Authors: Hongyan Guo Aiwu Zhao Rujing Wang Dapeng Wang Liusan Wang Qian Gao Henghui Sun Lei Li Qinye He
Publish Date: 2015/12/22
Volume: 17, Issue: 12, Pages: 494-
Abstract
This paper reports the generalized green synthesis of a series of Fe3O4/Ag composites by magnetron sputtering method The amounts of silver nanoparticles located on the hollow Fe3O4 magnetic nanoparticles can be tuned by controlling the sputtering time The surfaces of Fe3O4/Ag composites are rough with high density and numerous Ag nanogaps which can serve as Raman active hot spots to amplify the Raman signal providing the sound reliability and reproducibility of Raman detection With paminothiophenol and Rhodamine 6G R6G for probe molecules the surfaceenhanced Raman scattering SERS properties of these Fe3O4/Ag composites were studied It was found that the SERS signal reached the maximum with the sputtering time of 130 s indicating that this compound had most hot spots In this paper we used the composite with the strongest SERS signal for thiram detection and the detection limit can reach 5 × 10−7 mol/L about 0012 ppm which is lower than the maximal residue limit of 7 ppm in fruit prescribed by the US Environmental Protection Agency The Fe3O4/Ag composites are readily available easy to carry and show great potential for applications in universal SERS substrates in practical SERS detectionThis work was supported by the National Natural Science Foundation of China No 61378038 the Major/Innovative Program of Development Foundation of Hefei center for Physical Science and Technology 2014FXZY003 and the State Key Laboratories of Transducer Technology for financial support
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