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Printable elastic conductors with a high conductivity for electronic textile applications.

Matsuhisa N, Kaltenbrunner M, Yokota T, Jinno H, Kuribara K, Sekitani T, Someya T - Nat Commun (2015)

Bottom Line: The development of advanced flexible large-area electronics such as flexible displays and sensors will thrive on engineered functional ink formulations for printed electronics where the spontaneous arrangement of molecules aids the printing processes.The elastic conductor ink is comprised of Ag flakes, a fluorine rubber and a fluorine surfactant.The fluorine surfactant constitutes a key component which directs the formation of surface-localized conductive networks in the printed elastic conductor, leading to a high conductivity and stretchability.

View Article: PubMed Central - PubMed

Affiliation: 1] Electrical and Electronic Engineering and Information Systems, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan [2] Advanced Leading Graduate Course for Photon Science (ALPS), 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.

ABSTRACT
The development of advanced flexible large-area electronics such as flexible displays and sensors will thrive on engineered functional ink formulations for printed electronics where the spontaneous arrangement of molecules aids the printing processes. Here we report a printable elastic conductor with a high initial conductivity of 738 S cm(-1) and a record high conductivity of 182 S cm(-1) when stretched to 215% strain. The elastic conductor ink is comprised of Ag flakes, a fluorine rubber and a fluorine surfactant. The fluorine surfactant constitutes a key component which directs the formation of surface-localized conductive networks in the printed elastic conductor, leading to a high conductivity and stretchability. We demonstrate the feasibility of our inks by fabricating a stretchable organic transistor active matrix on a rubbery stretchability-gradient substrate with unimpaired functionality when stretched to 110%, and a wearable electromyogram sensor printed onto a textile garment.

No MeSH data available.


Related in: MedlinePlus

Stretchable organic transistors with stretchability-gradient substrate.(a) Device structure of a stretchable single transistor. Top, schematic from top surface. Centre, schematic from side, the green box corresponds to an entire OTFT device. Bottom, device picture. Scale bar, 5 mm. (b) Robustness evaluation with different concentrations of curing agent in PDMS 1. (PDMS 1 is patterned on stiff polyimide during the fabrication process of this substrate). Red circles, normalized strain-to-failure; blue squares, normalized failure stress. Error bars represent s.e. (c) Single stretchable transistor mobility dependence on tensile strain. Red circles represent normalized mobility. Scale bars, 3 cm. The inset shows the transistor relaxed (upper) and stretched (100%, lower). (d) Transfer characteristics of a relaxed and stretched single organic transistor corresponding to (c,e) mobility dependence on tensile strain of four transistors in a 2 × 2 stretchable active matrix. Scale bars, 1 cm. The inset shows the device in relaxed (upper) and stretched (110%, lower) configurations. (f) Transfer characteristics of one transistor in a stretchable active matrix corresponding to e.
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f4: Stretchable organic transistors with stretchability-gradient substrate.(a) Device structure of a stretchable single transistor. Top, schematic from top surface. Centre, schematic from side, the green box corresponds to an entire OTFT device. Bottom, device picture. Scale bar, 5 mm. (b) Robustness evaluation with different concentrations of curing agent in PDMS 1. (PDMS 1 is patterned on stiff polyimide during the fabrication process of this substrate). Red circles, normalized strain-to-failure; blue squares, normalized failure stress. Error bars represent s.e. (c) Single stretchable transistor mobility dependence on tensile strain. Red circles represent normalized mobility. Scale bars, 3 cm. The inset shows the transistor relaxed (upper) and stretched (100%, lower). (d) Transfer characteristics of a relaxed and stretched single organic transistor corresponding to (c,e) mobility dependence on tensile strain of four transistors in a 2 × 2 stretchable active matrix. Scale bars, 1 cm. The inset shows the device in relaxed (upper) and stretched (110%, lower) configurations. (f) Transfer characteristics of one transistor in a stretchable active matrix corresponding to e.

Mentions: With this design, a stretchable single transistor and active matrix are fabricated. Figure 4a shows the design of a stretchable single transistor. A transistor on a non-stretchable substrate is embedded in the stretchable PDMS and the three electrode pads are wired with the elastic conductor with a width and length of 500 μm and 3 cm, respectively. The Young's modulus and thickness of the PDMS layers are reduced gradually in expanding concentric circles from the rigid islands. To fabricate these structures, PDMS with a relatively high concentration (12.5 wt%) of curing agent (PDMS 1) is first patterned around stiff polyimide islands and then covered by PDMS with less (5 wt%) curing agent (PDMS 2). During the curing process, the curing agent diffuses37 and forms a gradient of stiffness.


