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Chemical Sensors 2014, 4: 8
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Research Article
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Polyacrylonitrile nanofibrous membranes functionalized by polyethyleneimine on quartz crystal microbalance for formaldehyde detection
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Wei Huanga, Xueqin Wangb, Yang Sib, Yan Lia, Xueli Wangb, Jianyong Yub, Bin Dinga,b, Gang Zhengc, Wenjing Luoc
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a College of Textiles, Donghua University, Shanghai 201620, China
b Nanomaterials Research Center, Modern Textile Institute, Donghua University, Shanghai 200051, China
c Department of Occupational and Environmental Health, School of PublicHealth, Fourth Military Medical University, 169 Changle West Road,Xi’an, Shaanxi 710032, China
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Abstract |
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A facile, sensitive, selective, and reproductive formaldehyde sensor has been developed based on polymer modified quartz crystal microbalance (QCM). A nanostructured complex, polyethyleneimine (PEI) functionalized electrospun polyacrylonitrile (PAN) nanofibrous membranes (PEI-PAN) is utilized as a novel sensing coatings on QCM. Taking advantage of the large surface area, high porosity, and large stacking density of electrospun nanofibrous membranes, the sensors achieved a low detection limit of 1 ppm and a fast response. Moreover, the sensitivity of PEI-PAN fibrous membranes coated QCM sensors are two times higher than PEI flat film ones as formaldehyde concentration is 1 ppm. Furthermore, based on the reversible nucleophilic reaction between formaldehyde and primary amine groups of PEI, the sensors exhibit good selectivity and reproducibility. Hence, such a promising QCM sensor could potentially not only be used to detect formaldehyde, but also facilitate the design and development of novel sensing systems based on nanofibrous membranes.
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Keywords |
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Quartz crystal microbalance (QCM); Electrospun nanofibrous membranes; Polyethyleneimine (PEI); Formaldehyde sensor
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