Journal
ANALYTICA CHIMICA ACTA
Volume 777, Issue -, Pages 57-62Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.aca.2013.03.037
Keywords
Surface-imprinted; Core-shell; Nanoparticles; Surface-enhanced Raman scattering; Bisphenol A
Categories
Funding
- National Science Fund for Distinguished Young Scholars [21125522]
- Natural Science Foundation of China [21007015]
- Fundamental Research Funds for the Central Universities [WB1113005, WK1214021]
- State Key Laboratory of Chemical Engineering (ECUST) [SKL-ChE-11C01]
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Surface-imprinted core-shell Au nanoparticles (AuNPs) were explored for the highly selective detection of bisphenol A (BPA) by surface-enhanced Raman scattering (SERS). A triethoxysilane-template complex (BPA-Si) was synthesized and then utilized to fabricate a molecularly imprinted polymer (MIP) layer on the AuNPs via a sol-gel process. The imprinted BPA molecules were removed by a simple thermal treatment to generated the imprint-removed material, MIP-ir-AuNPs, with the desired recognition sites that could selectively rebind the BPA molecules. The morphological and polymeric characteristics of MIP-ir-AuNPs were investigated by transmission electron microscopy and Fourier-transform infrared spectroscopy. The results demonstrated that the MIP-ir-AuNPs were fabricated with a 2 nm MIP shell layer within which abundant amine groups were generated. The rebinding kinetics study showed that the MIP-ir-AuNPs could reach the equilibrium adsorption for BPA within 10 min owning to the advantage of ultrathin core-shell nanostructure. Moreover, a linear relationship between SERS intensity and the concentration of BPA on the MIP-ir-AuNPs was observed in the range of 0.5-22.8 mg L-1, with a detection limit of 0.12 mg L-1 (blank +/- 3 x s.d.). When applied to SEAS detection, the developed surface-imprinted core-shell MIP-ir-AuNPs could recognize BPA and prevent interference from the structural analogues such as hexafluorobisphenol A (BPAF) and diethylstilbestrol (DES). These results revealed that the proposed method displayed significant potential utility in rapid and selective detection of BPA in real samples. (C) 2013 Elsevier B.V. All rights reserved.
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