Preparation method of laser-induced graphene flexible strain-temperature two-parameter sensor

A laser-induced graphene technology, applied in the field of sensors, can solve the problems of susceptibility to the influence of dopamine, complex sensor structure and preparation process, and complex production process, to achieve excellent electrochemical characteristics, and the production process is green and pollution-free. The effect of high response volume

Pending Publication Date: 2021-02-12
HEBEI UNIV OF TECH
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Problems solved by technology

Although this method uses photolithography, what is obtained is a microfluidic channel mold, which needs to be modified with dopamine, so the structure and preparation process of the sensor are still relatively complicated, and the performance of the sensor is easily affected by dopamine, and it is only obtained In addition to the strain sensor, there are still limitations and sensitivity problems for the application in the field of biomedicine in today's society
Patent CN111599920A Flexible temperature sensor and its preparation method and application, including flexible substrate, source layer, dielectric layer and gate, the material of source layer is composite silk-based carbon nanofiber and Ag nanoparticle, although the size is small, there are It is beneficial to the temperature sensing of the cell microenvironment, but the material has a certain cost and the manufacturing process is complicated. The choice of flexible material polyimide can only be bent, not stretched, and can only measure temperature

Method used

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  • Preparation method of laser-induced graphene flexible strain-temperature two-parameter sensor
  • Preparation method of laser-induced graphene flexible strain-temperature two-parameter sensor
  • Preparation method of laser-induced graphene flexible strain-temperature two-parameter sensor

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Embodiment 1

[0044] Schematic diagram of the structure of a laser-induced graphene flexible strain-temperature dual-parameter sensor figure 1 As shown, it includes a flexible and stretchable substrate 1 , a graphene conductive layer 2 , a conductive copper foil 3 , and a wire 4 . The flexible stretchable substrate 1 is placed at the bottom of the sensor and is made of flexible stretchable material PDMS. The upper surface of the flexible stretchable substrate is closely attached to a graphene conductive layer 2, and the graphene conductive layer can be combined with the flexible stretchable substrate. Stretching and bending the base 1 at the same time, the graphene conductive layer has a width of 1.29mm and a length of 17.62mm, and the two ends of the graphene conductive layer are graphene electrodes for connecting external testing equipment; The conductive silver glue is connected to the graphene electrodes at both ends of the graphene conductive layer. The conductive silver glue is evenly...

Embodiment 2

[0061] A laser-induced graphene flexible strain-temperature dual-parameter sensor includes a flexible and stretchable substrate PDMS, a graphene conductive layer, a conductive copper foil, and a wire. The flexible and stretchable substrate is placed at the bottom of the sensor, and the flexible and stretchable graphene conductive layer is placed on the flexible and stretchable substrate for a tight fit.

[0062] The graphene conductive layer and the flexible stretchable substrate are stretched and bent at the same time. The conductive graphene has a width of 1.29mm and a length of 17.62mm. Both ends of the graphene electrodes are used to connect external testing equipment.

[0063] The copper foil is connected to the electrodes at both ends of the graphene through conductive silver glue. The conductive silver glue is evenly applied, and then the conductive copper foil is pasted on it, and placed on a heating table at 80°C for 40 minutes. After it is completely cured, solder is ...

Embodiment 3

[0068] A laser-induced graphene flexible strain-temperature dual-parameter sensor has different resistance change rates under different stretching rates, such as Figure 6As shown, the sensor responds to the resistance change rate at 5%, 10%, 15%, and 20% stretching rates respectively. Repeat stretching and releasing 7 times at each stretching rate, the stretching resistivity increases, and the release can basically be achieved. It has fully recovered, and the performance of many experiments is still good. At a stretch rate of 5%, the sensor has a 180% strain resistance change rate response; at a stretch rate of 10%, the sensor has a 750% strain resistance change rate response; at a stretch rate of 15% , the sensor has a 1200% strain resistance change rate response (the ordinate is the resistance change rate=(stretched resistance-initial resistance) / initial resistance*100%); at a stretch rate of 20%, the sensor has 1600 % of the strain resistance change rate response.

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Abstract

The invention relates to a preparation method of a laser-induced graphene flexible strain-temperature two-parameter sensor, wherein the method comprises the steps: preparing a preset pattern on a polyimide film by using laser to obtain patterned laser-induced graphene (LIG); uniformly mixing and stirring a PDMS solution according to a ratio of A to B of 10:1, standing for 30 minutes until bubblescompletely disappear, coating the prepared LIG with the PDMS, putting the coated LIG into a heating box at the temperature of 85 DEG C, heating for 120 minutes for curing, taking out after curing, melting the hydrosol with clear water to obtain a flexible material separated from a glass slide, and uncovering the PDMS to peel the LIG from the PI film; and finally, coating with conductive silver adhesive, and bonding a wire to obtain the flexible patterned graphene strain-temperature two-parameter sensor. The preparation method provided by the invention does not need a complex processing technology, is suitable for large-scale preparation and refined pattern processing, has no requirement on an operation environment, and is simple to operate. Wide application prospects are realized in the field of medical health wearable devices.

Description

technical field [0001] The invention belongs to the field of sensors, in particular to a high-sensitivity flexible wearable laser-induced graphene flexible strain-temperature dual-parameter sensor and a preparation method. Background technique [0002] As a precise device or device, a sensor can convert various non-electrical signals that are difficult to capture or measure into electrical signals that are easy to detect and display. an essential part of. In particular, flexible wearable sensors have broad application prospects in the fields of artificial intelligence, bioelectronics and medical care, and human-computer interaction. Flexible and wearable sensors with high sensitivity can be used to monitor physiological parameters such as pulse and respiration of the human body, and thus become a hot research direction in the field of healthcare. [0003] Graphene is a carbon atom with sp 2 The hybrid orbitals form a hexagonal two-dimensional carbon nanomaterial with a ho...

Claims

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Application Information

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IPC IPC(8): G01B7/16G01K7/16
CPCG01B7/18G01K7/16
Inventor 杨丽陈雪徐桂芝王宏丽姬华东郑广浩
Owner HEBEI UNIV OF TECH
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