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Issue 16, 2011
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Fabrication of pyrenetetrasulfonate/layered double hydroxide ultrathin films and their application in fluorescence chemosensors

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Abstract

This paper reports the fabrication of fluorescence indicator/layered double hydroxide (LDH) ultrathin films (UTFs) by alternate assembly of 1,3,6,8-pyrenetetrasulfonat acid tetrasodium salt (PTS) and Zn–Al LDH nanosheets on quartz substrates using the layer-by-layer (LBL) deposition technique, and demonstrates their application as a fluorescence chemosensor for Cu2+. UV-vis absorption spectroscopy indicates a stepwise and regular growth of the PTS/LDH UTFs upon increasing deposition cycles. X-Ray diffraction, atomic force microscopy and scanning electron microscopy demonstrate that the UTFs possess a periodical layered structure perpendicular to the substrates with a thickness of 1.93–1.98 nm per bilayer. Furthermore, the fluorescence chemosensor with film thickness of 48 nm (24 bilayers) exhibits a broad linear response range for Cu2+ solution (0.6–50 μM), good repeatability (RSD less than 5% in 20 consecutive measurements), high photostability and storage stability (∼93.2% of its initial fluorescence intensity remains after one month) as well as excellent selectivity. In addition, the study on mechanism of measurement-regeneration cycle of the fluorescence chemosensor shows that Cu2+ enters/departs from the PTS/LDH UTF with reversible change in chemical composition, surface morphology and fluorescence anisotropy. Therefore, this work provides new opportunities for fabrication and application of chromophore/LDH UTFs which can be used as fluorescence chemosensors.

Graphical abstract: Fabrication of pyrenetetrasulfonate/layered double hydroxide ultrathin films and their application in fluorescence chemosensors

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Publication details

The article was received on 06 Jan 2011, accepted on 24 Feb 2011 and first published on 18 Mar 2011


Article type: Paper
DOI: 10.1039/C1JM00073J
Citation: J. Mater. Chem., 2011,21, 6088-6094
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    Fabrication of pyrenetetrasulfonate/layered double hydroxide ultrathin films and their application in fluorescence chemosensors

    W. Shi, Y. Lin, X. Kong, S. Zhang, Y. Jia, M. Wei, D. G. Evans and X. Duan, J. Mater. Chem., 2011, 21, 6088
    DOI: 10.1039/C1JM00073J

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