Rhodamine 101–graphene oxide composites in aqueous solution: the fluorescence quenching process of rhodamine 101

Abstract

The interaction of rhodamine 101 (Rh101) with graphene oxide (GO) in aqueous dispersion was examined using advanced spectroscopic techniques. Rh101-GO composites in water were easily prepared by mixing an aqueous solution of both components since GO sheets interacted with the cationic dyes via π-π and electrostatic cooperative interactions. In the composites, the fluorescence of Rh101, which was a well-known laser dye with a high fluorescence quantum yield, could be efficiently quenched by GO. The quenching mechanism of Rh101 by GO sheets was evaluated by the Stern-Volmer (SV) equation and the time-resolved fluorescence studies. The results revealed that the fluorescence quenching of Rh101 by GO in the aqueous dispersion is due to the static quenching mechanism. The formation of the Rh101-GO composites at various pH values was spectroscopically monitored, and the spectroscopic results revealed that the composites were formed at the pH values studied except in the strong acidic media (pH ≈ 2). The interaction of Rh101 with GO in aqueous solution was spectroscopically followed in the presence of SDS (sodium dodecyl sulphate) at the surfactant concentrations above and below the CMC (critical micelle concentration). The fluorescence studies revealed that the fluorescence of Rh101 in the aqueous solution remarkably increased at the surfactant concentration forming the micelle of SDS.

A study on the interaction between molybdenum disulfide and rhodamine B by spectroscopic methods

“…This may be due to the interaction between the RhB molecules and MoS 2 nanosheets in the composite. Thus, we can expect the possibility of static quenching from the formation of ground state RhB-MoS 2 complex [32]. Yet, the role of dynamic quenching cannot be eliminated at this moment.…”

Phthalocyanine-loaded graphene nanoplatform for imaging-guided combinatorial phototherapy

“…Our data is in good agreement with previous reports, which indicated that interaction between fluorophore and graphene oxide results in red-shifting of the absorption maximum of the fluorophore. 44,45 Because of the availability of the second emission peak at 820 nm, the fluorescence signal of Pc could be recorded in the far NIR region ( Figure 2D, inset), avoiding tissue autofluorescence and light scattering for effective imaging. In contrast, LOGr-LHRH, similar to nonmodified LOGr, does did possess any fluorescence emission within the same NIR region ( Figure 2D).…”

Polyelectrolytes-assisted layer-by-layer assemblies of graphene oxide and dye on glass substrate

“…One intriguing property of dye molecules is the presence of molecular aggregation playing an essential role in many technological applications as photographic industry, photosensitization, molecular optoelectronic devices, light-harvesting biological systems and nonlinear optical materials owing to their unexcelled optical behaviors. 17,20 In the present study, the fabrication of polyelectrolyteassisted LbL lm compose of PyY and GO was reported. The driving forces in the associations are electrostatic interactions (Coulomb, van der Waals etc.…”

“…PyY, which is a positively charged organic dye compound, is a xanthene derivative such as acridines and rhodamines, and it is comprehensively researched in the literature. [17][18][19][20][21][22] The morphology and thicknesses of LbL lm can be easily controlled by adjusting the number of layers, immersion time, temperature, 23 ionic strength 19 and pH. Molecular aggregates are formed due to a highly ordered association of dye molecules.…”