基于图形化铌酸钾钠纳米棒阵列的自供电压力传感器

Micro/nano-scaled pressure sensors that can detect the pressure from an external environment to analyze the location, quantity, and configuration of the applied force, are in high demand for electronic screen, electronic skin, motion monitoring, artificial tactile system and several other fields. In this study, a pressure sensor matrix that can realize the two-dimensional pressure mapping is successfully developed by utilizing the patterned piezoelectric (K,Na)NbO3 (KNN) nanorod arrays. The as-synthesized orthorhombic KNN nanorods exhibit outstanding mechanical flexibility and elasticity, together with high piezoelectric performance, which render outstanding piezoelectric response towards mechanical stimulation by external forces. A high sensitivity of single unit up to 0.20 V N−1 is achieved, with a detection limit down to 20 g and excellent stability, thanks to the highly flexible and elastic properties of the sensitive KNN nanorods. The micro sensor matrix with each unit separated spatially facilitates the detection of the pressure distribution in the effective areas with no cross-interference, which can accurately realize a self-powered pressure mapping and precisely analyze the mechanical stimulations.