Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/6083
Title: Maximizing surface-enhanced Raman scattering sensitivity of surfactant-free Ag-Fe₃O₄ nanocomposites through optimization of silver nanoparticle density and magnetic self-assembly
Authors: Bao, ZY
Dai, J 
Lei, DY 
Wu, Y
Keywords: Decomposition
Magnetic field effects
Microspheres
Nanocomposites
Nanomagnetics
Optimization
Raman scattering
Self assembly
Substrates
Surface scattering
Issue Date: 28-Sep-2013
Publisher: American Institute of Physics
Source: Journal of applied physics, 28 Sept. 2013, v. 114, no. 12, 124305, p. 1-7 How to cite?
Journal: Journal of applied physics 
Abstract: Magnetic composite nanomaterials consisting of more than two functional constituents have been attracting much research interests due to the realization of multiple functionalities in a single entity. In particular, integration of ferromagnetic oxides and noble metal nanoparticles (NPs) in composites results in simultaneous magnetic activity and optical response where the optical property of the whole system could be modulated by application of an external magnetic field. In this work, we prepared Ag NPs-coated Fe₃O₄ microspheres as a novel surfactant-free surfaceenhanced Raman scattering (SERS) substrate through a solid-phase thermal decomposition reaction. The SERS sensitivity of the fabricated nanocomposites is maximized by adjusting the size and density of Ag NPs supported on the Fe₃O₄ microspheres and further increased by magneticfield-directed self-assembly of the composite substrates, with both effects attributed to the efficient generation of plasmonic near-field “hot” spots. At the optimal conditions, the prepared substrate is capable of detecting rhodamine 6G molecules at a concentration down to 10⁻¹² M, thus demonstrating the great potential of using bifunctional nanocomposites as an excellent candidate for ultra-high sensitive Raman spectroscopy and biosensors. We also reveal the underlying mechanisms responsible for the observed SERS enhancements through full-wave numerical simulations.
URI: http://hdl.handle.net/10397/6083
ISSN: 0021-8979
EISSN: 1089-7550
DOI: 10.1063/1.4823732
Rights: Copyright 2013 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.
The following article appeared in Bao, Z. Y., Dai, J., Lei, D. Y., et al. (2013). J. Appl. Phys, 114, 124305 (2013) http://dx.doi.org/10.1063/1.4823732 and may be found at http://scitation.aip.org/content/aip/journal/jap/114/12/10.1063/1.4823732.
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