Preparation and properties of carbon nanotubes/reduced graphene oxide/polyurethane electrothermal color-changing sensing yarns
A strain sensing yarn with a polyurethane filament core and a three-dimensional conductive network made of carbon nanotubes and reduced graphene oxide as the sheath was designed to address the issues of low fastness,narrow strain range,and poor sensitivity of the flexible strain sensors.Thermochromic ink was used as the protective layer to create the strain sensing yarn with color-changing capabilities.The morphology and structure of the sensing yarn were examined by using an X-ray diffractometer,Fourier infrared spectrometer,and scanning electron microscope.A universal tensile testing machine and an electronic universal testing machine were used to evaluate the stability and sensing capability of the flexible strain sensor.It can be seen from the data that a three-dimensional conductive network with high conductivity is formed by carbon nanotubes scattered between reduced graphene oxide sheets.The color-changing sensor yarn has a sensitivity of up to 32.31 and a strain range of up to 100%,making it useful for detecting even the smallest movements of the human body.Moreover,it can rapidly heat up to 60℃at a low voltage of 4 V,realizing the extra feature of active color change.It presents a novel design idea for developing thermochromic materials and sensing materials with fast color response,customizable color,and high stability,and supports the use of carbon nanotubes in the field of flexible wearable.
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维普
