Porphyrin molecules boost the sensitivity of epitaxial graphene for NH3 detection

I. Iezhokin, D. den Boer, P. Offermans, M. Ridene, J.A.A.W. Elemans, G.P. Adriaans, C.F.J. Flipse

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The sensitivity of quasi-free standing epitaxial graphene for NH3 detection is strongly enhanced by chemical functionalization with cobalt porphyrins resulting in a detection limit well below 100 ppb. Hybridization between NH3 and cobalt porphyrins induces a charge transfer to graphene and results in a shift of the graphene Fermi-level as detected by Hall measurements and theoretically explained by electronic structure calculations.

Original languageEnglish
Article number065001
JournalJournal of Physics : Condensed Matter
Issue number6
Publication statusPublished - 15 Feb 2017


  • cobalt porphyrin functionalization
  • electronic structure calculations
  • NH adsorption
  • quasi-free standing epitaxial graphene
  • sensing


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