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Anal Chim Acta. 2013 Feb 6;763:38-42. doi: 10.1016/j.aca.2012.12.016. Epub 2012 Dec 19.

Surface-enhanced Raman scattering from magneto-metal nanoparticle assemblies.

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National Center for Nanoscience and Technology, Beijing 100190, People's Republic of China.


Binary nanoparticles composed of a superparamagnetic Fe(3)O(4) core and an Au nanoshell (Fe(3)O(4)@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 Fe(3)O(4)@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 Fe(3)O(4)@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 Fe(3)O(4)@Au nanoparticle assemblies, which excel remarkably the cases with traditional Au nanoprobes.


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