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Flexible passive pressure sensor, preparation method and wearable touch sensor

A pressure sensor and flexible technology, applied in the fields of wearable tactile sensors, preparation methods, and flexible passive pressure sensors, can solve the problems of incomplete solution of dispersion and lack of piezoelectric characteristics, so as to improve performance and energy harvesting, Increase the dielectric constant and piezoelectric coefficient, and the effect of simple device process

Active Publication Date: 2021-07-23
XIDIAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Unfortunately, the added functional material does not have piezoelectric properties; the functional material and BaTiO 3 The two materials of nanoparticles are not combined together, and the problem of dispersion is not completely solved

Method used

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  • Flexible passive pressure sensor, preparation method and wearable touch sensor
  • Flexible passive pressure sensor, preparation method and wearable touch sensor
  • Flexible passive pressure sensor, preparation method and wearable touch sensor

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Effect test

preparation example Construction

[0046] Such as figure 1 As shown, the preparation method of the flexible passive pressure sensor provided by the invention comprises the following steps:

[0047] S101: Add 1-2g of PVDF powder purchased from Aladdin into a beaker containing 7-10ml of dimethylformamide solution, place the beaker in a water bath at 50-70°C and stir for 1-3 hours to form a uniform and transparent paste slurry;

[0048] S102: Add 0.05 to 0.15 g of BaTiO with a core-shell structure 3 Add the @ZnO material into a beaker containing 3-5ml of dimethylformamide solution, and ultrasonically disperse it evenly for 30-60 minutes;

[0049] S103: Add the obtained white solution into the PVDF transparent paste slurry, and continue stirring at 50-70°C for 1-3 hours to form a uniform white paste-like slurry, and then place the slurry in a vacuum drying oven for 30-60 minutes To extract air bubbles present in the slurry;

[0050] S104: Slowly pour the slurry into the prepared mold, use a scraper to disperse ...

Embodiment 1

[0079] 1. First, dissolve 5-7g NaOH in 20-40ml deionized water to prepare a strong alkaline solution environment, and stir at room temperature for 10-20min to completely dissolve NaOH in deionized water. Add 0.6~0.8g Ba(Ac) to NaOH solution 2 , 0.2~0.3gTiO 2 , Continue to stir at room temperature for 30-60 minutes to disperse the solution evenly.

[0080] 2. Transfer the mixed solution to an autoclave, and heat it in an oven at 200°C for 24 hours to generate the target product BaTiO 3 .

[0081] 3. Centrifuge the obtained precipitate, wash the obtained product with deionization and ethanol respectively, and centrifuge for 5 to 7 times; dry the product at 60-80°C, and roast the obtained powder at 900-1100°C for 1-2 3h. That is, get 150-200nm BaTiO 3 Material.

[0082] 4. Add 1-2g PEG, 0.382g (0.19g, 0.57g, 0.76g) Zn(Ac) 2 Dissolve in 30-40ml of deionized water, stir at room temperature for 10-30min to dissolve completely.

[0083] 5. Add the product obtained in step 3 t...

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Abstract

The invention belongs to the technical field of novel flexible sensors, and discloses a flexible passive pressure sensor, a preparation method and a wearable tactile sensor. The preparation method comprises the steps of: adding PVDF powder into a beaker containing a dimethylformamide solution, and stirring to form pasty slurry; adding a BaTiO3@ZnO material with a core-shell structure into the beaker containing the dimethylformamide solution, and carrying out ultrasonic dispersion; adding the white solution into the PVDF transparent pasty slurry, continuing to stir to form uniform white pasty slurry, and placing and keeping the slurry in a vacuum drying oven; pouring the slurry into a manufactured mold, uniformly dispersing the slurry in the mold by using a scraper, keeping the mold in a vacuum drying oven, drying the slurry to form a piezoelectric film, and drying the piezoelectric film; and attaching aluminum foil electrodes to the upper and lower surfaces of the piezoelectric film, using a golden finger PI packaging device, connecting a direct-current high-voltage power supply with the upper and lower electrodes, and performing polarization to obtain the flexible piezoelectric pressure sensor. The sensor has relatively high electrical property output and sensitivity.

Description

technical field [0001] The invention belongs to the technical field of novel flexible sensors, and in particular relates to a flexible passive pressure sensor, a preparation method, and a wearable tactile sensor. Background technique [0002] In recent years, due to changes in living habits and dietary structure, various chronic health diseases have gradually emerged among young and middle-aged people, and the incidence rate is showing a rising trend. Going to the hospital for health checks not only causes a large number of medical equipment to be occupied, but also for People's daily life brings many inconveniences and troubles. Flexible wearable electronic devices are favored by people because of their small size, light weight, easy to carry, comfortable to wear, real-time monitoring, health and environmental protection, etc., showing unparalleled charm in the field of next-generation medical health monitoring. However, the existence of the battery increases the size and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L1/16
CPCG01L1/16
Inventor 程鹏飞张宝王莹麟王天亮陈嵘张华许录平
Owner XIDIAN UNIV
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