Fig. 3: Effect of the number of parallel conducting monofilaments on strain-insensitive behavior. | npj Flexible Electronics

Fig. 3: Effect of the number of parallel conducting monofilaments on strain-insensitive behavior.

From: Ultrastretchable and wearable conductive multifilament enabled by buckled polypyrrole structure in parallel

Fig. 3

a Schematic diagram of parallel conducting monofilaments with buckling PPy coating. b Optical photos of \({{{\mathrm{PU}}}}_{50\% }^{420{{{\mathrm{D}}}}}\) @PPy and \({{{\mathrm{PU}}}}_{50\% }^{840{{{\mathrm{D}}}}}\) @PPy after breaking. Scale bar is 2 mm. c Relative resistance change of \({{{\mathrm{PU}}}}_{50\% }^x\) @PPy with different diameters upon increasing strain. SEM images of the cross-section of d \({{{\mathrm{PU}}}}_{200\% }^{420{{{\mathrm{D}}}}}\) @PPy and e \({{{\mathrm{PU}}}}_{200\% }^{420{{{\mathrm{D}}}}}\) @WPU@PPy. Scale bar is: 100 μm, inset 15 μm. f Change in relative resistance of the conductive multifilament and sheath-core filament under stretching. g Working mechanism of the parallel conductive multifilament under increasing strain. h Current path (yellow arrow) along the multifilament during stretching.

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