imec vzw, Kapeldreef 75, Leuven, Belgium.
Nanoscale. 2012 Mar 7;4(5):1606-11. doi: 10.1039/c2nr11805j. Epub 2012 Feb 2.
Detailed understanding of the underlying mechanisms of surface enhanced Raman scattering (SERS) remains challenging for different experimental conditions. We report on an excitation wavelength dependent SERS of 4-aminothiophenol molecules on gold nanorings. SERS and normal Raman spectra, combined with well-characterized surface morphology, optical spectroscopy and electromagnetic (EM) field simulations of gold nanoring substrates indicate that the EM enhancement occurs at all three excitation wavelengths (532, 633 and 785 nm) employed but at short wavelengths (532 and 633 nm) charge transfer (CT) results in additional strong enhancements of particular Raman transitions. These results pave the way to further understanding the origin of the SERS mechanism.
详细了解表面增强拉曼散射（SERS）的基本机制对于不同的实验条件仍然具有挑战性。我们报告了金纳米环上 4-巯基苯胺分子的激发波长相关 SERS。SERS 和普通拉曼光谱，结合金纳米环衬底的表面形貌、光学光谱和电磁场（EM）场模拟的详细研究表明，在所有三个激发波长（532、633 和 785nm）下都发生了 EM 增强，但在短波长（532 和 633nm）下，电荷转移（CT）导致特定拉曼跃迁的额外强烈增强。这些结果为进一步理解 SERS 机制的起源铺平了道路。
