Surface-enhanced fluorescence from silver fractallike nanostructures decorated with silver nanoparticles

Abstract

Fluorescence emission of fluorophore molecules in the close vicinity of a nanostructured metal surface can be enhanced through a local electromagnetic field with the help of surface plasmon resonance. The fluorescence enhancement effect is very sensitive to the topography and dielectric property of the metal substrate. In the current work, metal substrates with complex structures, which are made of silver fractallike structures and nanoparticles (NPs), are prepared through electrochemical reduction followed by physical deposition. The surface-enhanced fluorescence of Rhodamine 6G monolayer molecules deposited on the prepared complex substrates are investigated with the laser spectroscopic technique. The experimental results show that the fractallike structure decorated with silver NPs presents stronger fluorescence enhancement, compared with silver NPs or pure silver fractallike structures.

Recent Progress on Plasmon-Enhanced Fluorescence

“…Zheng investigated PEF effect from the complex metallic nanostructures composed of silver fractal nanostructure and nanoparticles. Compared with silver nanoparticles (AgNPs) or pure silver fractal-like structure, the PEF EF, as high as 12-fold, was obtained from the Rh6G molecules on the fractal-like structure decorated with nanoparticles, which highlight the importance of the effect of the dimensional number in fractal nanostructure [71]. Furthermore, the simultaneous observation of SERS and PEF from target molecules, such as Rh6G, MG molecules, on Ag fractal-like structure with proper excitation condition was reported, as shown in Figure 8 [72].…”

In Situ Growth of Low-Dimensional Silver Nanoclusters with Their Tunable Plasmonic and Thermodynamic Behavior

“…Such embedded metallic nanostructures are significantly used in various applications, such as optoelectronics, 1−3 catalysis, 4 detection, 5 and biomedicine. 6 In the field of plasmons, the noble metal nanoclusters, which are dispersed in a transparent glass matrix, exhibit both linear and nonlinear optical surface plasmon resonance (SPR) properties. These nanostructures are highly useful for surface-plasmon-based applications, like surface-enhanced fluorescence, 7 surface-enhanced Raman scattering, 8 and nanophotonic devices and circuits.…”

Controlling on the luminescence property of RE ionic and molecular optical centers with nanostructure system

“…衬底表面(如图3所示), 同时观察到了共振拉曼和荧 光光谱信号, 不仅证明了分形衬底良好的增强效应, 还为制备高灵敏度的增强衬底提供了新思路 [83] . 此 外, 通过研究衬底维数对表面增强荧光效应的影响 规律 [84,49] , 发现维数较高的纳米结构衬底通常表现 出更好的荧光增强效应.…”