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Issue 12, 2014
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Tunable electrical conductivity in oriented thin films of tetrathiafulvalene-based covalent organic framework

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Abstract

Despite the high charge-carrier mobility in covalent organic frameworks (COFs), the low intrinsic conductivity and poor solution processability still impose a great challenge for their applications in flexible electronics. We report the growth of oriented thin films of a tetrathiafulvalene-based COF (TTF-COF) and its tunable doping. The porous structure of the crystalline TTF-COF thin film allows the diffusion of dopants such as I2 and tetracyanoquinodimethane (TCNQ) for redox reactions, while the closely packed 2D grid sheets facilitate the cross-layer delocalization of thus-formed TTF radical cations to generate more conductive mixed-valence TTF species, as is verified by UV-vis-NIR and electron paramagnetic resonance spectra. Conductivity as high as 0.28 S m−1 is observed for the doped COF thin films, which is three orders of magnitude higher than that of the pristine film and is among the highest for COF materials.

Graphical abstract: Tunable electrical conductivity in oriented thin films of tetrathiafulvalene-based covalent organic framework

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Publication details

The article was received on 26 Aug 2014, accepted on 16 Sep 2014 and first published on 16 Sep 2014


Article type: Edge Article
DOI: 10.1039/C4SC02593H
Author version available: Download Author version (PDF)
Citation: Chem. Sci., 2014,5, 4693-4700
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    Tunable electrical conductivity in oriented thin films of tetrathiafulvalene-based covalent organic framework

    S. Cai, Y. Zhang, A. B. Pun, B. He, J. Yang, F. M. Toma, I. D. Sharp, O. M. Yaghi, J. Fan, S. Zheng, W. Zhang and Y. Liu, Chem. Sci., 2014, 5, 4693
    DOI: 10.1039/C4SC02593H

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