The interaction of iron andmetal-freemeso-Tetra (4-Sulfonatophenyl) porphines with CVD graphene: A comparative Raman spectroscopy study

Denys Naumenko*, Iuliia Naumenko, Nora Grinceviciute, Valentinas Snitka

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

In this work, a non-covalent interaction of iron and metal-free meso-tetra (4-sulfonatophenyl) porphines (FeTPPS and TPPS, respectively)with high-quality single-layer graphene is studied by Raman spectroscopy. Such a kind of graphene functionalization is promising for a development of novel optoelectronic devices and sensors. Our results show that the central metal atom of porphyrin macrocycle, iron particularly, plays an important role in the integrity of FeTPPS on graphene surface; however, the predicted Raman enhancement is not significant. The interaction of metal-free TPPS with graphene leads to the deprotonation of TPPS molecules and higher Raman enhancement values. Moreover, initially deprotonated TPPS solutions after the adsorption onto the graphene surface demonstrate the appearance of new Raman bands and significantly enhanced Raman signals. We propose that a strong interaction between deprotonated TPPS and graphene is realized through pyrrole and desulfonated phenyl rings of closely located planar TPPS molecules on the graphene surface. The results show that both the protonation of porphyrin macrocycle and the existence of central metal atom are crucial for a formation of nanocomposites with defined electronic properties.

Original languageEnglish
Pages (from-to)94-99
Number of pages6
JournalJournal of Raman spectroscopy
Volume46
Issue number1
DOIs
Publication statusPublished - 17 Nov 2015
Externally publishedYes

Keywords

  • Enhancement
  • Graphene
  • Porphyrin
  • Raman spectroscopy

ASJC Scopus subject areas

  • Materials Science(all)
  • Spectroscopy

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