Ultrafast dynamics on fluorescence quenching of rhodamine 6G by graphene oxide

Abstract

Fluorescence quenching of rhodamine 6G by graphene oxide (GO) was investigated using steady‐state fluorescence spectroscopy and ultrafast time‐resolved absorption spectroscopy. The steady‐state fluorescence spectra showed that rhodamine 6G fluorescence was effectively quenched by titrating the GO to the rhodamine 6G solutions. For lower GO concentrations, transient dynamic curves followed two‐exponential decay parameters. For higher GO concentrations, the dynamic curves could not be fitted well, and three‐exponential decay parameters were appropriate. The results indicated that there was a new transition process (electron transfer) in the exited rhodamine 6G and GO solution.

Investigating Ultrafast Electron Transfer in Graphene and Its Derivatives Composites by Femtosecond Transient Absorption Spectroscopy

“…Next, we specifically analyze the application of TAS in such composite materials. Dunli Liu et al [37] used fluorescence spectroscopy and TAS to study the fluorescence quenching effect of different concentrations of GO on R6G, as shown in Figure 6(a-c). The authors investigated the Reproduced with permission.…”

“…The authors investigated the Reproduced with permission. [37] Copyright 2021, Wiley-VCH. (d) The GSB signal decay kinetics of RdB and RdB-(R)GO at 560 nm (λex = 490 nm); (e) The ET mechanism in RdB-(R)GO.…”

“…Figure 6. TAS of rhodamine 6G in (a) presence and (b) absence of 200μg/mL GO (λex = 400 nm); (c) Normalized transient decay kinetics of rhodamine 6G and GO solutions at 550 nm.Reproduced with permission [37]. Copyright 2021, Wiley-VCH.…”

Biosensing Systems Based on Graphene Oxide Fluorescence Quenching Effect

“…Driven by their potential impact on energy technology, graphene and GO have been widely characterized for the energy/charge transfer between them and other donors or acceptors. GO is commonly considered a fluorescence quencher for fluorophores [ 18 , 19 , 20 ] and fluorescent biomolecules [ 21 , 22 , 23 ], mainly due to energy transfer, electron transfer and non-radiative dipole–dipole coupling channels [ 24 ]. Albeit fluorescence enhancement effects may occur under certain conditions (as described at the end of this section), GO is typically considered a fluorescence quencher and is used as such for sensing applications.…”