Journal article

Reduced graphene oxide and porphyrin. An interactive affair in 2-D

Wojcik A, Kamat P ...see all

ACS Nano, vol. 4, issue 11 (2010) pp. 6697-6706

  • 116

    Readers

    Mendeley users who have this article in their library.
  • 147

    Citations

    Citations of this article.
Sign in to save reference

Abstract

Photoexcited cationic 5,10,15,20-tetrakis(1-methyl-4-pyridinio)porphyrin tetra(p-toluenesulfonate) (TMPyP) undergoes charge-transfer interaction with chemically reduced graphene oxide (RGO). Formation of the ground-state TMPyP-RGO complex in solution is marked by the red-shift of the porphyrin absorption band. This complexation was analyzed by Benesi-Hildebrand plot. Porphyrin fluorescence lifetime reduced from 5 to 1 ns upon complexation with RGO, indicating excited-state interaction between singlet excited porphyrin and RGO. Femtosecond transient absorption measurements carried out with TMPyP adsorbed on RGO film revealed fast decay of the singlet excited state, followed by the formation of a longer-living product with an absorption maximum around 515 nm indicating the formation of a porphyrin radical cation. The ability of TMPyP-RGO to undergo photoinduced charge separation was further confirmed from the photoelectrochemical measurements. TMPyP-RGO coated conducting glass electrodes are capable of generating photocurrent under visible excitation. These results are indicative of the electron transfer between photoexcited porphyrin and RGO. The role of graphene in accepting and shuttling electrons in light-harvesting assemblies is discussed.

Author-supplied keywords

  • 2-D interactions
  • Electron transfer
  • Graphene oxide
  • Photocurrent
  • Porphyrin

Get free article suggestions today

Mendeley saves you time finding and organizing research

Sign up here
Already have an account ?Sign in

Find this document

Get full text

Authors

  • Aleksandra Wojcik

  • Prashant V. Kamat

Cite this document

Choose a citation style from the tabs below

Save time finding and organizing research with Mendeley

Sign up for free