Fluorescence Quenching of Sulforhodamine Dye over Graphene Oxide and Boron Nitride Nanosheets

Abstract

We report the fluorescence quenching of sulforhodamine 640 (SR 640) supported on graphene oxide (GO) and boron nitride (BN) nanosheets (NSs). The synthesis and characterization of both materials are described. X-ray diffraction (XRD), Raman spectroscopy, atomic force microscopy (AFM), transmission and scanning electron microscopy (TEM and SEM), and the Brunauer-Emmett-Teller (BET) method were used. The photophysical properties, such as the fluorescence lifetime and anisotropy of the SR dye over the synthesized materials, are reported. The observed fluorescence quenching of the SR dye over GO and BN occurs through an electron-transfer process. Fluorescence decay analysis of SR revealed different behavior in the presence of GO and BN NSs. Adsorption of the dye on GO NSs leads to a non-fluorescent complex, whereas adsorption of the dye on BN NSs results in quenching induced by a decrease in the fluorescence lifetime of the dye.