Silver microspheres coated with a molecularly imprinted polymer as a SERS substrate for sensitive detection of bisphenol A
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An efficient approach is demonstrated for preparing particles consisting of a silver core and a shell of molecularly imprinted polymer (Ag@MIP). The MIP is prepared by using bisphenol A (BPA) as the template and 4-vinylpyridine as the functional monomer. The Ag@MIP fulfills a dual function in that the silver core acts as a SERS substrate, while the MIP allows for selective recognition of BPA. The Ag@MIP is characterized by scanning electron microscopy, transmission electron microscopy, X-ray powder diffraction, thermogravimetric analysis and Raman spectroscopy. The Raman intensity of Ag@MIP is higher than that of bare silver microspheres. The detection limit for BPA is as low as 10−9 mol·L−1.
KeywordsCore-shell system Chemical enhancement Electromagnetic enhancement Endocrine-disrupting chemicals Molecular imprinting
We are grateful for the financial support of this research from the National Natural Science Foundation of China (51579057, 51379052), and State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology (2016DX07).
Compliance with ethical standards
The author(s) declare that they have no competing interests.
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