中文摘要：

Fe ₃ O ₄@Ag 核心壳 nanoparticles 为出现玫瑰精的提高的荧光察觉 B (RB ) 被开发。Fe ₃ 有 Ag 壳和 Fe ₃4@Ag 核心壳 nanostructures > O ₄ 核心是由有 3-mercaptopropyl 的帮助的自我装配的方法的 synthetized trimethoxy silane (MPTS ) 。学习 RB 荧光由差距电浆子提高了，有不同 nanogap 的底层上的 RB 的荧光性质密度系统地被调查，并且结果证明 Fe ₃ O ₄@Ag 核心壳 NP 底层比的许多强壮在赤裸的玻璃上底层，并且荧光紧张是进一步的改善旁边使用的多层的 Fe ₃更高有 nanogap 的 O ₄@Ag 核心壳 NP 底层密度。与基于表面的最大的重叠的机制不同电浆子回声( SPR )乐队和排放乐队，在我们的工作的荧光改进的机制基于局部性的表面电浆子( LSP )和差距电浆子近地的结合 Fe ₃ O ₄@Ag 核心壳 NP 。而且，察觉限制获得了象 1 一样低吗？？

英文摘要：

A novel gap-plasmon of Fe3O4@Ag core-shell nanoparticles for surface enhanced fluorescence detection of Rhodamine B（RB） was developed. Fe3O4@Ag core-shell nanostructures with Ag shell and Fe3O4 core were synthetized by self-assembled method with the assistance of 3-mercaptopropyl trimethoxy silane（MPTS）. To study the RB fluorescence enhanced by gap-plasmon, the fluorescence properties of RB on the substrates with different nanogap densities were systematically investigated, and the results showed that the fluorescence intensity of RB on Fe3O4@Ag core-shell NPs substrate was much stronger than that on bare glass substrate, and the fluorescence intensity was further improved by using multilayer Fe3O4@Ag core-shell NPs substrate which had higher nanogap density. Different from the mechanism that is based on the maximum overlap of the surface plasmon resonance（SPR） band and emission band, the mechanism of the fluorescence enhancement in our work is based on the localized surface plasmon（LSP） and the gap plasmon near-field coupling with the Fe3O4@Ag core-shell NPs. Besides, the detection limit obtained was as low as 1×10~（-7） mol/L, and the Fe3O4@Ag core-shell NPs substrate had high selectivity for RB fluorophores. It was demonstrated that the Fe3O4@Ag core-shell NPs substrate had activity, good stability, and selectivity for fluorescence detection of RB. And the detection of RB by the surface plasmon enhanced fluorescence was more convenient and rapid than the traditional detection methods in previous works.