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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

Soft and stretchable organic thin-film-transistor active matrix.(a) Illustrations of active matrix. Upper left, whole structure. Upper right, structure of an OTFT cell on a rigid island with elastic conductor wiring. Lower, schematic structure of an OTFT cell on the rigid island, the light green box corresponds to the entire OTFT device. (b) Pictures of OTFT-active matrix. Left, 12 × 12 active matrix. Scale bar, 10 mm. Centre, magnified OTFT cells. Scale bar, 5 mm; Right, optical micrograph of the embedded OTFT. Scale bar, 500 μm. (c) Active matrix is relaxed (left) and stretched to about 60% (right). Scale bars, 20 mm.
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f3: Soft and stretchable organic thin-film-transistor active matrix.(a) Illustrations of active matrix. Upper left, whole structure. Upper right, structure of an OTFT cell on a rigid island with elastic conductor wiring. Lower, schematic structure of an OTFT cell on the rigid island, the light green box corresponds to the entire OTFT device. (b) Pictures of OTFT-active matrix. Left, 12 × 12 active matrix. Scale bar, 10 mm. Centre, magnified OTFT cells. Scale bar, 5 mm; Right, optical micrograph of the embedded OTFT. Scale bar, 500 μm. (c) Active matrix is relaxed (left) and stretched to about 60% (right). Scale bars, 20 mm.

Mentions: To demonstrate the potential of our printable elastic conductors for the design of large-area stretchable electronics, we choose two systems that fully utilize our inks. The first application is a stretchable organic transistor active matrix (Fig. 3). This integrated design is akin to stretchable devices reported by Rogers et al. but utilize organic transistors and printable elastic conductors, which are more scalable and mechanically robust than single-crystal Si and serpentine Au interconnects16. The 12 × 12 and 2 × 2 organic transistor active matrices are manufactured with soft, stretchability-gradient substrates (SGSs), in a hybrid rigid island-stretchable interconnect approach30313233. The diagram in Fig. 3a shows the design of the stretchable active matrix. In the SGS design, organic transistors are manufactured on non-stretchable, yet flexible, island-like regions. The organic transistor uses DNTT (dinaphtho[2,3-b:2′,3′-f]thieno[3,2-b]thiophene)34 as the active material, a high mobility (∼1–3 cm2 V−1 s−1) organic semiconductor. It has been shown to operate at low voltages and to be highly flexible35 and thermally stable36. The transistors are then embedded in PDMS sheets where wirings and interconnections are formed by printing elastic conductors. Completed devices, together with magnified views, are shown in Fig. 3b. As shown in Fig. 3c, the device is very soft (modulus: ∼0.5 MPa) and resilient to large deformations (∼60% strain). The detailed fabrication procedures are described in Methods, and Supplementary Fig. 13 (fabrication process of SGSs) and Supplementary Fig. 14 (print-wiring of elastic conductor).


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)

Soft and stretchable organic thin-film-transistor active matrix.(a) Illustrations of active matrix. Upper left, whole structure. Upper right, structure of an OTFT cell on a rigid island with elastic conductor wiring. Lower, schematic structure of an OTFT cell on the rigid island, the light green box corresponds to the entire OTFT device. (b) Pictures of OTFT-active matrix. Left, 12 × 12 active matrix. Scale bar, 10 mm. Centre, magnified OTFT cells. Scale bar, 5 mm; Right, optical micrograph of the embedded OTFT. Scale bar, 500 μm. (c) Active matrix is relaxed (left) and stretched to about 60% (right). Scale bars, 20 mm.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

f3: Soft and stretchable organic thin-film-transistor active matrix.(a) Illustrations of active matrix. Upper left, whole structure. Upper right, structure of an OTFT cell on a rigid island with elastic conductor wiring. Lower, schematic structure of an OTFT cell on the rigid island, the light green box corresponds to the entire OTFT device. (b) Pictures of OTFT-active matrix. Left, 12 × 12 active matrix. Scale bar, 10 mm. Centre, magnified OTFT cells. Scale bar, 5 mm; Right, optical micrograph of the embedded OTFT. Scale bar, 500 μm. (c) Active matrix is relaxed (left) and stretched to about 60% (right). Scale bars, 20 mm.
Mentions: To demonstrate the potential of our printable elastic conductors for the design of large-area stretchable electronics, we choose two systems that fully utilize our inks. The first application is a stretchable organic transistor active matrix (Fig. 3). This integrated design is akin to stretchable devices reported by Rogers et al. but utilize organic transistors and printable elastic conductors, which are more scalable and mechanically robust than single-crystal Si and serpentine Au interconnects16. The 12 × 12 and 2 × 2 organic transistor active matrices are manufactured with soft, stretchability-gradient substrates (SGSs), in a hybrid rigid island-stretchable interconnect approach30313233. The diagram in Fig. 3a shows the design of the stretchable active matrix. In the SGS design, organic transistors are manufactured on non-stretchable, yet flexible, island-like regions. The organic transistor uses DNTT (dinaphtho[2,3-b:2′,3′-f]thieno[3,2-b]thiophene)34 as the active material, a high mobility (∼1–3 cm2 V−1 s−1) organic semiconductor. It has been shown to operate at low voltages and to be highly flexible35 and thermally stable36. The transistors are then embedded in PDMS sheets where wirings and interconnections are formed by printing elastic conductors. Completed devices, together with magnified views, are shown in Fig. 3b. As shown in Fig. 3c, the device is very soft (modulus: ∼0.5 MPa) and resilient to large deformations (∼60% strain). The detailed fabrication procedures are described in Methods, and Supplementary Fig. 13 (fabrication process of SGSs) and Supplementary Fig. 14 (print-wiring of elastic conductor).

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