High-sensitivity capacitive flexible tactile sensor based on three-dimensional porous microstructure composite dielectric layer and its manufacturing method

Abstract

The invention discloses a high-sensitivity capacitive flexible touch sensor based on a three-dimensional porous microstructure composite medium layer and a preparation method thereof. A flexible isolation layer and a flexible polar plate are sequentially arranged on the upper and lower surfaces of the three-dimensional porous microstructure composite medium layer. And the flexible protective layer, the three-dimensional porous microstructure composite medium layer is based on polyurethane sponge as a template, and graphene / multi-walled carbon nanotubes / silicone rubber conductive composite material is a force-sensitive composite material. Wrapped graphene / multi-walled carbon nanotubes / silicone rubber composite conductive material obtained by self-assembly. The capacitive flexible tactile sensor of the present invention has good flexibility, detection sensitivity and dynamic response characteristics, and provides ideas for the design of a high-sensitivity flexible tactile sensor for intelligent robot electronic skin applications.

Description

technical field [0001] The invention belongs to the field of flexible tactile sensors, in particular to a high-sensitivity capacitive flexible tactile sensor based on a three-dimensional porous microstructure composite medium layer and a preparation method thereof, which can be used as an electronic skin to realize tactile perception. Background technique [0002] Electronic skin (e-skin) is one of the most cutting-edge research directions of intelligent materials and sensors, and it is also an emerging field in the development of contemporary electronic information industry. As an important part of electronic skin research, flexible tactile sensors are an important way for robots to perceive external environmental information, second only to vision, and one of the necessary media for robots to directly interact with the external environment or targets. Functional electronic skin has important scientific significance and application value for future intelligent robots to exp...

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Problems solved by technology

[0007] In order to improve the tactile perception sensitivity of the electronic skin, the present invention uses the polyurethane sponge three-dimensional skeleton as a template, adopts a self-assembly method, and prepares a three-dimensional composite conductive material by dipping and wrapping graphene / multi-walled carbon nanotubes / silicone rubber composite conductive materials on the surface of the polyurethane sponge three-dimensional skeleton. Conductive network, and used as a three-dimensional porous microstructure composite medium layer, a high-sensitivity capacitive flexible tactile sensor based on a three-dimensional porous microstructure composite medium layer and its preparation method are proposed, aiming to solve the problem of low sensitivity and stability of existing flexible tactile sensors Poor performance and cumbersome preparation process of the composite dielectric layer microstructure, and provide a feasible design scheme for the tactile perception of electronic skin in different application scenarios by regulating the electrical and mechanical properties of the three-dimensional porous microstructure composite dielectric layer

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