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

Song Liang Cai; Yue Biao Zhang; Andrew B. Pun; Bo He; Jinhui Yang; Francesca M. Toma; Ian D. Sharp; Omar M. Yaghi; Jun Fan; Sheng Run Zheng; Wei Guang Zhang; Yi Liu

doi:10.1039/c4sc02593h

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

Song Liang Cai, Yue Biao Zhang, Andrew B. Pun, Bo He, Jinhui Yang, Francesca M. Toma, Ian D. Sharp, Omar M. Yaghi, Jun Fan, Sheng Run Zheng, Wei Guang Zhang, Yi Liu

Research output: Contribution to journal › Article › peer-review

307 Scopus citations

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.

Original language	English
Pages (from-to)	4693-4700
Number of pages	8
Journal	Chemical Science
Volume	5
Issue number	12
DOIs	https://doi.org/10.1039/c4sc02593h
State	Published - 28 Oct 2014
Externally published	Yes

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title = "Tunable electrical conductivity in oriented thin films of tetrathiafulvalene-based covalent organic framework",

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.",

author = "Cai, {Song Liang} and Zhang, {Yue Biao} and Pun, {Andrew B.} and Bo He and Jinhui Yang and Toma, {Francesca M.} and Sharp, {Ian D.} and Yaghi, {Omar M.} and Jun Fan and Zheng, {Sheng Run} and Zhang, {Wei Guang} and Yi Liu",

year = "2014",

month = oct,

day = "28",

doi = "10.1039/c4sc02593h",

language = "English",

volume = "5",

pages = "4693--4700",

journal = "Chemical Science",

issn = "2041-6520",

publisher = "Royal Society of Chemistry",

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TY - JOUR

T1 - Tunable electrical conductivity in oriented thin films of tetrathiafulvalene-based covalent organic framework

AU - Cai, Song Liang

AU - Zhang, Yue Biao

AU - Pun, Andrew B.

AU - He, Bo

AU - Yang, Jinhui

AU - Toma, Francesca M.

AU - Sharp, Ian D.

AU - Yaghi, Omar M.

AU - Fan, Jun

AU - Zheng, Sheng Run

AU - Zhang, Wei Guang

AU - Liu, Yi

PY - 2014/10/28

Y1 - 2014/10/28

N2 - 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.

AB - 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.

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U2 - 10.1039/c4sc02593h

DO - 10.1039/c4sc02593h

M3 - Article

AN - SCOPUS:84908396634

SN - 2041-6520

VL - 5

SP - 4693

EP - 4700

JO - Chemical Science

JF - Chemical Science

IS - 12

ER -

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

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