Strain sensor with auxetic property prepared by using temperature-responsive cellulose
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초록
내용
Recent research on stretchable and wearable devices has focused on managing mechanical deformation. To minimize the distortion of flexible substrate, it is necessary to control its Poisson's ratio. In this study, we prepared composites with low or negative Poisson's ratios using temperature-responsive cellulose. Flexible auxetic sensors were fabricated combining a cellulose-derivative, conductive carbon particles, and a fabric. The porous networks were formed through directional melt crystallization and then transformed into shrunk structures due to cellulose hydrogel shrinkage upon temperature increase. The resulting composites had a wide sensing range of over 150%. When stretched vertically, the Poisson's ratio was negative, decreasing further to -0.08 with increased coating thickness. The composites also showed over 300 cycles of repeatability. This work holds potential for flexible device applications and strategies for porous materials with promising properties in various fields.