Biomimetic Honeycomb-like Ti<sub>3</sub>C<sub>2</sub>T<sub><i>x</i></sub> MXene/Bacterial Cellulose Aerogel-Based Flexible Pressure Sensor for the Human–Computer Interface
Xinyu Hong, Zhijian Du, La Li, Kai Jiang, Di Chen, Guozhen Shen
Abstract
The pursuit of efficient and accurate human–computer interface design urgently requires high-performance sensors with pressure sensitivity, a wide detection range, and excellent cycling stability. Herein, a biomimetic honeycomb-like Ti 3 C 2 T x MXene/bacterial cellulose (BC) aerogel with a negative Poisson’s ratio (ν = −0.14) synthesized from the bidirectional freeze-drying method is used as the active material for a flexible pressure sensor, which exhibits high sensitivity (20.14 kPa –1 ), fast response time (100 ms), excellent mechanical durability (5000 cycles), and a low detection limit (responding to a grain of rice weighing about 0.022 g). Moreover, when assembled into the sandwich-structured bending sensor with the aerogel layer at just 0.8 mm in thickness, the aerogel-based device has a wide angular detection range (2.7–156.3°), high sensitivity (0.47 deg –1 ), and good robustness, proving outstanding electromechanical performance. Significantly, a smart glove consisting of five bending sensors fixed to the proximal knuckles and a flexible circuit board as the signal processing unit was designed for the identification of the shape, demonstrating its promising applications in the field of human–computer interaction.