Real-time observation of ultrafast electron injection at graphene–Zn porphyrin interfaces

Dilshad Masih, Shawkat Mohammede Aly, Anwar Usman, Erkki Alarousu, Omar F. Mohammed

Research output: Contribution to journalArticlepeer-review

13 Scopus citations

Abstract

We report on the ultrafast interfacial electron transfer ( ET) between zinc( II) porphyrin ( ZnTMPyP) and negatively charged graphene carboxylate ( GC) using state- of- the- art femtosecond laser spectroscopy with broadband capabilities. The steady- state interaction between GC and ZnTMPyP results in a red- shifted absorption spectrum, providing a clear indication for the binding affinity between ZnTMPyP and GC via electrostatic and p- p stacking interactions. Ultrafast transient absorption ( TA) spectra in the absence and presence of three different GC concentrations reveal ( i) the ultrafast formation of singlet excited ZnTMPyP*, which partially relaxes into a long- lived triplet state, and ( ii) ET from the singlet excited ZnTMPyP* to GC, forming ZnTMPyP + and GC , as indicated by a spectral feature at 650- 750 nm, which is attributed to a ZnTMPyP radical cation resulting from the ET process.
Original languageEnglish (US)
Pages (from-to)9015-9019
Number of pages5
JournalPhys. Chem. Chem. Phys.
Volume17
Issue number14
DOIs
StatePublished - 2015

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