Merlen A, Gadenne V, Romann J, Chevallier V, Patrone L, Valmalette J C
Université du Sud-Toulon-Var, IM2NP, Bâtiment R, La Garde Cedex, France.
Nanotechnology. 2009 May 27;20(21):215705. doi: 10.1088/0957-4484/20/21/215705. Epub 2009 May 6.
Aggregates of Au nanoparticles have been extremely easily obtained on glass substrates by physical sputtering under primary vacuum. With such a protocol, we demonstrate that it is possible to control the surface plasmon band absorption. Surface enhanced Raman spectroscopy (SERS) experiments were performed with methylene blue, zinc octacarboxyphthalocyanine, 4-aminothiophenol and cysteamine. The correlation between the absorption band and the wavelength giving the highest SERS intensity is clearly observed for methylene blue, in accordance with the electromagnetic enhancement theory. For the other molecules, effects of the chemical enhancement are also observed. In addition, we noticed a strong influence of the nature of the adsorbed molecule on the enhancement factor for a given wavelength. The origin of this feature is discussed in terms of resonant effects or multipolar surface plasmon modes.
通过在初级真空下进行物理溅射，极易在玻璃基板上获得金纳米颗粒聚集体。采用这种方法，我们证明了可以控制表面等离子体激元带吸收。使用亚甲基蓝、八羧基酞菁锌、4-氨基硫酚和半胱胺进行了表面增强拉曼光谱（SERS）实验。根据电磁增强理论，对于亚甲基蓝，清楚地观察到吸收带与给出最高SERS强度的波长之间的相关性。对于其他分子，也观察到了化学增强效应。此外，我们注意到对于给定波长，吸附分子的性质对增强因子有很大影响。从共振效应或多极表面等离子体激元模式的角度讨论了这一特征的起源。
