Vu Duy Linh, Lin Tz-Feng, Lin Ting-Han, Wu Ming-Chung
Department of Chemical and Materials Engineering, Chang Gung University, Taoyuan 33302, Taiwan.
Department of Fiber and Composite Materials, Feng Chia University, Taichung 40724, Taiwan.
Polymers (Basel). 2020 Feb 16;12(2):455. doi: 10.3390/polym12020455.
Detection of volatile organic compounds (VOCs) is one of the essential concerns for human health protection and environmental monitoring. In this study, the blending fibers using a donor-acceptor copolymer were fabricated by electrospinning technique and subsequent UV/ozone treatment. The donor-acceptor polymers were polyaniline, P3TI, and poly(methyl methacrylate) (PANI/P3TI/PMMA) fibers with a cylindrical structure and uniform morphology. VOCs were directly adsorbed by the copolymer materials assembled onto a glass surface or metal framework scaffold. Under optimal conditions, the PANI/P3TI/PMMA fibers exhibit rapid response and high selectivity to VOC vapors within 30 min of UV/ozone treatment. Additionally, the optical transmittance changes of the freestanding fibers show significant improvement of more than 10 times to those fibers on glass substrates. It is speculated that the presence of P3TI leads to the formation of a heterojunction and increases the electron reception behavior. The modification of the electronic structure as exposed to VOC vapors tend to significantly alter the optical absorbance of the fibers, leading to the excellent sensing at low VOC concentration.
挥发性有机化合物（VOCs）的检测是人类健康保护和环境监测的重要关注点之一。在本研究中，使用供体-受体共聚物的混合纤维通过静电纺丝技术及随后的紫外线/臭氧处理制备而成。供体-受体聚合物为具有圆柱形结构和均匀形态的聚苯胺、P3TI和聚甲基丙烯酸甲酯（PANI/P3TI/PMMA）纤维。VOCs被组装在玻璃表面或金属框架支架上的共聚物材料直接吸附。在最佳条件下，PANI/P3TI/PMMA纤维在紫外线/臭氧处理30分钟内对VOC蒸汽表现出快速响应和高选择性。此外，独立纤维的透光率变化相比于玻璃基板上的纤维有显著改善，提高了10倍以上。据推测，P3TI的存在导致形成异质结并增加了电子接收行为。暴露于VOC蒸汽时电子结构的改变往往会显著改变纤维的光吸收率，从而在低VOC浓度下实现优异的传感性能。
