Nanomaterials, Vol. 13, Pages 1702: A Flexible Piezocapacitive Pressure Sensor with Microsphere-Array Electrodes
Nanomaterials doi: 10.3390/nano13111702
Flexible pressure sensors that emulate the sensation and characteristics of natural skins are of great importance in wearable medical devices, intelligent robots, and human&ndash;machine interfaces. The microstructure of the pressure-sensitive layer plays a significant role in the sensor&rsquo;s overall performance. However, microstructures usually require complex and costly processes such as photolithography or chemical etching for fabrication. This paper proposes a novel approach that combines self-assembled technology to prepare a high-performance flexible capacitive pressure sensor with a microsphere-array gold electrode and a nanofiber nonwoven dielectric material. When subjected to pressure, the microsphere structures of the gold electrode deform via compressing the medium layer, leading to a significant increase in the relative area between the electrodes and a corresponding change in the thickness of the medium layer, as simulated in COMSOL simulations and experiments, which presents high sensitivity (1.807 kPa&minus;1). The developed sensor demonstrates excellent performance in detecting signals such as slight object deformations and human finger bending.
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