Journal
DYES AND PIGMENTS
Volume 101, Issue -, Pages 122-129Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.dyepig.2013.09.040
Keywords
Graphene oxide hybrid materials; PPV; Mesoporous silica nanoparticles; TNT detection; FRET; Fluorescence sensor
Funding
- National Natural Science Foundation of China [21074019]
- Natural Science Foundation of Jilin Province [20101539]
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This paper reported a convenient method to prepare water-soluble graphene oxide (GO) functionalized by amine-modified mesoporous silica nanoparticles (MSNs) containing poly(p-phenylenevinylene) via covalent bonds. The resulted GO-PPV@MSN hybrid materials had a good dispersion and strong green fluorescence in aqueous solution. The structure, morphology and optical properties of the resulting hybrid materials were characterized. The GO-PPV@MSN can be used as a novel and effective fluorescent sensing platform for detection of 2,4,6-trinitrotoluene (TNT) in aqueous solution by fluorescence resonance energy transfer (FRET). Upon the addition of TNT, the amino groups on the surface of PPV@MSN can bind TNT molecules from solution by forming Meisenheimer complex, and this complex can absorb the green part of visible light, and strongly suppress the fluorescence emission of GO-PPV@MSN through FRET. The observed linear fluorescence intensity change allowed the quantitative detection of TNT with a detection limit down to 1.3 x 10(-7) M. (C) 2013 Elsevier Ltd. All rights reserved.
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