Jump to main content
Jump to site search
PLANNED MAINTENANCE Close the message box

Scheduled maintenance work on Wednesday 21st October 2020 from 07:00 AM to 07:00 PM (BST).

During this time our website performance may be temporarily affected. We apologise for any inconvenience this might cause and thank you for your patience.


Issue 22, 2017
Previous Article Next Article

Thionine–graphene oxide covalent hybrid and its interaction with light

Author affiliations

Abstract

Graphene oxide sheets (GO) were covalently functionalized with thionine molecules. The obtained hybrid material, Th–GO, was characterized by means of scanning electron microscopy (SEM), Auger electron spectroscopy (AES), Fourier transform infrared spectroscopy (FTIR) and Raman spectroscopy. Subsequently, the interaction of light with the free dye molecules and with dye molecules bound to the graphene oxide sheets was probed via UV-Vis spectroscopy, fluorescence spectroscopy and femtosecond pump–probe spectroscopy. The experimental results proved that thionine was successfully grafted onto the GO sheets, however, only one of the two amino groups of thionine was always involved in the amide bond formation. The Th–GO hybrid suspended in N,N-dimethylformamide (DMF) exhibited suppressed fluorescence as compared to the free dye in the same solvent, pointing to an efficient interaction between the photoexcited dye and the graphene sheets. Yet, no electron transfer products were detected by transient absorption measurements, even though there was a shortening of the singlet excited state lifetime of thionine (from the 567 ps for the free dye to the 313 ps for the dye in Th–GO). These results can be rationalized in terms of a fast back electron transfer process or possibly an energy transfer process.

Graphical abstract: Thionine–graphene oxide covalent hybrid and its interaction with light

Back to tab navigation

Supplementary files

Article information


Submitted
26 Feb 2017
Accepted
12 May 2017
First published
22 May 2017

Phys. Chem. Chem. Phys., 2017,19, 14412-14423
Article type
Paper

Thionine–graphene oxide covalent hybrid and its interaction with light

E. Krzyszkowska, J. Walkowiak-Kulikowska, S. Stienen and A. Wojcik, Phys. Chem. Chem. Phys., 2017, 19, 14412
DOI: 10.1039/C7CP01267E

Social activity

Search articles by author

Spotlight

Advertisements