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Fe3O4 magnetic nanoparticles (MNPs) were synthesized by a co-precipitation method using the solution of ferrous/ferric mixed salt, and then an alkali solution is dropped into the mixed metal solution. With the seed mediated growth method, Ag nanorods were also obtained. SERS-active substrate composed of the Ag rod and Fe3O4 nanocomposites were fabricated with an applied magnetic field, which was ranging from 1450, 2500 and 3500 gauss. With the probed crystal violet (CV) molecule, SERS spectra were carried out. Our experimental results display that enhanced Raman signal can be obtained with the increased magnitude of magnetic field. It happens due to the enhanced electromagnetic field, which was caused by coupling effect of the local Plasmon resonance and the propagating Plasmon resonance. The magnetic nanoparticle forms uniform array under the influence of the external magnetic field. These uniformly arrayed distributions thereby enhance the local resonance of the above deposited Ag rod nanoparticles. Our proposed metallic-magnetic nanocomposites enable us a much free method to get the enhanced SERS effect, which can be used in the optical sensing, single molecule SERS, and bio-world applications.

Enhanced SERS Activity Induced by the Ag Rod-Fe3O4 Nanocomposite with Different Applied Magnetic Field