Surface-enhanced Raman scattering from magneto-metal nanoparticle assemblies |
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Authors: | Hua Qu Yuming Lai Dongzi Niu Shuqing Sun |
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Institution: | 1. National Center for Nanoscience and Technology, Beijing 100190, People''s Republic of China;2. Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, People''s Republic of China;3. Institute of Material Science and Engineering, Ocean University of China, Qingdao 266100, People''s Republic of China |
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Abstract: | Binary nanoparticles composed of a superparamagnetic Fe3O4 core and an Au nanoshell (Fe3O4@Au) were prepared via a simple co-precipitation method followed by seed-mediated growth process. The nanoparticles exhibited functions of both fast magnetic response and local surface plasmon resonance. The Fe3O4@Au nanoparticles were used as probes for surface-enhanced Raman scattering (SERS) using p-thiocresol (p-TC) as reporter molecule. With the ability of analyte capture and concentration magnetically, the Fe3O4@Au nanoparticles showed significant SERS properties with excellent reproducibility. Under non-optimized conditions, detection limit as low as 4.55 pM of analyte can be reached using Fe3O4@Au nanoparticle assemblies, which excel remarkably the cases with traditional Au nanoprobes. |
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Keywords: | Magneto-metal nanoparticle Core&ndash shell nanostructure Surface-enhanced Raman scattering |
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