Nanofibrous polyethyleneimine membranes as sensitive coatings for quartz crystal microbalance-based formaldehyde sensors
Nanofibrous polyethyleneimine membranes as sensitive coatings for quartz crystal microbalance-based formaldehyde sensors
复制标题
纳米纤维聚乙烯亚胺膜作为石英晶体微天平甲醛传感器的敏感涂层
DOI：
10.1016/j.snb.2009.08.023
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发表时间：
2010-01-29
影响因子：
8.4
通讯作者：
Sun, Gang
中科院分区：
文献类型：
--
作者：
Wang, Xianfeng;Ding, Bin;Sun, Gang
采用静电纺丝技术将聚乙烯亚胺（PEI）/聚乙烯醇（PVA）纳米纤维膜作为敏感膜，组装在石英晶体微天平（QCM）上，制备了一种新型甲醛传感器。通过调节PEI/PVA溶液中聚合物和溶剂的组成，可以控制包含直径为40 nm至1.8 μ m的纤维的多孔三维PEI/PVA膜的形态。所得到的传感器显示出快速响应甲醛和线性关系时，增加甲醛浓度线索甲醛分子和PEI的胺基之间的可逆相互作用。在室温下，传感器响应对浓度范围为10-255 ppm的甲醛是可逆的和可再现的。当暴露于255 ppm的甲醛时，由水和乙醇的共溶剂形成的纤维膜涂覆的QCM传感器的灵敏度比相应的平膜涂覆的QCM传感器的灵敏度高3倍。实验结果表明，室内相对湿度是影响传感器灵敏度的关键参数。此外，纤维PEI/PVA膜涂覆的QCM传感器表现出良好的选择性，甲醛与竞争蒸汽测试时。(C)2009 Elsevier B. V.保留所有权利。
A novel formaldehyde sensor was fabricated by electrospinning deposition of nanofibrous polyethyleneimine (PEI)/poly(vinyl alcohol) (PVA) membranes as sensitive coatings on quartz crystal microbalance (QCM). The morphology of the porous three-dimensional PEI/PVA membranes comprising fibers with diameter of 40 nm to 1.8 mu m was controllable by tuning the compositions of polymers and solvents in PEI/PVA Solutions. The resultant sensors showed a fast response to formaldehyde and a linear relationship upon increasing the formaldehyde concentrations clue to the reversible interaction between formaldehyde molecules and amine groups of PEI. The sensor responses were reversible and reproducible towards formaldehyde in the concentration range of 10-255 ppm at room temperature. The sensitivity Of fibrous membrane coated QCM sensors formed from the cosolvent of water and ethanol was three times higher than hat of corresponded flat membrane coated QCM sensors when exposed to 255 ppm of formaldehyde. Relative humidity in testing chamber was proved to be the key parameter to affect the sensor sensitivity. Additionally, the fibrous PEI/PVA membrane coated QCM sensors exhibited a good selectivity to formaldehyde when tested with competing vapors. (C) 2009 Elsevier B.V. All rights reserved.