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Fabrication and magnetic-induced aggregation of Fe3O4 –noble metal composites for superior SERS performances

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Abstract

Fe3O4–noble metal composites were obtained by combining Au, Ag nanoparticles (NPs) with 3-aminopropyltrimethoxysilane-functionalized Fe3O4 NPs. UV–Visible absorption spectroscopy demonstrates the obtained Fe3O4 –noble metal composites inherit the typical surface plasmon resonance bands of Au, Ag at 533 and 453 nm, respectively. Magnetic measurements also indicated that the superparamagnetic Fe3O4 –noble metal composites have excellent magnetic response behavior. A magnetic-induced idea was introduced to change their aggregated states and take full advantage of their surface-enhanced Raman scattering (SERS) performances. Under the induction of an external magnetic field, the bifunctional Fe3O4 –noble metal aggregates exhibit the unique superiority in SERS detection of Rhodamine 6G (R6G), compared with the naturally dispersed Au, Ag NPs. Especially, the detection limit of the Fe3O4–Ag aggregates for R6G is as low as 10−14 M, and the calculated EF reaches up to 1.2 × 106, which meets the requirements for trace detection of analytes. Furthermore, the superiority could be extended to sensitive detection of other organic molecules, such as 4-mercaptopyridine. This work provides a new insight for active adjustment of the aggregated states of SERS substrates and the optimization of SERS performances.

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Acknowledgments

This work was supported by the National Natural Science Foundation of China (No. 61205150), the National Basic Research Program of China (2011CB302103), the State Key Laboratories of Transducer Technology (Skt0906).

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Authors and Affiliations

  1. Institute of Intelligent Machines, Chinese Academy of Sciences, Hefei, 230031, People’s Republic of China

    Zibao Gan, Aiwu Zhao, Maofeng Zhang, Dapeng Wang, Hongyan Guo, Wenyu Tao, Qian Gao, Ranran Mao & Erhu Liu

  2. Department of Chemistry, University of Science and Technology of China, Hefei, 230026, Anhui, People’s Republic of China

    Zibao Gan, Aiwu Zhao, Dapeng Wang, Wenyu Tao, Ranran Mao & Erhu Liu

  3. State Key Laboratory of Transducer Technology, Chinese Academy of Sciences, Hefei, 230031, People’s Republic of China

    Zibao Gan & Aiwu Zhao

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  1. Zibao Gan
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Correspondence to Aiwu Zhao.

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Gan, Z., Zhao, A., Zhang, M. et al. Fabrication and magnetic-induced aggregation of Fe3O4 –noble metal composites for superior SERS performances. J Nanopart Res 15, 1954 (2013). https://doi.org/10.1007/s11051-013-1954-1

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