CN114353657A - Preparation method of fabric-based negative resistance strain sensor - Google Patents
Preparation method of fabric-based negative resistance strain sensor Download PDFInfo
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- CN114353657A CN114353657A CN202210118374.8A CN202210118374A CN114353657A CN 114353657 A CN114353657 A CN 114353657A CN 202210118374 A CN202210118374 A CN 202210118374A CN 114353657 A CN114353657 A CN 114353657A
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Abstract
The invention provides a preparation method of a fabric-based negative resistance strain sensor, and belongs to the technical field of strain sensing materials. According to the invention, a natural dye gallnut aqueous solution is adopted to disperse the carbon nano tube, and cotton fabrics are dyed under the action of a surfactant and a mordant, so that the fabric-based negative resistance strain sensor is obtained. The strain sensor has the characteristics of wide strain range, high response sensitivity, wear resistance, washing resistance and the like, can be directly used as a fabric, can also be woven or sewn on the local part of a textile, and can be directly or indirectly attached to the skin of a human body to detect the motion, the physiological activity and the like of the human body. The preparation method has the advantages of simple process, low cost, environmental protection and the like, and is suitable for industrial large-scale production.
Description
Technical Field
The invention relates to the technical field of strain sensing materials, in particular to a preparation method of a fabric-based negative resistance strain sensor.
Background
The flexible strain sensor gradually becomes a research hotspot due to the advantages of being bendable, light and thin, wide in application range and the like, is used for monitoring and acquiring various body motions and vital sign signals, and has important application prospects in the aspects of medical treatment, motion detection, man-machine interaction and the like. Among them, the resistive strain sensor mostly uses a conductive material as a sensing component, such as a conductive polymer (polyaniline, polypyrrole, polythiophene, etc.), a carbon material (carbon black, carbon fiber, carbon nanotube, graphene, etc.), and a metal material (metal particles, metal wires, metal nanowires, etc.).
However, the conductive polymer is not resistant to stretching and bending, and the prepared strain sensor has low sensitivity and narrow strain range; when the carbon material and the metal material are used, the carbon material and the metal material are required to be prepared into a composite conductive material together with a stretchable and bendable flexible substrate, but the composite conductive material has small size and poor dispersibility, is easy to agglomerate and tangle, and influences the stability of the strain sensor. In addition, for flexible substrate materials, especially for wearable electronics, safety in contact with the human body must also be considered.
At present, chemical synthetic substances such as silicon rubber, polyurethane and other elastic polymers are basically adopted, but the problems of difficult degradation, difficult recovery of conductive materials and the like exist after the service life of the flexible strain sensor is reached. Therefore, there is a need to develop flexible strain sensors based on a naturally degradable biomass matrix.
Disclosure of Invention
The invention aims to provide a technical scheme for solving the problems of difficult dispersion of a carbon material and low bonding force of an interface of the carbon material and a flexible fabric substrate in the prior art, and particularly relates to a preparation method of a fabric-based negative resistance strain sensor.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a preparation method of a fabric-based negative resistance strain sensor, which comprises the following steps:
1) dispersing gallnut into the carbon nano tube suspension, and then sequentially adding a surfactant and a mordant to obtain a carbon nano tube-gallnut dispersed aqueous solution containing the mordant;
2) placing the cotton fabric into the dispersed aqueous solution obtained in the step 1), heating, and then continuously oscillating to obtain an impregnated cotton fabric;
3) and (3) washing and drying the impregnated cotton fabric in the step 2) to obtain the fabric-based negative resistance strain sensor.
Further, the concentration of the carbon nano tubes in the carbon nano tube suspension is 3-8 mg/mL.
Further, the mass ratio of the carbon nano tube to the gallnut is 1: 0.5-4.
Further, the surfactant comprises one or more of sodium dodecyl benzene sulfonate, sodium fatty alcohol acyl sulfate, sodium ethoxylated fatty acid methyl ester sulfonate and secondary sodium alkyl sulfonate.
Further, the mordant comprises one or more of ferric sulfate, copper sulfate and zinc sulfate.
Furthermore, the addition amount of the surfactant is 0.33-2 wt% of the carbon nanotube suspension; the addition amount of the mordant is 0.5-2 wt% of the carbon nano tube suspension.
