Customized Preparation\nof Heat-Resistant Fully Flexible\nSensors Based on Coaxial 3D Printing

The conventional behavior recognition strategy for wearable\nsensors\nused in high-temperature environments typically requires an external\npower supply, and the manufacturing process is cumbersome. Herein,\nwe present a rational design strategy based on fully flexible printable\nmaterials and a customized device-manufacturing process for skin-conformable\ntriboelectric nanogenerator sensors. In detail, using high temperature-resistant\nink and 3D printing technology to manufacture a coaxial triboelectric\nnanogenerator (C-TENG) sensor, the C-TENG exhibits high stretchability\n(>400%), a wide working range (>250 °C), and high output\nvoltage\n(>100 V). The C-TENG can be worn on various parts of the human\nbody,\nproviding a robust skin–device interface that recognizes diverse\nhuman behaviors. Using machine learning algorithms, behaviors such\nas walking, running, sitting, squatting, climbing stairs, and falling\ncan be identified, achieving 100% behavior recognition accuracy through\nthe selective input and optimization of an appropriate dataset. This\npaper provides a research perspective for the customization, extension,\nand rapid fabrication of heat-resistant, fully flexible TENGs.