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a Schematic diagram of the linear SC device, b cross-sectional SEM images of the linear device based on RGO/PEDOT/PANI-modified cotton yarn, c the linear device can be stretched, bended, twisted, or knotted arbitrarily without damaging its integrity, while continuously powering a digital watch, d Ragone plots of our linear SC and its comparison with other linear devices, and e three SCs connected in series can easily power a digital watch for at least half an hour