Further, the gallnut is dispersed into the carbon nano tube suspension and then needs to be subjected to ultrasonic treatment, the power of the ultrasonic treatment is 200-400W, and the time of the ultrasonic treatment is 20-30 min.
Further, after the surfactant is added, the mixed solution needs to be subjected to centrifugal treatment, wherein the speed of the centrifugal treatment is 2000-3000 rpm, and the time of the centrifugal treatment is 5-15 min.
Further, in the step 2), the temperature is increased to 70-85 ℃, and then the vibration is continued for 1-3 hours.
Further, the drying temperature is 50-70 ℃.
The invention has the beneficial effects that:
the textile-based flexible strain sensor prepared from the gallnut modified carbon nanotube has the characteristics of simple process and low cost, and the used reagents are conventional reagents and do not need special equipment, so the textile-based flexible strain sensor has the characteristic of easy industrial implementation and the like.
According to the invention, the gallnut is added into the carbon nano tube, so that the carbon nano tube is prevented from being treated at high temperature by using common mixed acid, and the method has the characteristics of simple operation, no pollution, good dispersion effect and the like. The gallnut not only improves the dispersion state of the carbon nano tube in the aqueous solution, but also can improve the interfacial binding power on the fabric fiber by adding mordant to cause the active groups in the gallnut to generate complex reaction.
Drawings
FIG. 1 is a comparison of XRD (a), FT-IR (b), UV-Vis spectrum (c) and fluorescence spectrum (d) of Galla chinensis, carbon nanotubes, Galla chinensis and carbon nanotubes in different weight ratios in example 1;
FIG. 2 is a scanning electron microscope image of a fabric-based strain sensor according to example 1 of the present invention;
FIG. 3 is a graph of the wear (left) and wash (right) resistance of a fabric-based strain sensor of example 1 of the present invention;
FIG. 4 is a graph of relative resistance change versus strain during stretching/releasing in the x-axis direction (a) and the y-axis direction (c) for a fabric-based strain sensor according to example 1 of the present invention, and the relative resistance change in the x-axis direction (b) and the y-axis direction (d) for cyclic stretching/releasing at different strains;
fig. 5 shows a fabric-based strain sensor of embodiment 1 of the present invention monitoring the motion of different parts in real time: (a) the method comprises the following steps of (a) corresponding signals of wrist bending, (b) relative change of finger resistance under different bending angles, (c) detection of English letters written, and (d) a sensing schematic diagram of English letters written.
Detailed Description
The invention provides a preparation method of a fabric-based negative resistance strain sensor, which comprises the following steps:
1) dispersing gallnut into the carbon nano tube suspension, and then sequentially adding a surfactant and a mordant to obtain a carbon nano tube-gallnut dispersed aqueous solution containing the mordant;
2) placing the cotton fabric into the dispersed aqueous solution obtained in the step 1), heating, and then continuously oscillating to obtain an impregnated cotton fabric;
3) and (3) washing and drying the impregnated cotton fabric in the step 2) to obtain the fabric-based negative resistance strain sensor.
In the invention, the concentration of the carbon nanotubes in the carbon nanotube suspension is 3-8 mg/mL, preferably 4-7 mg/mL, and more preferably 5-6 mg/mL.
In the invention, the mass ratio of the carbon nanotube to the gallnut is 1: 0.5-4, preferably 1: 1-3, and more preferably 1: 2.
In the invention, the surfactant comprises one or more of sodium dodecyl benzene sulfonate, sodium fatty alcohol acyl sulfate, sodium ethoxylated fatty acid methyl ester sulfonate and secondary sodium alkyl sulfonate, and is preferably sodium dodecyl benzene sulfonate.
In the invention, the mordant comprises one or more of ferric sulfate, copper sulfate and zinc sulfate, and preferably ferric sulfate.
In the invention, the addition amount of the surfactant is 0.33-2 wt%, preferably 1 wt% of the carbon nanotube suspension.
In the invention, the addition amount of the mordant is 0.5-2 wt% of the carbon nanotube suspension, and preferably 1 wt%.
