SERS Amplification from Self-Organized Arrays of Plasmonic Nanocrescents
详细信息 查看全文
- 作者：Maria Caterina Giordano ; Antonino Foti ; Elena Messina ; Pietro Giuseppe Gucciardi ; Davide Comoretto ; Francesco Buatier de Mongeot
- 刊名：ACS Applied Materials & Interfaces
- 出版年：2016
- 出版时间：March 16, 2016
- 年：2016
- 卷：8
- 期：10
- 页码：6629-6638
- 全文大小：538K
- ISSN：1944-8252
文摘
We report on the surface-enhanced Raman scattering (SERS) efficiency of self-organized arrays of Au nanocrescents confined on monolayers of polystyrene nanospheres. A dichroic SERS emission in the visible spectrum is observed due to the selective excitation of a localized surface plasmon (LSP) resonance along the “short axis” of the Au nanocrescents. Under these conditions SERS signal amplifications in the range of 103 have been observed with respect to a flat reference Au film. The far field and near field plasmonic response of Au nanocrescent arrays have been investigated as a function of the metal dose deposited onto the polymeric spheres. In this way, we show the possibility of simply tailoring the SERS emission by engineering the morphology of the plasmonic nanocrescents. We highlight the SERS activity of chains of satellite nanoclusters that decorate the border of each connected crescent and sustain isotropic high energy LSP resonances in the visible spectrum.