Effect of graphene oxide on spectral-luminescenct properties of xanthene dye

Abstract

The effect of graphene oxide on the spectral and luminescent properties of xanthene dyes was studied. During the interaction of graphene oxide (GO) with a cationic dye, aggregation of Rhodamine 6G occurs, which is expressed as an increase in the optical density of the short-wavelength shoulder in the absorption spectrum of the dye. GO sheets can act as adsorption centers for dye molecules due to the influence of the Coulomb and intermolecular forces between GO and Rhodamine 6G. This effect is practically not pronounced for anionic dyes. The quenching of the dye fluorescence intensity in the presence of GO was observed. Fluorescence quenching was equal to 2.4 times for Eosin, 5.8 times for Bengal rose, and 22.1 times for Rhodamine 6G. As shown by spectral-kinetic measurements, the fluorescence lifetime was also decreased in this case. Dye fluorescence quenching occurs through the process of electron transfer from the dye to GO. The results obtained can be used for the photodegradation of organic dyes by using of composite materials with graphene oxide.

Keywords

• graphene oxide;
• xanthene dyes;
• conicity;
• absorption;
• luorescence;
• spectral-luminescent properties;
• quenching;