摘要
目的:制备一种卟啉化聚酰亚胺电纺纤维膜用于微量甲醇蒸气的快速检测。方法:通过化学共聚将卟啉引入聚酰亚胺大分子主链;采用静电纺丝技术制备卟啉化聚酰亚胺电纺纤维膜,通过改变溶液组成、纺丝电压等,调控纳米纤维微结构,从而获得具有微/纳立体结构和大比表面积的电纺纤维膜,应用于微量甲醇蒸气的快速检测。结果:制备的卟啉化聚酰亚胺电纺纤维膜直径分布均匀、形貌良好,且保持了卟啉的基本光谱特性。当甲醇蒸气与此电纺纤维膜作用时,可引起其紫外光谱的红移与荧光强度的减弱,而其它一些常见醇类并无此现象。交替通入150 ppm的甲醇蒸气与氮气后,电纺纤维膜的荧光强度几乎没有改变,显示出良好的可重复使用性。结论:基于卟啉优异的光敏性能和纳米纤维高比表面积的特点,设计并制备了卟啉化聚酰亚胺电纺纤维膜,用于微量甲醇蒸气的检测。该电纺纤维膜具有灵敏度高,选择性好,并可重复使用等优点。
Objective:To prepare novel electrospun porphyrinated polyimide nanofibrous membrane for rapid detection of trace amount of methanol vapor.Methods:Porphyrin chromophore was copolyimized into polyimide backbones and the porphyrinated polyimide nanofibrous membrane was prepared by electrospinning technique.By optimizing the processing parameters,such as solution concentration and electrospinning voltage,nanofibrous membrane with three dimensional and large surface-to-area ratio structure was fabricated for trace amount of methanol vapor sensing applications.Results:The obtained nanofibrous membrane preserved typical photophysical properties of porphyrin chromophores with uniformly fine and smooth fiber diameter.When exposed to methanol vapor,a red-shift of the absorption spectra and decrease in the emission intensities was observed,while no significant changes were seen when the membrane contacting with other common alcohols.After five times of 150 ppm methanol vapor quenching and nitrogen gas regeneration,the fluorescence of the membrane remained unchanged,indicating a good reversibility.Conclusions:Combining the specific optical properties of porphyrin with large surface-area-to-volume ratio of nanofibrous membranes,a porphyrinated polyimide nanofibrous membrane has been facilely fabricated for trace methanol vapor detection.The sensing membrane exhibits good sensitivity,selectivity and reproducibility.
出处
《浙江大学学报（医学版）》
CAS
CSCD
北大核心
2011年第4期414-420,共7页
Journal of Zhejiang University(Medical Sciences)
基金
国家自然科学基金(50973094)
浙江大学城市学院教师基金(210000-581647)
