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

doi:10.1088/1361-648X/29/6/065001

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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Abstract

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 language	English
Article number	065001
Journal	Journal of Physics : Condensed Matter
Volume	29
Issue number	6
DOIs	https://doi.org/10.1088/1361-648X/29/6/065001
Publication status	Published - 15 Feb 2017

Keywords

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

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AU - Iezhokin, I.

AU - den Boer, D.

AU - Offermans, P.

AU - Ridene, M.

AU - Elemans, J.A.A.W.

AU - Adriaans, G.P.

AU - Flipse, C.F.J.

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AB - 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.

KW - cobalt porphyrin functionalization

KW - electronic structure calculations

KW - NH adsorption

KW - quasi-free standing epitaxial graphene

KW - sensing

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