Lee Jaebeom, Pang Yoonsoo
J Nanosci Nanotechnol. 2016 Feb;16(2):1629-32. doi: 10.1166/jnn.2016.12028.
Fluorescence from dye molecules dispersed in thin polymer layers increases by 20-25 times when a silver island film exists beneath the layer. Polymer layers of <100 nm thick cover the silver island film to minimize emission quenching from direct contact and also keep the dye molecules in close proximity to the metal nanosurface for possible fluorescence enhancements by silver island film. We report an ultrafast radiation process of ~400 ps lifetime from the surface plasmons of silver nanoparticles observed in time-resolved fluorescence of rhodamine 6G and DCM in thin polymer films coated on silver island surface. The ultrafast energy transfer and fluorescence from metal nanoparticles might be strongly related to the efficiency of metal-enhanced fluorescence.
当在聚合物薄层下方存在银岛膜时，分散在聚合物薄层中的染料分子发出的荧光会增强20至25倍。厚度小于100纳米的聚合物层覆盖在银岛膜上，以尽量减少因直接接触导致的发射猝灭，同时使染料分子与金属纳米表面保持紧密接触，从而有可能通过银岛膜增强荧光。我们报道了在涂覆于银岛表面的聚合物薄膜中，通过若丹明6G和二氯甲烷的时间分辨荧光观察到的银纳米颗粒表面等离子体激元约400皮秒寿命的超快辐射过程。金属纳米颗粒的超快能量转移和荧光可能与金属增强荧光的效率密切相关。
