Colorimetric sensor strips for formaldehyde assay utilizing fluoral-p decorated polyacrylonitrile nanofibrous membranes.
Colorimetric sensor strips for formaldehyde assay utilizing fluoral-p decorated polyacrylonitrile nanofibrous membranes.
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DOI：
10.1039/c3an00812f
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发表时间：
2013-07
期刊：
影响因子：
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通讯作者：
Xueqin Wang;Y. Si;Xue Mao;Yan Li;Jianyong Yu;Huaping Wang;B. Ding
中科院分区：
文献类型：
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作者：
Xueqin Wang;Y. Si;Xue Mao;Yan Li;Jianyong Yu;Huaping Wang;B. Ding
利用4-氨基-3-戊烯-2-酮(F-P)功能化的电纺聚丙烯腈(PAN/F-P)纳米纤维膜，研制了一种简便、超灵敏、选择性强的甲醛肉眼比色传感器。传感器条在417 nm处有明显的反射率下降带，导致颜色由白色变为黄色，肉眼检测下限为40 ppb，远低于世界卫生组织的标准(80 Ppb)。基于F-P与甲醛的Hantzsch反应，制得的PAN/F-P膜对甲醛具有很高的选择性，几乎不受其他挥发性有机物的干扰，并对该反应的机理进行了详细的讨论。此外，使用UV-Vis光谱和由L*、a*、b*值计算的色差可以直观地定量比色响应。此外，由于初生PAN纳米纤维膜具有极大的比表面积和较高的孔隙率，因此纳米纤维膜片的感光度远高于传统的滤纸片。因此，这种有前景的便携式比色传感器条不仅可以用于气体甲醛的检测，还可以促进基于纳米纤维膜的新型比色传感系统的设计和开发。
A facile, ultrasensitive, and selective sensor strip utilizing 4-amino-3-penten-2-one (fluoral-p) functionalized electrospun polyacrylonitrile (PAN) (PAN/fluoral-p) nanofibrous membranes has been successfully developed for naked-eye colorimetric assay of formaldehyde. The sensor strips presented a significant reflectance decreasing band at 417 nm which induced a vivid color change from white to yellow and achieved a much lower naked-eye detection limit of 40 ppb compared with the World Health Organization standard (80 ppb). Based on the specific Hantzsch reaction between fluoral-p and formaldehyde, the as-prepared PAN/fluoral-p membranes are highly selective to formaldehyde with little interference from other volatile organic compounds and the proposed mechanism of this reaction is discussed carefully. Moreover, the colorimetric responses were visually quantitative using UV-vis spectra and the color difference calculated from L*, a*, b* values. Furthermore, due to the extremely large surface area and high porosity of the as-spun PAN nanofibrous membranes, the sensitivity of the nanofibrous membranes-based strips is much higher than traditional filter paper-based ones. Hence, such promising portable colorimetric sensor strips could not only potentially allow for assaying gaseous formaldehyde, but also facilitate the design and development of a novel colorimetric sensing system based on nanofibrous membranes.