Issue 24, 2007
From the journal:

Journal of Materials Chemistry

Photoinduced electron-transfer processes of carbon nanohorns with covalently linked pyrenechromophores: charge-separation and electron-migration systems†

Atula S. D. Sandanayaka,a   Georgia Pagona,b   Jing Fan,c   Nikos Tagmatarchis,*b   Masako Yudasaka,c   Sumio Iijima,c   Yasuyuki Arakia  and  Osamu Ito*a  

* Corresponding authors

a Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Katahira, Aoba-ku, Sendai, Japan
E-mail: ito@tagen.tohoku.ac.jp
Fax: +81 22 2175608
Tel: +81 22 2175608

b Theoretical and Physical Chemistry Institute, National Hellenic Research Foundation, 48 Vass. Constantinou Ave., Athens, Greece
E-mail: tagmatar@eie.gr
Fax: +30 210 7273794
Tel: +30 210 7273835

c Fundamental and Environmental Research Laboratories, NEC Corporation, SORST-JST 34 Miyukigaoka, Tsukuba, Ibaraki, Japan

Abstract

Carbon nanohorns (CNHs) have been covalently functionalized with pyrene chromophores forming dispersible nanohybrids in CH2Cl2. Their photo-physical properties have been investigated by complementary steady-state and time-resolved absorption and fluorescence spectroscopies as well as electrochemistry. Upon photo-excitation of CNH–pyrene nanohybrids, in the presence of hexyl-viologen dication (HV2+) and a hole trap, the HV˙+ was accumulated in the polar organic solvent. This observation suggests that photoinduced charge-separation takes place, producing CNH˙−–pyrene˙+, which was further confirmed by observing pyrene˙+ in the nanosecond time-scale transient absorption spectra. From CNH˙−, an electron is migrated to HV2+ and a hole shifts from pyrene˙+ to the hole trap, which suppresses the back electron transfer resulting in the persistence of HV˙+.

Graphical abstract: Photoinduced electron-transfer processes of carbon nanohorns with covalently linked pyrene chromophores: charge-separation and electron-migration systems

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Article information

DOI
https://doi.org/10.1039/B618948B
Article type
Paper
Submitted
02 Jan 2007
Accepted
21 Mar 2007
First published
11 Apr 2007

J. Mater. Chem., 2007,17, 2540-2546

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Photoinduced electron-transfer processes of carbon nanohorns with covalently linked pyrene chromophores: charge-separation and electron-migration systems

A. S. D. Sandanayaka, G. Pagona, J. Fan, N. Tagmatarchis, M. Yudasaka, S. Iijima, Y. Araki and O. Ito, J. Mater. Chem., 2007, 17, 2540 DOI: 10.1039/B618948B

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