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Characterization and photoelectrochemical properties of nanostructured thin film composed of carbon nanohorns covalently functionalized with porphyrins

Pagona, Georgia and Sandanayaka, Atula S. D. and Hasobe, Taku and Charalambidis, Georgios and Coutsolelos, Athanassios G. and Yudasaka, Masako and Iijima, Sumio and Tagmatarchis, Nikos (2008) Characterization and photoelectrochemical properties of nanostructured thin film composed of carbon nanohorns covalently functionalized with porphyrins. JOURNAL OF PHYSICAL CHEMISTRY C, 112 (40). pp. 15735-15741.

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Official URL: http://pubs.acs.org/doi/abs/10.1021/jp805352y

Abstract

Carbon nanohoms (CNHs) covalently functionalized at the conical tips with porphyrin (H2P) moieties were used to construct photoelectrochemical solar cells. Electrophoretic deposition was applied to fabricate films of the modified CNHs onto optically transparent electrodes (OTE) while nanostructured SnO2 films were cast onto the OTE (OTE/SnO2). The CNH-H2P film on the nanostructured SnO2 electrode exhibited an incident photon to current conversion efficiency (IPCE) of 5.8% at an applied bias of +0.2 V vs SCE in a standard three-compartment electrochemical cell. The measured IPCE was found greater than the one observed for the sum of the single components, namely CNHs and H2P films onto the SnO2 electrode. Fluorescence lifetime measurements revealed that photoinduced electron transfer from the singlet excited state of the porphyrin to the nanohoms takes place, while direct electron injection from the reduced nanohorns to the conduction band of the SnO2 electrode occurs. These processes are responsible for the photocurrent generation.

Item Type:Article
Subjects:Material Science > Functional and hybrid materials
Material Science > Nanochemistry
Physical Science > Photonics
ID Code:1919
Deposited By:Farnush Anwar
Deposited On:15 Dec 2008 16:57
Last Modified:13 Jan 2009 09:38

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