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Ultrasensitive diffraction gratings based on smart hydrogels for highly selective and rapid detection of trace heavy metal ions

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Abstract

An ultrasensitive grating system based on stimuli-responsive hydrogels with ultra-low detection limit for highly-selective and rapid detection of trace heavy metal ions is developed. The excellent detection performance of trace heavy metal ions is demonstrated by using poly(N-isopropylacrylamide-co-benzo-18-crown-6-acrylamide) hydrogel gratings with well-designed molecular structures for detecting trace Pb2+ in water. The hydrogel grating with nanometer-sized height synergistically combines the fast thermo-responsive volume phase transition of poly(N-isopropylacrylamide) backbones and the highly-selective Pb2+ recognition of benzo-18-crown-6 moieties to achieve enhanced Pb2+-induced swelling changes for detecting trace Pb2+. By integrating the hydrogel grating into a simple optical detection system, the signal of trace Pb2+ can be efficiently converted and amplified into optical intensity signals for ultrasensitive, highly-selective and rapid detection of Pb2+ with concentration as low as 10−9 M. This hydrogel grating system provides an efficient strategy for ultrasensitive detection of trace heavy metal ions for protection of the environment and human health.

Graphical abstract: Ultrasensitive diffraction gratings based on smart hydrogels for highly selective and rapid detection of trace heavy metal ions

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Publication details

The article was received on 15 May 2018, accepted on 21 Sep 2018 and first published on 21 Sep 2018


Article type: Paper
DOI: 10.1039/C8TC02347F
Citation: J. Mater. Chem. C, 2018, Advance Article
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    Ultrasensitive diffraction gratings based on smart hydrogels for highly selective and rapid detection of trace heavy metal ions

    H. Peng, W. Wang, F. Gao, S. Lin, L. Liu, X. Pu, Z. Liu, X. Ju, R. Xie and L. Chu, J. Mater. Chem. C, 2018, Advance Article , DOI: 10.1039/C8TC02347F

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