高的内部秩序。该膜由沙漏形纳米纤维组成，具有微米和纳米范围的特征。自支撑的纳米纤维膜在几个关键特征上不同于具有等同化学组成的聚合物膜：（1）聚合物纳米纤维的各向异性生长，其具有对LC模板的约束和顺应性，（2）高的表面与体积比，以及（3）在蓝色区域中发生长寿命发射，其在激发后持续数秒。这项研究首次报道了固态聚对二甲苯纳米纤维的长寿命发射。具有结构发光的形貌控制聚合物阵列在有机传感器和光电子器件等方面具有广阔的应用前景。
In the past decade, the phosphorescence of metal-free confined polymer structures has generated interest in optoelectronics due to their sustainability, low toxicity, and deployment in sensing applications. Herein, a free-standing array of laterally organized nanofibers was prepared via templated chemical vapor deposition polymerization into a liquid crystalline (LC) phase, and their optical properties were compared to compositionally identical films. The fibers converge into laterally aligned membranes that maintain a high internal order despite the surfaces of the membranes remaining uniform and closed. The membranes consisted of hourglass-shaped nanofibers with features in the micro- and nanometer regime. Free-standing nanofiber membranes differ from polymer films of equivalent chemical composition in several key features: (1) Anisotropic growth of polymer nanofibers with constraint and compliance to an LC template, (2) a high surface-to-volume ratio, and (3) the occurrence of a long-lived emission in the blue region, which persists for multiple seconds after excitation. This study constitutes the first report of long-lived emission from solid-state poly(p-xylylenes) nanofibers. Prospective applications of morphologically controlled polymer arrays with structural luminescence include organic sensors and optoelectronic devices.