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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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Article information


Submitted
24 Dec 2014
Accepted
24 Feb 2015
First published
25 Feb 2015

Phys. Chem. Chem. Phys., 2015,17, 9015-9019
Article type
Paper

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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