Issue 17, 2013
From the journal:

Analyst

Colorimetric sensor strips for formaldehyde assay utilizing fluoral-p decorated polyacrylonitrile nanofibrous membranes†

Xueqin Wang,ab   Yang Si,a   Xue Mao,a   Yan Li,c   Jianyong Yu,c   Huaping Wanga  and  Bin Ding*abc  

* Corresponding authors

a State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201620, China
E-mail: binding@dhu.edu.cn
Fax: +86 21 62378202
Tel: +86 21 62378202

b State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry, Donghua University, Shanghai 201620, China

c Nanomaterials Research Center, Modern Textile Institute, Donghua University, Shanghai 200051, China

Abstract

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.

Graphical abstract: Colorimetric sensor strips for formaldehyde assay utilizing fluoral-p decorated polyacrylonitrile nanofibrous membranes

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Article information

DOI
https://doi.org/10.1039/C3AN00812F
Article type
Paper
Submitted
23 Apr 2013
Accepted
22 May 2013
First published
23 May 2013

Analyst, 2013,138, 5129-5136

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Colorimetric sensor strips for formaldehyde assay utilizing fluoral-p decorated polyacrylonitrile nanofibrous membranes

X. Wang, Y. Si, X. Mao, Y. Li, J. Yu, H. Wang and B. Ding, Analyst, 2013, 138, 5129 DOI: 10.1039/C3AN00812F

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