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    Stretchable Electronics that Quadruple in length

    February 29, 2016, Categories  Physics, Technology/Electronics

    Intrinsically stretchable biphasic gold–gallium thin films. A) False color scanning electronic microscopy (SEM) image of a slightly tilted cross-section of the biphasic gold–gallium film on a PDMS substrate. The blue, yellow and gray colors correspond to the PDMS substrate, the biphasic AuGa2/Ga film, and a gallium bulge in the background, respectively. Scale bar: 500 nm. B) False color SEM image of the surface of the biphasic gold–gallium film. The yellow and gray colors correspond to the AuGa2/Ga film and the liquid Gallium, respectively. Color mask was obtained from backscattered electron detector (BSE) image. Scale bar: 5 μm. C) X-ray diffraction pattern of a biphasic gold–gallium film deposited on a PDMS substrate clearly indicating the position of the peaks corresponding to AuGa2 intermetallic compound (ICDD PDF Card 01-072-5268). Inset: the increase in baseline signal around 35° is attributed to liquid gallium. D) Picture of a biphasic gold–gallium film patterned by photolithography with critical dimension of 100 μm on a 40 μm thick poly(dimethylsiloxane) (PDMS) elastomer membrane. Scale bar: 5 mm; Inset scale bar: 500 μm. E) Stretchable multilayered matrix of green surface mounted light emitting diodes interconnected and powered through biphasic gold–gallium conductors. Scale bar: 15 mm. Inset: the LEDs are interconnected with two biphasic conductor planes; scale bar: 2 mm.

    Intrinsically stretchable biphasic gold–gallium thin films. A) False color scanning electronic microscopy (SEM) image of a slightly tilted cross-section of the biphasic gold–gallium film on a PDMS substrate. The blue, yellow and gray colors correspond to the PDMS substrate, the biphasic AuGa2/Ga film, and a gallium bulge in the background, respectively. Scale bar: 500 nm. B) False color SEM image of the surface of the biphasic gold–gallium film. The yellow and gray colors correspond to the AuGa2/Ga film and the liquid Gallium, respectively. Color mask was obtained from backscattered electron detector (BSE) image. Scale bar: 5 μm...

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