Biomimetic Honeycomb-like\nTi<sub>3</sub>C<sub>2</sub>T<sub><i>x</i></sub> MXene/Bacterial\nCellulose Aerogel-Based\nFlexible Pressure Sensor for the Human–Computer Interface

The pursuit of efficient and accurate human–computer\ninterface\ndesign urgently requires high-performance sensors with pressure sensitivity,\na wide detection range, and excellent cycling stability. Herein, a\nbiomimetic honeycomb-like Ti<sub>3</sub>C<sub>2</sub>T<sub><i>x</i></sub> MXene/bacterial cellulose (BC) aerogel with a negative\nPoisson’s ratio (ν = −0.14) synthesized from the\nbidirectional freeze-drying method is used as the active material\nfor a flexible pressure sensor, which exhibits high sensitivity (20.14\nkPa<sup>–1</sup>), fast response time (100 ms), excellent mechanical\ndurability (5000 cycles), and a low detection limit (responding to\na grain of rice weighing about 0.022 g). Moreover, when assembled\ninto the sandwich-structured bending sensor with the aerogel layer\nat just 0.8 mm in thickness, the aerogel-based device has a wide angular\ndetection range (2.7–156.3°), high sensitivity (0.47 deg<sup>–1</sup>), and good robustness, proving outstanding electromechanical\nperformance. Significantly, a smart glove consisting of five bending\nsensors fixed to the proximal knuckles and a flexible circuit board\nas the signal processing unit was designed for the identification\nof the shape, demonstrating its promising applications in the field\nof human–computer interaction.