Graphene pressure sensor material and its preparation method and pressure sensor
A pressure sensor and graphene technology, applied in the field of pressure sensors, can solve the problems of limited detection range and low sensitivity of resistive pressure sensors, and achieve the effects of improving reliability and cycle stability, good sensitivity, and improving strain sensitivity
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[0055] The embodiment of the present invention also provides a preparation method of a graphene pressure sensor material, comprising:
[0056] S100, providing a graphene dispersion including graphene;
[0057] S200, injecting the graphene dispersion into a mold and freeze-forming to obtain a frozen ice layer in which the quality of graphene in each substantially equal-thickness sub-layer in the first direction is not completely the same, wherein each of the sub-layers is substantially mutually parallel to and perpendicular to said first direction;
[0058] S300, freeze-drying the frozen ice layer at -80°C to -20°C to obtain a graphene airgel three-dimensional network structure; and
[0059] S400, immersing the graphene airgel three-dimensional network structure in a mold with an elastic matrix stock solution for curing.
[0060] In step S100, the dispersant in the graphene dispersion includes at least water, so that the graphene dispersion can be further freeze-formed. The gr...
Embodiment 1
[0084] (1) Use a 3D printer to prepare a resin mold with cylindrical protrusions, pour polydimethylsiloxane into the mold, put it in an oven at 80°C for 3 hours, and remove it from the resin mold after curing to obtain a resin mold with Flexible mold for cylindrical grooves.
[0085] (2) Fill the graphene oxide aqueous dispersions with concentrations of 2, 4, 6, and 8 mg / mL into the four flexible groove molds respectively, and put them in a -80°C refrigerator for 0.5 h to form them into four densities. sub-freezing ice layer. The sub-frozen ice layer with a graphene concentration of 8 mg / mL was attached to the glass substrate, and the flexible groove mold was removed after bonding, so that the 8 mg / mL sub-frozen ice layer was transferred to the glass substrate. Subsequently, the sub-frozen ice layers with concentrations of 6, 4, and 2 mg / mL were sequentially transferred to the previous sub-frozen ice layer to obtain stacked frozen ice layers.
[0086] (3) Put the stacked fro...
Embodiment 2
[0091] (1) Use a 3D printer to prepare a resin mold with triangular prism-shaped protrusions. The included angle of the triangular prism is 60°. Polydimethylsiloxane is poured into the mold and cured in an oven at 95°C for 2 hours. The mold is peeled off to obtain a flexible mold with a gradient cross-section triangular prism.
[0092] (2) Prepare a composite aqueous dispersion of graphene oxide and silver nanowires, wherein the concentration of graphene oxide is 6 mg / mL, and the concentration of silver nanowires is 6 mg / mL. Inject it into a flexible mold, and put it into a -24°C refrigerator for 4 hours to form. Paste the frozen ice layer on the glass substrate, remove the flexible groove mold after bonding, and transfer the frozen ice layer to the glass substrate.
[0093] (3) Put the frozen ice layer into a freeze dryer for 24 hours to freeze-dry, and then thermally reduce it at 500 ° C for 3 hours to obtain a graphene airgel three-dimensional network structure with a grad...
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