A High-Efficiency Surface-Enhanced Raman Scattering Substrate Based on Silicon Nanowires Array Decorated with Silver Nanoparticles
| Autor: | Mingwang Shao, Ning-Bew Wong, Xia Fan, Shuit-Tong Lee, Hongwei Zhou, Mingliang Zhang, J. Antonio Zapien |
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| Rok vydání: | 2010 |
| Předmět: |
Materials science
Scattering business.industry Surface plasmon Analytical chemistry Substrate (electronics) Isotropic etching Silver nanoparticle Surfaces Coatings and Films Electronic Optical and Magnetic Materials symbols.namesake General Energy symbols Optoelectronics Physical and Theoretical Chemistry business Raman spectroscopy Raman scattering Plasmon |
| Zdroj: | The Journal of Physical Chemistry C. 114:1969-1975 |
| ISSN: | 1932-7455 1932-7447 |
| Popis: | We introduce a unique surface-enhanced Raman scattering (SERS) substrate, which is made of hierarchical nanoarrays comprising silicon nanowires (SiNWs) decorated with silver nanoparticles (AgNPs). SiNWs arrays were produced through chemical etching of n-Si(100) wafer, while AgNPs were directly grown on SiNWs through galvanic redox reaction without any organic contamination. Solid surface extinction spectrum revealed strong surface plasmon absorption in a broad range (from 200 to 1000 nm) indicating that surface plasmon induced by the incident laser could resonate with incident and scattering photons in a broad wavelength region. The 3D arrangement of the AgNPs@SiNWs array offered significant advantages over conventional planar geometry, where the long interaction distance favored multiple plasmon resonances and strong electromagnetic enhancement effect. The substrate exhibited strong surface-enhanced effect in Raman scattering with a few percent reproducibility in Raman signals. The observed enhancement f... |
| Databáze: | OpenAIRE |
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