NDLI: Graphene oxide sheets as a template for dye assembly: graphene oxide sheets induce H-aggregates of pyronin (Y) dye

Content Provider	Royal Society of Chemistry (RSC)
Author	Gür, Bahri Arık, Mustafa Şinoforoğlu, Mehmet Onganer, Yavuz Meral, Kadem
Copyright Year	2013
Abstract	The highly stable colloidal structure of graphene oxide (GO) in aqueous dispersion behaves as a platform for the molecular aggregation of dyes via a simple adsorption process. The interaction between dye and GO sheets is a critical factor for dye aggregation. Positively charged dyes interact with the negatively charged GO sheets in an aqueous dispersion via both electrostatic and π–π stacking interactions. The cationic nature of Pyronin Y (PyY) ensures that the dye molecules are quickly adsorbed on the GO sheets in the aqueous dispersion. GO–PyY composites with different ratios, which are stable for months, are prepared by simply mixing diluted aqueous dispersions of both components. Transition dipole–dipole interactions between the adsorbed dye molecules on the surface of the GO sheet causes the formation of H-aggregates of the dye at dilute concentrations. H-aggregates of PyY are characterized by spectroscopic techniques (UV-Vis, steady-state and time-resolved fluorescence spectroscopy). The morphology and thickness of the GO sheets and the dye adsorbed GO sheets were determined using atomic force microscopy (AFM) in tapping mode. AFM studies revealed that a great deal of PyY molecules interact on the edges of the GO sheets.
Starting Page	11832
Ending Page	11838
Page Count	7
File Format	HTM / HTML PDF
ISSN	20462069
Volume Number	3
Issue Number	29
Journal	RSC Advances
DOI	10.1039/c3ra40531a
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Spectroscopy Adsorption Atomic-force microscopy Graphene Staining Dipole Fluorescence London dispersion force
Content Type	Text
Resource Type	Article
Subject	Chemistry Chemical Engineering

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