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High-sensitivity mesh graphene/elastomer strain sensor and its preparation method

A mesh graphene, strain sensor technology, applied in graphene, chemical instruments and methods, electric/magnetic solid deformation measurement and other directions, can solve the problems of high cost, low sensor sensitivity, easy structure damage, etc., to improve the service life , Widen the scope of application, high repeatability effect

Active Publication Date: 2020-02-14
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high melting point and high viscosity of polymer substances, the blending process of graphene and polymer substances is relatively difficult, the cost is high, the sensitivity of the obtained sensor is low, and there is no good means for large-scale amplification (Jeong, Y.R., et al. .Highly Stretchable and Sensitive Strain Sensors Using Fragmentized Graphene Foam.Adv.Funct.Mater.2015,25,4228-4236; Qin,Y.,et al.Lightweight,Superelastic,and Mechanically Flexible Graphene / Polyimide Nanocomposite Foamfor Strain Sensor Application.ACS Nano 2015,9,8933-8941; Yao,H.B.,etal.Flexible and Highly Pressure-Sensitive Graphene-Polyurethane Sponge Basedon Fractured Microstructure Design.Adv.Mater.2013,25,6692-6698.)
Not only that, the current flexible sensing cannot take into account the sensing response of weak vibration and large deformation, some are limited by sensitive materials, the structure used is easily damaged, and the deformation range is small, so it can only detect small deformation or vibration; A sensor that detects large strains, but the sensitivity coefficient is low when testing weak strains, making it difficult to achieve accurate detection

Method used

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  • High-sensitivity mesh graphene/elastomer strain sensor and its preparation method
  • High-sensitivity mesh graphene/elastomer strain sensor and its preparation method
  • High-sensitivity mesh graphene/elastomer strain sensor and its preparation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Step 1: disperse graphite oxide in an aqueous solution, and ultrasonicate at 40 kHz for 3 hours to obtain a graphene oxide dispersion liquid with a single-sheet dispersion concentration of 0.5 mg / mL.

[0028] Step 2: Use the absorbent cotton bandage as a template, wash it three times with deionized water and ethanol alternately, dry it in an oven at 80°C, and soak the absorbent cotton bandage in the graphene oxide dispersion while maintaining a vacuum pressure of -0.05MPa , soaked for 0.5h, took out the absorbent cotton bandage, put it in an oven at 60°C for 2h, then transferred it to an oven at 80°C, and dried it for 1h to obtain a graphene oxide-coated absorbent cotton bandage. The sample obtained above is heated at 250° C. to 310° C. for 3 hours, and then heated at 750° C. to 850° C. for 1 hour to obtain 1 nm network graphene. The network structure of graphene is as follows: figure 1 shown.

[0029] Step 3, place the graphene network obtained in step 2 on a glass sl...

Embodiment 2

[0032] Repeat embodiment 1 method, but in step one, ultrasonic power is 80kHz, and ultrasonic time is 2h, and the graphene oxide concentration that obtains is 2mg / mL; In step two, soaking time is 1h, and the graphene network thickness that obtains is 2nm; in step 3, the elastomer emulsion is styrene-butadiene rubber and natural rubber, the volume ratio is 1:1, the curing temperature is 60°C, and the curing time is 5h.

[0033] The sensitivity index Gaugefactor (GF) of the sensor is about 390 (00 ) / R 0 Δε, where R represents the resistance before deformation, R 0 Indicates the resistance after deformation, and Δε indicates the strain). When the strain is 7.5% and 50%, after repeated 50 times, the sensitivity indexes are 389 and 3576 respectively.

Embodiment 3

[0035] Repeat embodiment 1 method, but in step one, ultrasonic power is 100kHz, and ultrasonic time is 1h, and the graphene oxide concentration that obtains is 3mg / mL; In step two, soaking time is 2h, and the graphene network thickness that obtains is 3nm; in step 3, the elastomer emulsion is carboxylated nitrile rubber, the curing temperature is 80° C., and the curing time is 2 hours.

[0036] The sensitivity index Gaugefactor (GF) of the sensor is about 400 (00 ) / R 0 Δε, where R represents the resistance before deformation, R 0 Indicates the resistance after deformation, and Δε indicates the strain). When the strain is 7.5% and 50%, after repeated 50 times, the sensitivity indexes are 390 and 3600 respectively.

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Abstract

The present invention discloses a high-sensitivity netted graphene / elastomer strain sensor and a preparation method thereof. The method comprises: performing ultrasonic preparation of a graphene oxide dispersion liquid, taking an absorbent cotton plaster as a template, employing the vacuum extraction technology, tightly wrapping the graphene oxide on absorbent cotton fibers, employing the gradient temperature changing technology to prepare netted graphene, and performing compound solidification of the netted graphene and the elastomer emulsion to obtain a high-sensitivity netted graphene / elastomer strain sensor. The preparation method of high-sensitivity netted graphene / elastomer strain sensor is mild in condition, low in cost and high in repeatability, and the strain sensor has good deformation capability, is high in sensitivity, can induct tiny stress and can be used for a wearable electronic device.

Description

technical field [0001] The invention belongs to the technical field of strain sensor preparation, and relates to a high-sensitivity mesh graphene / elastomer strain sensor and a preparation method thereof. Background technique [0002] The strain sensor is a functional device based on measuring the strain generated by the force deformation of the object. Compared with the traditional strain sensor based on metal and semiconductor materials, the flexible strain sensor overcomes the shortcomings of hard materials, and has the characteristics of ultra-thin, ultra-light and flexible. , Stretchability, sensitivity and wearability, etc., while showing the advantages of good biocompatibility and continuous detection. [0003] Graphene is composed of carbon atoms with sp 2 The hybrid orbitals form a hexagonal two-dimensional single-layer sheet structure with a honeycomb lattice, which has ultra-high surface area, superior mechanical flexibility, high light transmittance, high carrier...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B7/16G01B1/00C01B32/194C01B32/184
CPCG01B1/00G01B7/18
Inventor 贾红兵张旭敏王经逸殷标尹清陈杨薛晓东乔旭温彦威
Owner NANJING UNIV OF SCI & TECH
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