Issue 18, 2015

Constitution of a visual detection system for lead(ii) on polydiacetylene–glycine embedded nanofibrous membranes

Abstract

With the aim to develop pH-paper-like lead ion (Pb2+) sensing materials, we demonstrate a colorimetric strip, which relies on a SiO2 nanoparticle (NP) decorated polydiacetylene embedded polyacrylonitrile nanofibrous membrane (PAN NFM), that undergoes a brilliant blue-to-red color transition as well as ‘Turn-On’ fluorescence upon incubation with Pb2+. The introduction of an amino acid (glycine) headgroup into a supramolecularly assembled 10,12-pentacosadiynoic acid results in a Pb2+-induced chromic conjugated polymer that is quickly photopolymerizable, rapidly responsive to Pb2+ and specifically identifiable. Moreover, the SiO2 NPs are certified as an efficient sensitivity promoter when their content reaches 0.5 wt% in the strip. With this understanding, the color change that is caused by 0.24 μM Pb2+ at ambient temperature can be easily perceived by the naked eye, which indicates the superiority of our strip compared with previous approaches, and it is also noteworthy that a fluorescent signal could also be produced in 2 min. Furthermore, RGB (red-green-blue) digital parameters obtained from images of the strips and automatic read outs via a smartphone were processed statistically through principal component analysis and then used to elaborate the standard curve and quantify Pb2+ concentration. This methodology for assaying and quantifying Pb2+ avoids time-consuming sample preparation, expensive laboratory techniques, and specialized personnel required to carry out conventional analytical methods.

Graphical abstract: Constitution of a visual detection system for lead(ii) on polydiacetylene–glycine embedded nanofibrous membranes

Supplementary files

Article information

Article type
Paper
Submitted
24 Jan 2015
Accepted
18 Mar 2015
First published
18 Mar 2015

J. Mater. Chem. A, 2015,3, 9722-9730

Constitution of a visual detection system for lead(II) on polydiacetylene–glycine embedded nanofibrous membranes

Y. Li, L. Wang, Y. Wen, B. Ding, G. Sun, T. Ke, J. Chen and J. Yu, J. Mater. Chem. A, 2015, 3, 9722 DOI: 10.1039/C5TA00608B

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