title: Surface-enhanced Raman scattering from magneto-metal nanoparticle assemblies.
abstract: 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.
authors: National Center for Nanoscience and Technology, Beijing 100190, People's Republic of China.
authors: Hua
authors: H
authors: Qu
authors: Yuming
authors: Y
authors: Lai
authors: Dongzi
authors: D
authors: Niu
authors: Shuqing
authors: S
authors: Sun