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Highly reproducible SERS substrate based on polarization-free Ag nanoparticles decorated SiO2
/Si core-shell nanowires array
9.M. Ringler, T. A. Klar, A. Schwemer, A. S. Susha, J. Stehr, G. Raschke, S. Funk, M. Borowski, A. Nichtl, K. Kurzinger, R. T. Phillips, and J. Feldmann, Nano Lett. 7, 2753 (2007).
10.J. A. Huang, Y. Q. Zhao, X. J. Zhang, L. B. Luo, Y. K. Liu, J. A. Zapien, C. Surya, and S. T. Lee, Appl. Phys. Lett. 98, 183108 (2011).
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SiO2/Si core-shell nanowires array coated with gap-rich silver
nanoparticles were demonstrated as a highly reproducible surface-enhanced Raman scattering
(SERS) substrate. SERS detection of a relative standard deviation of 8% for 10−4 M R6G with a spot size of ∼2 μm and 900 spots over an area of 150 × 150 μm2 was reported. The high reproducibility is ascribed to the polarization-independent electrical field distribution among three-dimensional nanowire
structure with an optimized thickness of SiO2 shell layer.
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