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"Stretching the limits of elastic conductors"

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写真3 10MB 756KB Figure1: New elastic conductor demonstrates high stretchability and conductivity. A printed elastic conductor maintains high conductivity under strain. The light emitting diode (LED) continues to shine brightly even when stretched to five times its original length (bottom).

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Figure1-1: before stretching (Figure 1 top)

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Figure1-2: after stretching 5 times as long as the original length (Figure 1 bottom)

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Figure2: Transmission electron microscope images of self-formed Ag nanoparticles. Ag nanoparticles are formed by simply mixing micrometer-sized Ag flakes with other components and printing the composite paste, which originally does not include the nanoparticles. These high-density Ag nanoparticles bridge the conduction between micrometer-sized Ag flakes dispersed in fluorine rubber.

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Figure2-1: Figure2 top (low magnification)




Figure2-2: Figure2 bottom (high magnification)

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Figure3: Fabrication process of elastic conductor ink. The conductive ink is a composite paste consisting of Ag flakes, fluorine rubber, fluorine surfactant and organic solvent. Printing the paste gives rise to self-formation of Ag nanoparticles. (DAI-EL is the product name of the fluorine rubber used in the study, provided by Daikin Industries.)

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Figure3-1: Materials structure in Figure 3.

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Figure3-2: Just images in Figure 3-1.

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Figure4: Fully printed stretchable pressure/temperature sensors laminated on textiles. Stretchable pressure or temperature sensors can easily be laminated on textiles by hot pressing. The sensors can measure pressure or temperature precisely, even when stretched, due to the high conductivity and stretchability of the elastic conductors.

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Figure4-1: Figure 4 top left (before stretching)

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Figure4-2: Figure 4 bottom (with 120% strain)

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Figure4-3: Figure 4 top right (sensor)

写真5 33MB 122KB Figure5: LED-integrated pressure-sensing glove. Each fingertip pressure sensor mounted on this glove is connected to an LED. The intensity of the LEDs varies according to the pressure applied by the fingertips. The glove enables us to ascertain degrees of pressure, which are difficult to obtain just by examining images.


movie1 (16KB)

VIDEO: A printed elastic conductor maintains high conductivity under strain.


University of Tokyo researchers have developed an ultrathin, ultraflexible, protective layer and demonstrated its use by creating an air-stable, organic light-emitting diode (OLED) display. This technology will enable creation of electronic skin (e-skin) displays of blood oxygen level, e-skin heart rate sensors for athletes and many other applications.

Contact information

Dr. Takao Someya, Professor Department of Electrical Engineering and Information Systems
Department of Electrical Engineering and Information Systems
The University of Tokyo7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
TEL: (+81)-3-5841-0411 FAX: (+81)-3-5841-6709 URL: