Laboratoire d'Electrochimie Physique et Analytique, Ecole Polytechnique Fédérale de Lausanne, Lausanne, Switzerland.
Nanoscale. 2010 Sep;2(9):1665-9. doi: 10.1039/c0nr00241k. Epub 2010 Jul 8.
Surface plasmon resonance (SPR) was observed when a planar close-packed assembly of gold nanoparticles (Au NPs) is adsorbed at the water|1,2-dichloroethane interface. Aqueous gold nanoparticles, 13 or 16 nm in diameter, are deposited at the interface by adding methanol to form a close-packed film with a visible gold mirror reflectance. By total internal reflection of a light beam on the interface, the angular dependence of the interfacial reflectivity was measured in a pseudo-Kretschmann configuration and compared to Fresnel simulations for a homogeneous gold film. The experimental angles for minimum reflectivity were found to match the simulated values. Then, the fluorescence of dye molecules co-adsorbed within 13 and 16 nm gold nanoparticles assemblies at the liquid|liquid interface was measured. The fluorescence intensity under SPR is revealed to be much greater than under total internal reflection conditions, yielding an enhancement factor of approximately 30 and 50 for 13 and 16 nm Au NPs assemblies, respectively. Also, the fluorescence lifetime was found to decrease under SPR conditions.
当平面密排的金纳米粒子（Au NPs）组装体被吸附在水|1,2-二氯乙烷界面时，会观察到表面等离子体共振（SPR）。通过向界面添加甲醇形成具有可见金镜反射率的密排膜，在界面处沉积直径为 13 或 16nm 的水性金纳米粒子。通过在界面上的光束全内反射，以伪 Kretschmann 配置测量界面反射率的角度依赖性，并将其与均匀金膜的菲涅耳模拟进行比较。实验得到的最小反射率角度与模拟值匹配。然后，测量了在液体|液体界面处共吸附在 13nm 和 16nm 金纳米粒子组装体中的染料分子的荧光。在 SPR 下的荧光强度比全内反射条件下的荧光强度大得多，对于 13nm 和 16nm Au NPs 组装体，分别得到约 30 和 50 的增强因子。此外，发现荧光寿命在 SPR 条件下降低。
