Surface enhanced fluorescence on three dimensional silver nanostructure substrate

Abstract

Multi-dimensional metallic nanostructures were fabricated by self-assembling silver nanoparticles on 3-aminopropyltrimethoxysilane-modified glass substrate and using p-aminothiophenol molecule as a linker. Surface enhanced fluorescence was investigated for Rhodamine 6G fluorophore molecules on the prepared 2D and 3D substrates. The experimental observation showed that the 3D nanostructured substrate presented stronger fluorescence enhancement, comparing with what was observed on the 2D nanoparticle arrays. Higher intensity of local electric field and stronger coupling of surface plasmon resonance in 3D silver nanostructure enhanced the excitation and emission of fluorophore molecules more effectively, leading to a stronger fluorescence enhancement on 3D nanostructured substrate. The result suggests that a metallic substrate with 3D nanostructures can produce better fluorescence enhancement, which is important for studying the mechanism and expanding the potential applications of enhanced fluorescence effect.

Recent Progress on Plasmon-Enhanced Fluorescence

“…As a result, many researches have been performed to study the fluorescence enhancement on such NP substrate, particularly the relationship between the orientation and distance of the fluorescent molecules, as well as the environment effect, with respect to the substrate [49][50][51]. Due to the coupling effect between the emission of the fluorophore and the SPR band of the SNP array nanostructure, the intensity of PEF influenced by adjusting the distributed characteristics of the nanopartices arrays was also observed experimentally [52].…”

Preparation of Ag/Au bimetallic nanostructures and their application in surface‐enhanced fluorescence

“…. By comparing the peak at 558 nm from the prepared metal substrates with that from the reference substrate, we found that the greatest enhancement factor ( E f ) is about 8.4 based on the eqn : where I sample is the fluorescence intensity of the Rh6G monolayer on the Ag/Au dendritic substrate, I reference is the fluorescence intensity of Rh6G monolayer on the clean glass substrate, and I background is the background intensity of the spectra.…”

Resonant surface enhancement of Raman scattering of Ag nanoparticles on silicon substrates fabricated by dc sputtering

“…This type of structure possesses a very strong local EM field and "hotspots" were easy to form. 22 Hence, the samples showed strong SERS effects.…”