Issue 43, 2014

Colorimetric strips for visual lead ion recognition utilizing polydiacetylene embedded nanofibers

Abstract

Given the dire consequences of accidental lead ion (Pb2+) exposure, a portable, sensitive and robust analytical approach capable of colorimetric visualization is highly desirable. In this study, we demonstrate a colorimetric strip that relies on a novel polydiacetylene (PDA) embedded polyacrylonitrile nanofibrous membrane (PAN NFM). The Pb2+-chromic PDA is prepared from controlled mixtures of 10,12-pentacosadiynoic acid (PCDA) and PCDA-5EG, a PCDA derivative with a pentaethylene glycol headgroup. Moreover, the Pb2+ complexation ability is manipulated by controlling the molar ratio of PCDA to PCDA-5EG. The PAN NFM acting as a three dimensional matrix is designed for PDA immobilization, thereby improving the stability, portability and sensitivity. Upon exposure to a series of metal ions, only Pb2+ could induce a color change, which clearly showed that our strip could act as a highly selective probe to detect Pb2+. Ultimately, the strip with a naked eye detection limit of 0.48 μM undergoes a brilliant color transition, from blue to red, in a concentration-dependent manner and all the color transitions of strips are quantitatively visualized by employing a chromatic framework. The findings indicate that the strip is particularly promising for visual Pb2+ recognition due to its facile functionalization, simple construction, and versatility to empower colorimetric signaling.

Graphical abstract: Colorimetric strips for visual lead ion recognition utilizing polydiacetylene embedded nanofibers

Supplementary files

Article information

Article type
Paper
Submitted
02 9 2014
Accepted
16 9 2014
First published
17 9 2014

J. Mater. Chem. A, 2014,2, 18304-18312

Author version available

Colorimetric strips for visual lead ion recognition utilizing polydiacetylene embedded nanofibers

Y. Li, L. Wang, X. Yin, B. Ding, G. Sun, T. Ke, J. Chen and J. Yu, J. Mater. Chem. A, 2014, 2, 18304 DOI: 10.1039/C4TA04547E

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