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Preparation method of piezoresistance type linear flexibility stress sensor

A stress sensor and stress-sensitive technology, which is applied in the measurement of the property and force of piezoelectric resistance materials, etc., can solve the problems of complex manufacturing process and high cost of carbon-based flexible stress sensors, and achieve small size, low cost, and convenient use Effect

Inactive Publication Date: 2016-03-30
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these carbon-based flexible stress sensors generally have problems such as complex preparation process and high cost.

Method used

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  • Preparation method of piezoresistance type linear flexibility stress sensor
  • Preparation method of piezoresistance type linear flexibility stress sensor
  • Preparation method of piezoresistance type linear flexibility stress sensor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] ①Thin threads woven from cotton fibers with a diameter of about 1mm were cracked at 800°C for 1 hour under the protection of nitrogen to obtain linear carbon materials.

[0025] ② Cut the linear carbon material prepared in step ① into a 3cm-long line segment, and connect the two ends of the line segment to a metal copper wire with a diameter of 0.1mm with conductive silver glue as electrodes.

[0026] ③ The surface of the line segment connected with the copper wire electrode in step ② is dipped and coated with PDMS resin (Sylgard184, DowCorning), vacuum degassed, and the resin is cured to obtain a linear flexible stress sensor.

[0027] figure 1 The schematic diagram of the linear flexible stress sensor prepared for the present invention, wherein (A) indicates that the carbonized biomass line is composed of a large number of fine fibers; (B) indicates that the sensor is composed of three parts: stress-sensitive material-carbon fiber, PDMS resin and electrode . figure...

Embodiment 2

[0029] ①Thin threads woven from silk with a diameter of 0.2mm were cracked under the protection of argon at a high temperature of 700°C for 5 hours to obtain linear carbon materials.

[0030] ② Cut the linear carbon material prepared in step ① into a 0.5cm-long line segment, and connect the two ends of the line segment to a metal silver wire with a diameter of 0.1 mm as electrodes.

[0031] ③ The surface of the line segment connected with the silver wire electrode in step ② is dipped and coated with PDMS resin, vacuum degassed, and the resin is cured to obtain a linear flexible stress sensor.

[0032] The diameter of the linear carbon material prepared by the method provided by the invention is about 0.1mm, and the conductivity is 0.09Sm -1 . The prepared linear stress sensor has good flexibility and can be bent at any angle. The sensor has good response to stress changes with a sensitivity of 55MPa -1 , The service life can reach more than 1000 cycles. Sensors can be used...

Embodiment 3

[0034] ① A thin thread woven from hemp fiber with a diameter of about 5mm is cracked at a high temperature of 1000°C for 0.5 hour under the protection of helium to obtain a linear carbon material.

[0035] ② Cut the linear carbon material prepared in step ① into a 10cm-long line segment, and connect the two ends of the line segment to a metal gold wire with a diameter of 0.03 mm as electrodes.

[0036] ③ The surface of the line segment connected with the gold wire electrode in step ② is dipped and coated with PDMS resin, vacuum degassed, and the resin is cured to obtain a linear flexible stress sensor.

[0037] The diameter of the linear carbon material prepared by the method provided by the invention is about 2.5mm, and the conductivity is 1.22Sm -1 . The prepared linear stress sensor has good flexibility and can be bent at any angle. The sensor has good response to stress changes, with a sensitivity of 28MPa -1 , The service life can reach more than 1000 cycles. Sensors ...

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Abstract

The invention provides a preparation method of a linear flexibility stress sensor with high sensitivity. The preparation method comprises the steps: 1) performing 0.5-5 hours of splitting processing on a biomass line with a 0.2-5mm diameter under the vacuum or inert atmosphere protection and under the 700-1000DEG C high temperature to prepare linear stress sensitive materials; 2) dividing the linear stress sensitive materials into 0.5-10cm line segments, wherein two ends of each line segment are connected with a 0.03-0.5mm conductive electrode through conductive silver adhesives; and 3) dipping and coating the surface of each stress sensitive material line segment connected with the electrodes with polymethyl siloxane resin, and performing vacuum defoamation and resin solidification to prepare a linear flexibility stress sensor. The linear flexibility stress sensor belongs to the piezoresistance type, and is small in volume and convenient to use, that is, the sensor can be used independently and can also be used after being integrated with textile fabrics. The linear flexibility stress sensor can also be used for acquisition of data of respiration, pulse, heartbeat and throat vibration of a human body, and can effectively monitor the physiological signals related with human health.

Description

technical field [0001] The invention belongs to the technical field of sensor preparation, and relates to a preparation method of a stress sensor, more specifically, the invention relates to a preparation method of a piezoresistive linear flexible stress sensor. Background technique [0002] A flexible sensor is an artificial flexible electronic device used to realize human perception functions such as touch, smell, taste, hearing, and vision. In recent years, new attachable, wearable, portable, and foldable flexible electronic devices have developed rapidly, and wearable devices represented by smart bracelets continue to emerge. Good softness and elasticity are essential features for next-generation wearable electronic devices. This type of device has great application potential in consumer electronics, military, medical and health industries. [0003] Flexible stress sensors can realize high-sensitivity and rapid detection of small forces, and can monitor human health-re...

Claims

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Application Information

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IPC IPC(8): G01L1/18
CPCG01L1/18
Inventor 李元庆朱伟斌付绍云
Owner CHONGQING UNIV
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