Printable elastic conductors with a high conductivity for electronic textile applications.

Matsuhisa N, Kaltenbrunner M, Yokota T, Jinno H, Kuribara K, Sekitani T, Someya T - Nat Commun (2015)

Stretchable organic transistors with stretchability-gradient substrate.(a) Device structure of a stretchable single transistor. Top, schematic from top surface. Centre, schematic from side, the green box corresponds to an entire OTFT device. Bottom, device picture. Scale bar, 5 mm. (b) Robustness evaluation with different concentrations of curing agent in PDMS 1. (PDMS 1 is patterned on stiff polyimide during the fabrication process of this substrate). Red circles, normalized strain-to-failure; blue squares, normalized failure stress. Error bars represent s.e. (c) Single stretchable transistor mobility dependence on tensile strain. Red circles represent normalized mobility. Scale bars, 3 cm. The inset shows the transistor relaxed (upper) and stretched (100%, lower). (d) Transfer characteristics of a relaxed and stretched single organic transistor corresponding to (c,e) mobility dependence on tensile strain of four transistors in a 2 × 2 stretchable active matrix. Scale bars, 1 cm. The inset shows the device in relaxed (upper) and stretched (110%, lower) configurations. (f) Transfer characteristics of one transistor in a stretchable active matrix corresponding to e.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4491189&req=5

f4: Stretchable organic transistors with stretchability-gradient substrate.(a) Device structure of a stretchable single transistor. Top, schematic from top surface. Centre, schematic from side, the green box corresponds to an entire OTFT device. Bottom, device picture. Scale bar, 5 mm. (b) Robustness evaluation with different concentrations of curing agent in PDMS 1. (PDMS 1 is patterned on stiff polyimide during the fabrication process of this substrate). Red circles, normalized strain-to-failure; blue squares, normalized failure stress. Error bars represent s.e. (c) Single stretchable transistor mobility dependence on tensile strain. Red circles represent normalized mobility. Scale bars, 3 cm. The inset shows the transistor relaxed (upper) and stretched (100%, lower). (d) Transfer characteristics of a relaxed and stretched single organic transistor corresponding to (c,e) mobility dependence on tensile strain of four transistors in a 2 × 2 stretchable active matrix. Scale bars, 1 cm. The inset shows the device in relaxed (upper) and stretched (110%, lower) configurations. (f) Transfer characteristics of one transistor in a stretchable active matrix corresponding to e.
Mentions: With this design, a stretchable single transistor and active matrix are fabricated. Figure 4a shows the design of a stretchable single transistor. A transistor on a non-stretchable substrate is embedded in the stretchable PDMS and the three electrode pads are wired with the elastic conductor with a width and length of 500 μm and 3 cm, respectively. The Young's modulus and thickness of the PDMS layers are reduced gradually in expanding concentric circles from the rigid islands. To fabricate these structures, PDMS with a relatively high concentration (12.5 wt%) of curing agent (PDMS 1) is first patterned around stiff polyimide islands and then covered by PDMS with less (5 wt%) curing agent (PDMS 2). During the curing process, the curing agent diffuses37 and forms a gradient of stiffness.

Bottom Line: The development of advanced flexible large-area electronics such as flexible displays and sensors will thrive on engineered functional ink formulations for printed electronics where the spontaneous arrangement of molecules aids the printing processes.The elastic conductor ink is comprised of Ag flakes, a fluorine rubber and a fluorine surfactant.The fluorine surfactant constitutes a key component which directs the formation of surface-localized conductive networks in the printed elastic conductor, leading to a high conductivity and stretchability.

View Article: PubMed Central - PubMed

Affiliation: 1] Electrical and Electronic Engineering and Information Systems, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan [2] Advanced Leading Graduate Course for Photon Science (ALPS), 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.

ABSTRACT
The development of advanced flexible large-area electronics such as flexible displays and sensors will thrive on engineered functional ink formulations for printed electronics where the spontaneous arrangement of molecules aids the printing processes. Here we report a printable elastic conductor with a high initial conductivity of 738 S cm(-1) and a record high conductivity of 182 S cm(-1) when stretched to 215% strain. The elastic conductor ink is comprised of Ag flakes, a fluorine rubber and a fluorine surfactant. The fluorine surfactant constitutes a key component which directs the formation of surface-localized conductive networks in the printed elastic conductor, leading to a high conductivity and stretchability. We demonstrate the feasibility of our inks by fabricating a stretchable organic transistor active matrix on a rubbery stretchability-gradient substrate with unimpaired functionality when stretched to 110%, and a wearable electromyogram sensor printed onto a textile garment.

No MeSH data available.


Related in: MedlinePlus