JST ERATO Someya Bio-harmonized Electronics Project

Figure1-1: before stretching (Figure 1 top)

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

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.

Figure2-1: Figure2 top (low magnification)

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Figure2-2: Figure2 bottom (high magnification)

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.)

Figure3-1: Materials structure in Figure 3.

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

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.

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

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

Figure4-3: Figure 4 top right (sensor)