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Issue 14, 2015
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Real-time observation of ultrafast electron injection at graphene–Zn porphyrin interfaces

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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 π–π 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.

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

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Publication details

The article was received on 24 Dec 2014, accepted on 24 Feb 2015 and first published on 25 Feb 2015


Article type: Paper
DOI: 10.1039/C4CP06050D
Phys. Chem. Chem. Phys., 2015,17, 9015-9019

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

    D. Masih, S. M. Aly, A. Usman, E. Alarousu and O. F. Mohammed, Phys. Chem. Chem. Phys., 2015, 17, 9015
    DOI: 10.1039/C4CP06050D

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