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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

Measurement of arm EMG signals with an elastic conductor electronic textile.(a) Pictures of the EMG measurement system, using elastic conductor. Scale bars, 25 mm. (b) Organic amplifier circuit. Above, picture of organic amplifier circuit. Scale bar, 1 mm. Below, circuit diagram. (c) Performance of the organic pseudo-complementary metal–oxide–semiconductor inverter. Above, VOUT-VIN curve. Below, inverter gain. (d) Frequency dependence of the amplifier gain. (e) EMG signals obtained through the elastic conductor attached to a forearm while opening (I) and closing a hand (II). Upper black line is the unamplified signal and lower red line is the signal amplified with the organic amplifier. Signals from muscle activity are observed when the hand is closed.
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f5: Measurement of arm EMG signals with an elastic conductor electronic textile.(a) Pictures of the EMG measurement system, using elastic conductor. Scale bars, 25 mm. (b) Organic amplifier circuit. Above, picture of organic amplifier circuit. Scale bar, 1 mm. Below, circuit diagram. (c) Performance of the organic pseudo-complementary metal–oxide–semiconductor inverter. Above, VOUT-VIN curve. Below, inverter gain. (d) Frequency dependence of the amplifier gain. (e) EMG signals obtained through the elastic conductor attached to a forearm while opening (I) and closing a hand (II). Upper black line is the unamplified signal and lower red line is the signal amplified with the organic amplifier. Signals from muscle activity are observed when the hand is closed.

Mentions: The second application explored is an e-textile or textile circuit board. We have realized an EMG measurement system, fully integrated on textiles, using our highly stretchable, highly conductive conductor. The detailed fabrication process is available in Methods. The elastic conductor can be printed on many unconventional substrates including textiles at room temperature; however, elevated temperatures may be used to reduce the vapourization time during the drying process. When printed on both sides of a stretchable cloth (Fig. 5a), the printed elastic conductors provide three main functionalities, namely, wiring on stretchy textiles, via interconnection and vital electrodes applicable to human skin. Water-proofing of devices, which is important when people sweat or wash devices, can be achieved by additional encapsulation layers formed by printing hydrophobic elastomers38.


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)

Measurement of arm EMG signals with an elastic conductor electronic textile.(a) Pictures of the EMG measurement system, using elastic conductor. Scale bars, 25 mm. (b) Organic amplifier circuit. Above, picture of organic amplifier circuit. Scale bar, 1 mm. Below, circuit diagram. (c) Performance of the organic pseudo-complementary metal–oxide–semiconductor inverter. Above, VOUT-VIN curve. Below, inverter gain. (d) Frequency dependence of the amplifier gain. (e) EMG signals obtained through the elastic conductor attached to a forearm while opening (I) and closing a hand (II). Upper black line is the unamplified signal and lower red line is the signal amplified with the organic amplifier. Signals from muscle activity are observed when the hand is closed.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

f5: Measurement of arm EMG signals with an elastic conductor electronic textile.(a) Pictures of the EMG measurement system, using elastic conductor. Scale bars, 25 mm. (b) Organic amplifier circuit. Above, picture of organic amplifier circuit. Scale bar, 1 mm. Below, circuit diagram. (c) Performance of the organic pseudo-complementary metal–oxide–semiconductor inverter. Above, VOUT-VIN curve. Below, inverter gain. (d) Frequency dependence of the amplifier gain. (e) EMG signals obtained through the elastic conductor attached to a forearm while opening (I) and closing a hand (II). Upper black line is the unamplified signal and lower red line is the signal amplified with the organic amplifier. Signals from muscle activity are observed when the hand is closed.
Mentions: The second application explored is an e-textile or textile circuit board. We have realized an EMG measurement system, fully integrated on textiles, using our highly stretchable, highly conductive conductor. The detailed fabrication process is available in Methods. The elastic conductor can be printed on many unconventional substrates including textiles at room temperature; however, elevated temperatures may be used to reduce the vapourization time during the drying process. When printed on both sides of a stretchable cloth (Fig. 5a), the printed elastic conductors provide three main functionalities, namely, wiring on stretchy textiles, via interconnection and vital electrodes applicable to human skin. Water-proofing of devices, which is important when people sweat or wash devices, can be achieved by additional encapsulation layers formed by printing hydrophobic elastomers38.

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