Super-hydrophobic piezoresistive pressure sensor and preparation method thereof, and application of super-hydrophobic piezoresistive pressure sensor

A pressure sensor and water pressure technology, which is applied in the measurement of the property force of piezoelectric resistance materials, etc., can solve the problems of shortened service life and no waterproof function, and achieve stable electrical response signal, excellent hydrophobicity, and simple operation. Effect

Active Publication Date: 2020-02-07
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The present invention aims at the problem that the current piezoresistive pressure sensor does not have the waterproof function and is easily wetted by water to shorten the service life, and pro

Method used

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  • Super-hydrophobic piezoresistive pressure sensor and preparation method thereof, and application of super-hydrophobic piezoresistive pressure sensor
  • Super-hydrophobic piezoresistive pressure sensor and preparation method thereof, and application of super-hydrophobic piezoresistive pressure sensor
  • Super-hydrophobic piezoresistive pressure sensor and preparation method thereof, and application of super-hydrophobic piezoresistive pressure sensor

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Embodiment 1

[0037] 0.25g of carboxylated carbon nanotubes were ultrasonically dispersed in 50mL of 1% acetic acid aqueous solution, and then 1g of chitosan was added under stirring. After the chitosan was completely dissolved, 0.05 g of glutaraldehyde was added dropwise, and allowed to stand at room temperature for 1 hour to cross-link to obtain a hydrogel, which was then freeze-dried for 48 hours to obtain an airgel. The airgel was immersed in 2mg / mL graphene oxide (prepared according to the modified Hummers method, Zhang L, Li HQ, Lai XJ, et al. Thiolated graphene-basedsuperhydrophobic sponges for oil-water separation. Chemical Engineering Journal, 2017, 316, 736– 743) solution (water and N,N-dimethylformamide as solvent, volume ratio 1:3) for 5 min. After taking it out, immerse it in 20mg / mL ascorbic acid solution, and reduce it at 70°C for 2h. Finally, soak it in the ethanol solution of 1wt% perfluorooctyl triethoxysilane for 12 hours, take it out and rinse it with absolute ethanol, ...

Embodiment 2

[0045] 0.33 g of carboxylated carbon nanotubes were ultrasonically dispersed in 50 mL of 1% acetic acid aqueous solution, and then 1 g of chitosan was added under stirring. After the chitosan was completely dissolved, 0.05 g of glutaraldehyde was added dropwise, left to stand at room temperature for 0.5 h to cross-link to obtain a hydrogel, and then freeze-dried for 24 h to obtain an airgel. The airgel was immersed in a 2 mg / mL graphene oxide solution (water and N,N-dimethylformamide as solvent, volume ratio 1:3) for 5 min. After taking it out, immerse it in 20mg / mL ascorbic acid solution, and reduce it at 70°C for 2h. Finally, soak it in the ethanol solution of 1wt% perfluorooctyl triethoxysilane for 18 hours, take it out and rinse it with absolute ethanol, dry it at 60°C for 12 hours, and stick electrodes on both ends to obtain superhydrophobic pressure. Resistive pressure sensor. Specifically, copper sheets are pasted on the upper and lower surfaces of the airgel with con...

Embodiment 3

[0049] 0.43g of carboxylated carbon nanotubes were ultrasonically dispersed in 50mL of 1% acetic acid aqueous solution, and then 1g of chitosan was added under stirring. After the chitosan was completely dissolved, 0.75 g of glutaraldehyde was added dropwise, left to stand at room temperature for 2 hours to cross-link to obtain a hydrogel, and then freeze-dried for 36 hours to obtain an airgel. The airgel was immersed in 2 mg / mL graphene oxide solution (water and N,N-dimethylformamide as solvent, volume ratio 2:3) for 5 min. After taking it out, immerse it in 20mg / mL ascorbic acid solution, and reduce it at 70°C for 2h. Finally, soak it in the ethanol solution of 1wt% perfluorooctyl triethoxysilane for 24 hours, take it out and rinse it with absolute ethanol, dry it at 60°C for 12 hours, and stick electrodes on both ends to obtain superhydrophobic pressure. Resistive pressure sensor. Specifically, copper sheets are pasted on the upper and lower surfaces of the airgel with co...

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Abstract

The invention discloses a super-hydrophobic piezoresistive pressure sensor and a preparation method and application thereof. The preparation method comprises the steps of: adding glutaraldehyde into an acetic acid mixed solution of carboxylated multi-walled carbon nanotubes and chitosan for crosslinking for 0.5-2 hours, and performing freeze drying for 24-48 hours to obtain aerogel; immersing theobtained aerogel into a graphene oxide solution, then immersing the aerogel into an ascorbic acid solution, and performing reducing for 1-3h at a temperature of 60-80 DEG C; and finally, immersing theaerogel into an ethanol solution of perfluorooctyltriethoxysilane for 12-24 hours, taking out the aerogel, performing drying, and pasting electrodes at two ends, so as to obtain a super-hydrophobic piezoresistive pressure sensor. The static contact angle of water drops on the surface of the piezoresistive pressure sensor is larger than 150 degrees, a stable electric response signal is shown for external pressure stimulation, the sensor still keeps hydrophobic during compression, and the piezoresistive pressure sensor can be used for human motion detection.

Description

technical field [0001] The invention relates to a piezoresistive pressure sensor, in particular to a superhydrophobic piezoresistive pressure sensor and its preparation method and application. Background technique [0002] The piezoresistive pressure sensor can convert external force into a change in resistance, thereby indirectly detecting the change in external force through electrical testing. Due to its simple fabrication process, high cost-effectiveness, and convenient signal acquisition mechanism, piezoresistive pressure sensors are widely used in electronic skin, interactive wearable devices, healthcare, intelligent robots, and other fields. [0003] Chinese invention patent application CN108328595A discloses a carbon airgel and its preparation method and pressure sensor. It is an omnidirectional compressible superelastic carbon airgel composed of amorphous carbon and graphene through a "mud brick" structure. The preparation method is to disperse sugar additives and ...

Claims

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Application Information

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IPC IPC(8): G01L1/18
CPCG01L1/18
Inventor 李红强吴菁菁曾幸荣赖学军陈中华
Owner SOUTH CHINA UNIV OF TECH
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