Preparation of a self-cleanable molecularly imprinted sensor based on surface-enhanced Raman spectroscopy for selective detection of R6G
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Novel molecularly imprinted polymers (MIPs) based on the technique of surface-enhanced Raman scattering (SERS) were successfully prepared. Firstly, ZnO nanorods were fabricated with Ag by reduction of Ag+ on the surface of the ZnO nanorods. Then, ZnO/Ag heterostructures were used as the substrate, rhodamine 6G was used as the template molecule, acrylamide was used as the functional monomer, ethylene glycol dimethacrylate was used as the cross-linker, and 2,2′-azobis(2-methylpropionitrile) was used as the initiator to prepare the ZnO/Ag MIPs (ZOA-MIPs). Through characterization analysis, it was proved that the novel ZOA-MIPs exhibited excellent SERS properties and selectivity. Under the optimal conditions, there was a good linear relationship (R 2 = 0.996) between the Raman signal (at 1654 cm-1) and the concentration of the templates, and the detection limit was 10-13 mol L-1. It was also proved that the ZOA-MIPs had the property of self-cleaning, resulting in good reusability. It is envisaged that the sensitivity of SERS coupled with the selectivity of MIPs could result in a promising chemosensor for practical applications.
KeywordsMolecularly imprinted polymers Surface-enhanced Raman scattering ZnO/Ag heterostructures Self-cleaning Selective detection
This work was financially supported by the National Natural Science Foundation of China (nos 21277063, 21407057, 21407064, 21507045, and 21576111), the National Basic Research Program of China (973 Program, 2012CB821500), the Natural Science Foundation of Jiangsu Province (nos BK20140534 and BK20140535), the National Postdoctoral Science Foundation (no. 2014 M561595), and the Postdoctoral Science Foundation funded project of Jiangsu Province (no. 1401108C).
Compliance with ethical standards
Conflict of interest
The authors declare that they have no potential conflict of interest.
- 17.Ko H, Chang S, Tsukruk VV. Porous substrates for label free molecular level detection of nonresonant organic molecules. ACS Nano 2009;3:181–188.Google Scholar
- 20.Chen T, Xing GZ, Zhang Z, Chen HY, Wu T. Tailoring the photoluminescence of ZnO nanowires using Au nanoparticles. Nanotechnology. 2008;19:17030–1.Google Scholar
- 34.Canamares MV, GarciaRamos JV, GomezVarga JD, Domingo C, SanchezCortes S. Comparative study of the morphology, aggregation, adherence to glass, and surface-enhanced Raman scattering activity of silver nanoparticles prepared by chemical reduction of Ag+ using citrate and hydroxylamine. Langmuir. 2005;21:8546–53.CrossRefGoogle Scholar
- 37.Barakat N, Woo AM, Kanjwal KD, Choi MA, Khil KE, Kim MS. Surface plasmon resonances, optical properties, and electrical conductivity thermal hystersis of silver nanofibers produced by the electrospinning technique. Langmuir J Am Chem Soc. 2008;24:11982–7.Google Scholar