Flexible pressure sensing material, sensor and preparation method thereof
A technology for pressure sensors and sensing materials, applied in the field of sensors and their preparation, and flexible pressure sensing materials, can solve the problems of poor air permeability and uncomfortable wearing, and achieve good air permeability
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Embodiment 1
[0054] This embodiment introduces the flexible pressure sensing material used in the piezoresistive layer.
[0055] see image 3 , the flexible pressure sensing material includes a polymer fiber membrane 2 , nanowires 4 attached to the fiber surface of the polymer fiber membrane 2 , and a second conductive substance 3 . Wherein, the nanowire 4 is made of metal oxide or metal, and the second conductive substance 3 is attached to the nanowire 4 and / or the fiber surface of the polymer fiber membrane 2 .
[0056] The aforementioned nanowires 4 are used to provide a carrier for the second conductive substance 3 .
[0057] The principle of different conductive properties of the above-mentioned flexible pressure sensing materials under different pressures is as follows:
[0058] After being pressed, the contact area between the pair of microstructure electrodes 5 and the piezoresistive layer increases, and the nanowires 4 gather under pressure, and the second conductive substance 3...
Embodiment 2
[0068] This embodiment provides a flexible pressure sensor, see figure 1 , the flexible pressure sensor includes from bottom to top: a substrate layer, a pair of microstructure electrodes 5, a piezoresistive layer and a hydrophobic encapsulation layer 1.
[0069] Wherein, the substrate layer includes a biocompatible film 8 and a first conductive substance 7 coated on the biocompatible film 8 , and the side of the substrate layer coated with the first conductive substance 7 faces the microstructure electrode 5 . The side of the microstructure electrode 5 facing the piezoresistive layer has a first protrusion array structure. The material of the piezoresistive layer is the flexible pressure sensing material provided in Example 1. The above-mentioned electrodes are connected to the wire 6 to output current.
[0070] In one example, the above-mentioned flexible pressure sensor and wireless communication module are integrated to build a wireless flexible communication system to c...
Embodiment 3
[0084] see Figure 6 , this embodiment provides a method for preparing the flexible pressure sensing material described in Embodiment 1, the method comprising the following steps:
[0085] Step 11: Electrospinning is carried out by using a polymer solution to obtain a polymer fiber membrane 2, and the polymer solution is obtained by dissolving a polymer in an organic solvent.
[0086] Step 12: growing metal oxide nanowires in situ on the polymer fiber membrane 2 at least twice.
[0087] Step 13: Dip-coat the conductive solution on the polymer fiber membrane 2 attached with nanowires and dry to obtain a flexible pressure sensing material.
[0088] As mentioned above, in order to expand the specific surface area of the conductive substance, the in-situ growth of metal oxide nanowires (the carrier of the conductive substance) is performed on the polymer fiber membrane 2 at least twice. The increase of the specific surface area of the conductive substance improves the conduc...
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Abstract
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Application Information
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