Fabrication of stretchable transparent conductors that use silver (Ag) nanowire films. (a) Schematic illustration of the fabrication process of the stretchable transparent conductor. A Ag nanowire film is transferred onto a prestrained PDMS. After the strain of the PDMS is released, a stretchable transparent conductor is formed. Digital camera image of a Ag nanowire film that was transferred from a membrane filter to the prestrained PDMS substrate on a stretch stage is shown at the bottom of the figure. (b) Scanning electron microscope (SEM) image of the Ag nanowire film (180 mg/m2) that was transferred onto a biaxially prestrained PDMS. Ag nanowires buckle on the substrate. (c) Close-up SEM image of the Ag nanowire film. The long Ag nanowires are flexible and can be easily bent. (d) Optical transmittance spectrum of a conductor that uses 180 mg/m2 Ag nanowire film, measured with a UV-visible spectrometer, without including the substrate. Inset: Digital camera image of the Ag nanowire transparent conductor.
(a) and (b) Normalized resistance (R/R0) of 180 mg/m2 biaxially stretchable (black symbols), uniaxially stretchable (red symbols), and unstrained (blue symbols) Ag nanowire films with applied strain. R0 and R are the resistances before and after stretching respectively. Prestrain in the stretchable films was 10%. Strain was applied in both axes of a plane: (a) parallel (named x-axis) and (b) perpendicular (named y-axis) to the prestrain in the uniaxially stretchable Ag nanowire films. (c) R remains constant during 50 stretch and relax cycles for a 180 mg/m2 biaxially stretchable Ag nanowire film. The applied strain was 10%.
Normalized resistance (R/R0) of uniaxially stretchable Ag nanowire films with applied strain. Prestrain in the stretchable films were 10% (black symbols) and 20% (red symbols).
LED circuit connected by a stretchable transparent conductor (Ag nanowire film). The LED remains lit upon stretching, bending or twisting the stretchable Ag nanowire film.
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