Journal
BIOSENSORS & BIOELECTRONICS
Volume 52, Issue -, Pages 317-323Publisher
ELSEVIER ADVANCED TECHNOLOGY
DOI: 10.1016/j.bios.2013.09.022
Keywords
Graphene quantum dots; Molecularly imprinted polymer; Fluorescent sensor; 4-NP
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Funding
- National Natural Science Foundation of China [21175044, 21275055, 21277048]
- Science & Technology Commission of Shanghai Municipality [10JC1404000]
- Natural Science Foundation of Shanghai [11ZR1410700]
- Research Fund for the Doctoral Program of Higher Education [20100076110002]
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A novel fluorescent sensor based on graphene quantum dots (GQDs) was synthesized for determination of paranitrophenol (4-NP) in water sample, where molecularly imprinted polymer (MIP) was incorporated in GQDs-based sensing system for the first time. A simple hydrothermal method was used to fabricate silica-coated GQDs. The final composite was developed by anchoring the MIP layer on the silica-coated GQDs using 3-aminopropyltriethoxysilane as functional monomer and tetraethoxysilane as crosslinker. The combination of GQDs and MIP endows the composite with stable fluorescent property and template selectivity. Due to resonance energy transfer from GQDs (donor) to 4-NP (acceptor), the fluorescence of the MIP-coated GQDs composite can be efficiently quenched when 4-NP molecules rebound to the binding sites. The composite was applied to the detection of the non-emissive 4-NP and exhibited a good linearity in range of 0.02-3.00 mu g mL(-1) with the detection limit of 9.00 ng mL(-1) (S/N=3). This work may open a new possibility for developing GQDs-based composite with selective recognition, and it is desirable for chemical sensing application. (C) 2013 Elsevier B.V. All rights reserved.
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