Investigation of photophysical and binding properties of Rose Bengal dye on graphene oxide and polyethyleneimine-functionalized graphene oxide nanocomposites

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.