Journal
TALANTA
Volume 131, Issue -, Pages 354-360Publisher
ELSEVIER
DOI: 10.1016/j.talanta.2014.07.028
Keywords
Molecularly imprinted polymers; Magnetic graphene oxide; Gold nanoparticles; Electrochemical sensor; Dibutyl phthalate
Categories
Funding
- National Natural Science Foundation of China (NSFC) [21345005, 21205048]
- Shandong Provincial Natural Science Foundation of China [ZR2012BM020]
- Scientific and technological development Plan Item of Jinan City in China [201202088]
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A novel composite of magnetic graphene oxide @ gold nanoparticles-molecular imprinted polymers (MGO@AuNPs-MIPs) was synthesized and applied as a molecular recognition element to construct dibutyl phthalate (DBP) electrochemical sensor. The composite of MGO@AuNPs was first synthesized using coprecipitation and self-assembly technique. Then the template molecules (DBP) were absorbed at the MGO@AuNPs surface due to their excellent affinity, and subsequently, selective copolymerization of methacrylic acid and ethylene glycol dimethacrylate was further achieved at the MGO@AuNPs surface. Potential scanning was presented to extract DBP molecules from the imprinted polymers film rapidly and completely. As a consequence, an electrochemical sensor for highly sensitive and selective detection of DBP was successfully constructed as demonstration based on the synthesized MGO@AuNPs-MIPs composite. Under optimal experimental conditions, selective detection of DBP in a linear concentration range of 2.5 x 10(-9)-5.0 x 10(-6) mol/L was obtained. The new DBP electrochemical sensor also exhibited excellent repeatability, which expressed as relative standard deviation (RSD) was about 2.50% for 30 repeated analyses of 2.0 x 10(-6) mol/L DEP. (C) 2014 Elsevier B.V. All rights reserved.
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