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Flexible pressure-sensitive layer, preparation method and application

A pressure-sensitive layer, flexible technology, applied in the field of pressure detection, can solve the problems of small measurement range, large environmental pollution, complex pressure-sensitive layer preparation process, etc., to improve sensitivity and measurement range, improve dielectric properties and pressure-sensitive properties. Effect

Active Publication Date: 2022-07-01
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003]However, it is still difficult to realize flexible sensors with high resolution, precise sensitivity, ultra-wide measurement range, fast response and complex signal detection at low cost. conquered
A common defect of existing flexible pressure sensors is that the measurement range is small. After the pressure reaches a certain value, the slope of the sensitivity curve of the sensor decreases rapidly, resulting in a decrease in the linearity of the sensor. Another disadvantage is the preparation process of the pressure-sensitive layer. Complex, from the perspective of environmental protection, the environmental pollution is relatively large

Method used

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  • Flexible pressure-sensitive layer, preparation method and application
  • Flexible pressure-sensitive layer, preparation method and application
  • Flexible pressure-sensitive layer, preparation method and application

Examples

Experimental program
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Embodiment 1

[0030] like Figure 4 As shown, a preparation method of a flexible pressure-sensitive layer, the preparation method includes,

[0031] preparing a mold, the mold includes a side wall and a bottom wall, and a cavity enclosed by the side wall and the bottom wall;

[0032] In this example, as Figure 1 to Figure 3 As shown, the mold is printed by, for example, a 3D printer, and the size of the mold is 2cm*2cm*0.5cm. A through hole is provided on the opposite side wall, the through hole is used to draw out the electrode lead for applying the electric field, and the cavity enclosed by the side wall and the bottom wall is used to hold the prepared blended liquid.

[0033] The piezoelectric ceramics are pasted in the mold, and the piezoelectric ceramics are respectively pasted on a pair of opposite side walls of the mold in the cavity, and the piezoelectric ceramics respectively include sides passing through the pasted mold. wall extraction electrodes;

[0034] In this embodiment...

Embodiment 2

[0049] This embodiment provides a flexible pressure-sensitive layer, a preparation method and application thereof. The difference between this embodiment 2 and embodiment 1 is:

[0050] In the process of preparing the mixed solution, the nanoparticles are selected as nano-dielectric, the mass of the nano-dielectric is 25% of the mass of the solvent, and the solvent is epoxy resin.

[0051] During curing of the blend, different curing conditions are employed. Specifically, under the condition that the heating plate is kept at 60 degrees Celsius, the value of the voltage applied to the lead-out electrodes on the piezoelectric ceramic is 2.5KV, and when the temperature of the heating plate is kept constant at 60 degrees Celsius and the value of the voltage applied to the piezoelectric ceramic is 2.5KV , the curing of the blended liquid requires 4 hours to be completely cured, and the completely cured blended liquid is taken out from the mold to obtain the flexible pressure-sensi...

Embodiment 3

[0053] This embodiment provides a flexible pressure-sensitive layer, a preparation method and application thereof. The difference between this embodiment 3 and embodiment 2 is:

[0054] In the process of preparing the mixed solution, the nanoparticles are selected as nano metal particles, the mass of the nano metal particles is 5% of the mass of the solvent, and the solvent is polyester resin.

[0055] During curing of the blend, different curing conditions are employed. Specifically, under the condition that the heating plate is kept at 80 degrees Celsius, the value of the voltage applied by the piezoelectric ceramics is 4KV, and when the temperature of the heating plate is kept constant at 80 degrees Celsius and the value of the voltage applied to the piezoelectric ceramics is 4KV, the curing of the blend requires 2 After 1 hour, it was fully cured, and the fully cured blend liquid was taken out from the mold to obtain the flexible pressure-sensitive layer.

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Abstract

The invention provides a flexible pressure-sensitive layer, a preparation method and application. The preparation method comprises the following steps: preparing a mold, pasting piezoelectric ceramic into the mold, preparing a blending solution, transferring the blending solution into the mold, and curing the blending solution. The flexible pressure-sensitive layer prepared by the preparation method is applied to the capacitive flexible pressure sensor. According to the invention, by utilizing the property that the piezoelectric ceramic with high dielectric coefficient can generate a relatively strong polarization electric field, the arrangement of nano particles in the pressure-sensitive layer is controlled under the condition of applying conventional voltage, and the dielectric constant of the pressure-sensitive layer is improved. The capacitive flexible pressure sensor which is composed of the pressure-sensitive layer and has high sensitivity and a wide measurement range is obtained. And support is provided for developing flexible pressure sensors which are low in power consumption, high in performance and low in cost and are urgently needed in the fields of Internet of Things and artificial intelligence.

Description

technical field [0001] The invention relates to the technical field of pressure detection, in particular to the field of flexible sensors, in particular to a flexible pressure-sensitive layer, a preparation method and an application. Background technique [0002] Flexible pressure sensors generally include two layers of flexible electrodes and one flexible pressure-sensitive layer. Due to the advantages of high sensitivity, short response time, and wide detection range, flexible pressure sensors have been widely used in many emerging wearable flexible electronic devices in recent years, such as human motion monitoring equipment, medical and health equipment, etc. However, capacitive flexible pressure sensors composed of traditional metal materials and semiconductor materials as pressure-sensitive layers are usually limited by low toughness and flexibility, and poor wearing comfort, which is difficult to meet the requirements of electronic skin, smart clothing, implanted devi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L1/14G01L1/16
CPCG01L1/142G01L1/148G01L1/16
Inventor 余辉洋叶鑫潘逸飞陈泽方吴喆李义丰
Owner NANJING TECH UNIV
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