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CN-122016096-A - Flexible dual-mode touch sensor and preparation method thereof

CN122016096ACN 122016096 ACN122016096 ACN 122016096ACN-122016096-A

Abstract

The flexible double-mode touch sensor comprises a carbon-based electrode layer, a PVDF/GCN composite medium layer and a PVDF/GCN composite medium layer, wherein the carbon-based electrode layer is formed by mixing a multi-wall carbon nano tube and graphene and is printed into an interdigital electrode structure through dispensing, the PVDF/GCN composite medium layer is positioned above the carbon-based electrode layer and is tightly combined with the carbon-based electrode layer, and non-contact distance sensing and contact pressure detection double-mode sensing is realized through the synergistic effect of the composite medium layer and the interdigital electrode layer. The flexible double-mode touch sensor and the preparation method thereof simultaneously realize the double-mode functions of high-sensitivity pressure detection and long-distance non-contact touch control, and have the advantages of excellent flexibility, interface bonding strength and large-area manufacturing.

Inventors

  • LI ZHIJUN
  • Cong Chenhao
  • QIU FENG
  • LI ZHIQUAN

Assignees

  • 国科大杭州高等研究院

Dates

Publication Date
20260512
Application Date
20260318

Claims (10)

  1. 1. A flexible dual-mode tactile sensor comprising: the carbon-based electrode layer is formed by mixing a multi-wall carbon nano tube and graphene, and is printed into an interdigital electrode structure through dispensing; And the PVDF/GCN composite medium layer is positioned above the carbon-based electrode layer and is tightly combined with the carbon-based electrode layer, and the non-contact distance sensing and contact pressure detection dual-mode sensing is realized through the synergistic effect of the composite medium layer and the interdigital electrode layer.
  2. 2. The flexible dual mode tactile sensor of claim 1 wherein the mass ratio of PVDF to GCN is 100:0.5-2.
  3. 3. The flexible dual mode tactile sensor of claim 2, wherein the mass ratio of PVDF to GCN is 100:0.5, 100:1, or 100:2.
  4. 4. The flexible dual-mode tactile sensor of claim 1 wherein said carbon-based electrode layer is subjected to a multi-stage annealing treatment after dispensing and printing with a glass substrate, said multi-stage annealing treatment comprising room temperature curing, 70 ℃ heat treatment and 300-400 ℃ high temperature annealing, and transferred to said PVDF/GCN composite media layer by transfer means.
  5. 5. The method of manufacturing a flexible dual mode tactile sensor according to any one of claims 1-4, comprising the steps of: s1, preparing carbon-based conductive ink, namely adding multi-wall carbon nanotubes and graphene into a mixed solvent of deionized water and absolute ethyl alcohol, adding a dispersing agent and an adhesive, and carrying out ultrasonic treatment and magnetic stirring to obtain uniformly dispersed conductive ink; S2, preparing PVDF/GCN composite medium layer ink, namely adding GCN into DMF for ultrasonic treatment, adding PVDF, and magnetically stirring for 20-24 hours at 60-80 ℃ and 300rpm to obtain composite medium layer ink; S3, forming an interdigital electrode structure on the glass substrate through dispensing printing, namely printing by using a 27G pinhead by using a dispensing printing technology, wherein the distance between the pinhead and the substrate is 0.1mm, the printing speed is 5-6mm/S, the printing pressure is 2-5kPa, and performing multi-stage curing treatment on the printed interdigital electrode, namely curing at room temperature, heat treatment at 70 ℃ and high-temperature annealing at 300-400 ℃; and S4, performing dispensing printing on the PVDF/GCN composite medium layer on the surface of the cured interdigital electrode, namely heating the carrier plate to 70 ℃ to accelerate curing in the printing process by adopting a dispensing printing technology, and mechanically stripping the cured composite film from the glass substrate to obtain the flexible dual-mode touch sensor.
  6. 6. The method of claim 5, wherein the mass ratio of the multiwall carbon nanotubes to graphene in step S1 is 0.11:0.04, and the mass ratio of deionized water to absolute ethanol is 6:1.5.
  7. 7. The method for manufacturing a flexible dual-mode tactile sensor according to claim 5, wherein the dispersing agent in the step S1 is PSS, the adding amount is 0.3g, the adhesive is PEO, and the adding amount is 0.2g.
  8. 8. The method for manufacturing a flexible dual-mode tactile sensor according to claim 5, wherein the ultrasonic treatment time in the step S1 is 30-90min, the magnetic stirring temperature is 50 ℃ and the time is 24h.
  9. 9. The method of manufacturing a flexible dual-mode tactile sensor according to claim 5, wherein the ratio of GCN to DMF in step S2 is 100 parts DMF per 0.5-2 parts GCN, and the ultrasonic treatment time is 30min.
  10. 10. The method for manufacturing a flexible dual-mode tactile sensor according to claim 5, wherein in the step S3, a 27G pinhead is adopted for the dispensing printing, the distance between the pinhead and a substrate is 0.1mm, the printing speed is 5-6mm/S, and the printing pressure is 2-5kPa; Or the multi-stage curing treatment in the step S3 is specifically that the multi-stage curing treatment is carried out at room temperature, then the multi-stage curing treatment is carried out at 70 ℃ and finally the multi-stage curing treatment is carried out at 300-400 ℃ in a high-temperature annealing mode; Or in the printing process of the composite medium layer in the step S4, the heating temperature of the carrier plate is 70 ℃, the printing pressure is 2kPa, and the printing speed is 5mm/S; or, the thickness of the composite dielectric layer in the step S4 is 20-100 μm; Or, the mechanical stripping in the step S4 is gradually stripped from the edge of the glass substrate, so that the high-fidelity transfer of the electrode structure is realized.

