▎ 摘　　要

Herein, the photophysical properties and interactions of Rose Bengal are examined using UV-Vis absorption techniques and fluorescence spectroscopy under two different reaction conditions, namely in the COOH-rich graphene oxide and in polyethyleneimine with graphene oxide (PEI-GO) nanocomposite dispersion solutions. The PEI-GO nanocomposite had a positively charged surface area containing a -CONH functional group which had been modified by covalent bonds. The molecular interactions of the dye compound in these media were found to be different. Graphic abstract