Fluorescence quenching of Rhodamine 6G with different concentrations by laser ablated gold nanoparticles

Abstract

Colloidal gold nanoparticles are prepared by laser ablation method and characterized by UV-Visible spectrometry and Transmission Electron Microscopy. Fluorescence quenching of Rhodamine 6G dye with different concentration, from 0.05 to 15 lM, in the presence of gold nanoparticles have been investigated. The optical absorption and fluorescence emission of samples are studied. Shift of the fluorescence peaks in the presence of gold nanoparticles are the same as the absorption peaks for different concentrations. The stokes shift of Rhodamine 6G in different concentrations with and without gold nanoparticles is constant. Experimental quantum yield are calculated. Due to the local field enhancement by gold nanoparticles, the absorbed power of the samples in presence of nanoparticles are increased and the fluorescence intensity and fluorescence quantum yield are decreased. Also, the energy transfer efficiency is measured. Experimental results showed that at dye concentration range of our studies the presence of gold nanoparticles in the mixture results in fluorescence quenching.

Absorption Characteristics of Magnesium Oxide and Aluminium Oxide NPs/ Rhodamine 6G/ Polyvinyl Alcohol Films

“…Presence of the metallic structures in the vicinity of the fluorophore can alter the optical properties of the fluorophore. There have been some attempts to show both quenching and enhancement of the fluorescence intensity of fluorophore can be introduced by NPs [13]. Kumar et al (2014) [14] studied both quenching and enhancement of the fluorescence intensity of the Rh6G with different dye concentrations, ranging from 3 to 300 µM, in presence of 15 nm diameter Au NPs.…”

Effects of Gold Nanoparticles on Fluorescence Polarization and Emission Spectra of Rhodamine 6G Solution

“…A large number of publications have been reported that when such a dye solution is mixed with Au MNPs, it possess a strong plasmon field. Its fluorescence emission also might quench or enhance extensively [5][6][7]. Our study is to better gain insight into this phenomenon and predict the extent of quenching and/or enhancement of fluorescence in terms of FP measurement.…”