Method for preparing high-sensitivity flexible piezoresistive sensor based on fractured microstructure
A piezoresistive sensor and high-sensitivity technology, which is applied in the field of flexible wearable device preparation, can solve the problems of wearable piezoresistive sensors such as low sensitivity, complex preparation process, and unstable performance, and achieve mass production, good conductive network, The effect of high electron transport ability
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Embodiment 1
[0040] A high-sensitivity flexible piezoresistive sensor designed based on fractured microstructure, including: polyurethane sponge, carbon nanotube solution and electrodes. Specifically, it is achieved through the following processes:
[0041]1) Carbon nanotube solution preparation: Weigh a small amount of carbon nanotubes and dissolve them in sodium dodecyl sulfate solution, and disperse them in an ice bath using an ultrasonic cell disperser to obtain a carbon nanotube solution.
[0042] 2) Preparation of conductive carbon nanotube sponge: Soak the polyurethane sponge in the carbon nanotube solution prepared in step 1), take it out and drain after 1 min, first use a centrifuge to remove excess solution on the surface, and then dry it in an oven.
[0043] 3) Pre-pressing treatment of conductive carbon nanotube sponge: through a press and a customized mold with a thimble (see figure 2 ), applying pre-pressure to the prepared conductive carbon nanotube sponge in step 2), so t...
Embodiment 2
[0055] In the present embodiment, adopt foam to be density 50kg / m 3 Polyurethane foam, the size of polyurethane foam is 6cm×4cm×1.5cm, the water absorption rate is 2%, the porosity is 96%; the concentration of carbon nanotubes is 0.9wt.%; the pre-pressure applied by the press is 90%, and the diameter of the customized mold ejector About 4mm. The conductive carbon nanotube sponge is prepared by adsorbing the carbon nanotube solution on the polyurethane sponge, and then the carbon nanotube network structure is anchored by the pre-pressing process to increase the contact area between the carbon nanotubes in the deformed state (see Figure 4 ), and finally add electrodes at both ends of the sponge, and prepare a high-sensitivity flexible piezoresistive sensor based on the fracture microstructure design.
[0056] Finally, a flexible piezoresistive sensor that can accurately detect pulse beating can be fabricated.
Embodiment 3
[0058] In the present embodiment, adopt foam to be density 60kg / m 3 Polyurethane foam, the size of polyurethane foam is 3cm×3cm×1.5cm, the water absorption rate is 3%, the porosity is 97%; the concentration of carbon nanotubes is 0.9wt.%; the pre-pressure applied by the press is 95%, and the diameter of the customized mold ejector pin about 5mm. The conductive carbon nanotube sponge is prepared by adsorbing the carbon nanotube solution on the polyurethane sponge, and then the carbon nanotube network structure is anchored by the pre-pressing process to increase the contact area between the carbon nanotubes in the deformed state (see Figure 4 ), and finally add electrodes at both ends of the sponge, and prepare a high-sensitivity flexible piezoresistive sensor based on the fracture microstructure design. Finally, a flexible piezoresistive sensor that can accurately detect the beating of the heart can be fabricated.
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