Description

Flexible dual-mode touch sensor and preparation method thereof Technical Field The invention belongs to the technical field of capacitive flexible sensors, and particularly relates to a flexible dual-mode touch sensor and a preparation method thereof. Background In recent years, with rapid development in the fields of smart home, wearable equipment, man-machine interaction and the like, higher requirements are put on functional diversity of the touch sensor. The traditional single-mode pressure sensor can only provide contact pressure information, can not sense the approaching state of an object, and is difficult to meet the requirements of complex and changeable application scenes. For example, in the field of smart home, it is difficult for a single-function sensor to realize multi-dimensional man-machine interaction, if the proximity degree and the contact pressure of an object can be sensed simultaneously, home equipment can pre-judge user intention according to the proximity condition and adjust the response state according to the pressure, so that the intelligent level and the user experience of the system are remarkably improved. In intelligent wearing equipment field, the user is to the functional integration level of equipment and data richness requirement increase increasingly, but the proximity perception monitoring equipment is with human distance variation, and the stress condition in the motion process can be obtained in real time to the pressure perception, and the two combines the health monitoring data that can provide more accurate and motion feedback information for the user. Currently, in the prior art, part of research on dual-mode sensors integrating proximity sensing and pressure sensing has been carried out, and related achievements are mainly focused on aspects of material compounding, structural design, signal decoupling and the like. However, the whole research of the dual-mode sensor is still in a starting stage, and the prior art has the defects that firstly sensitive materials are limited in selection, high sensitivity, wide response range and good flexibility are difficult to be simultaneously considered, secondly the structure design of the device is complex, the preparation process is complex, the large-scale low-cost manufacturing is not facilitated, thirdly the decoupling and processing of dual-mode signals have crosstalk problems, and the detection precision and reliability are affected. Therefore, there is still a need for intensive research in material system optimization, structural innovation design, signal processing mechanism, and the like. Therefore, how to optimize the composite system of the sensitive material to give consideration to high sensitivity and flexibility, how to simplify the structural design of the dual-mode sensor to solve signal crosstalk and be suitable for large-area manufacturing, and provide a capacitive flexible dual-mode sensor with excellent performance and simple process, which is a technical problem to be solved by those skilled in the art. Disclosure of Invention A first object of the present invention is to provide a flexible dual-mode tactile sensor that addresses the problems of the prior art. For this purpose, the above object of the present invention is achieved by the following technical solutions: a flexible dual-mode tactile sensor comprising: the carbon-based electrode layer is formed by mixing a multi-wall carbon nano tube and graphene, and is printed into an interdigital electrode structure through dispensing; And the PVDF/GCN composite medium layer is positioned above the carbon-based electrode layer and is tightly combined with the carbon-based electrode layer, and the non-contact distance sensing and contact pressure detection dual-mode sensing is realized through the synergistic effect of the composite medium layer and the interdigital electrode layer. The invention can also adopt or combine the following technical proposal when adopting the technical proposal: As a preferable technical scheme of the invention, the mass ratio of PVDF to GCN is 100:0.5-2. As a preferable technical scheme of the invention, the mass ratio of PVDF to GCN is 100:0.5, 100:1 or 100:2. According to the preferred technical scheme, the carbon-based electrode layer is subjected to multi-stage annealing treatment after being subjected to glass substrate dispensing printing, wherein the multi-stage annealing treatment comprises room temperature curing, 70 ℃ heat treatment and 300-400 ℃ high-temperature annealing, and then is transferred onto the PVDF/GCN composite medium layer in a transfer printing mode. A second object of the present invention is to provide a method for manufacturing a flexible dual-mode tactile sensor, which addresses the problems of the prior art. For this purpose, the above object of the present invention is achieved by the following technical solutions: the preparation method of the flexible dual-mode touch sensor comprises the f