In the invention, gallnut is dispersed into a carbon nano tube suspension liquid and then needs ultrasonic treatment, wherein the ultrasonic treatment power is 200-400W, and the ultrasonic treatment time is 20-30 min; preferably, the power of ultrasonic treatment is 250-350W, and the time of ultrasonic treatment is 22-28 min; further preferably, the power of the ultrasonic treatment is 300W, and the time of the ultrasonic treatment is 25 min.
In the invention, after the surfactant is added, the mixed solution needs to be subjected to centrifugal treatment, wherein the speed of the centrifugal treatment is 2000-3000 rpm, and the time of the centrifugal treatment is 5-15 min; preferably, the speed of the centrifugal treatment is 2200 to 2800rpm, and the time of the centrifugal treatment is 8 to 12 min; further preferably, the speed of the centrifugation is 2500rpm, and the time of the centrifugation is 10 min.
In the invention, in the step 2), the temperature is increased to 70-85 ℃ and then the oscillation is continued for 1-3 h, preferably, the temperature is increased to 80 ℃ and then the oscillation is continued for 2 h.
In the invention, the drying temperature is 50-70 ℃, preferably 55-65 ℃, and further preferably 60 ℃.
The technical solutions provided by the present invention are described in detail below with reference to examples, but they should not be construed as limiting the scope of the present invention.
Example 1
The preparation method of the fabric-based negative resistance strain sensor comprises the following steps:
step one, adding carbon nano tubes with certain mass into 60mL of deionized water to prepare carbon nano tube suspension with the concentration of 5 mg/mL;
secondly, dispersing powdered gallnut into the carbon nanotube suspension according to the mass ratio of the carbon nanotube to the gallnut of 1: 0.5;
thirdly, performing ultrasonic treatment (300W and 30min) on the mixed solution at room temperature, then adding 1 wt% of sodium dodecyl benzene sulfonate, and uniformly stirring to assist in dispersing the carbon nanotube solution;
fourthly, centrifuging the mixed solution (2500rpm for 10min) to obtain a carbon nano tube-nutgall uniformly dispersed aqueous solution;
fifthly, adding 1 wt% of ferric sulfate as a mordant into the carbon nanotube-gallnut uniform dispersion aqueous solution;
sixthly, placing the cotton fabric with a knitted structure into the carbon nano tube-Chinese gall uniformly-dispersed aqueous solution containing the ferric sulfate mordant, heating to 80 ℃, and then continuously shaking for 2 hours;
and seventhly, cooling the cotton fabric to room temperature, washing with water, and drying in a 60 ℃ oven to obtain the fabric-based strain sensor with negative resistance change.
Example 2
The preparation method of the fabric-based negative resistance strain sensor comprises the following steps:
step one, adding carbon nano tubes with certain mass into 60mL of deionized water to prepare carbon nano tube suspension with the concentration of 5 mg/mL;
secondly, dispersing powdered gallnut into the carbon nanotube suspension according to the mass ratio of the carbon nanotube to the gallnut of 1: 1;
thirdly, performing ultrasonic treatment (200W and 30min) on the mixed solution at room temperature, then adding 1 wt% of sodium dodecyl benzene sulfonate, and uniformly stirring to assist in dispersing the carbon nanotube solution;
fourthly, centrifuging the mixed solution (2500rpm for 15min) to obtain a carbon nano tube-nutgall uniformly dispersed aqueous solution;
fifthly, adding 1 wt% of copper sulfate as a mordant into the carbon nano tube-nutgall uniformly dispersed aqueous solution;
sixthly, placing the cotton fabric with a knitted structure into the carbon nano tube-Chinese gall uniformly-dispersed aqueous solution containing the ferric sulfate mordant, heating to 85 ℃, and then continuously oscillating for 2 hours;
and seventhly, cooling the cotton fabric to room temperature, washing with water, and drying in a 60 ℃ oven to obtain the fabric-based strain sensor with negative resistance change.
Example 3
The preparation method of the fabric-based negative resistance strain sensor comprises the following steps:
step one, adding carbon nano tubes with certain mass into 60mL of deionized water to prepare carbon nano tube suspension with the concentration of 3 mg/mL;
secondly, dispersing powdered gallnut into the carbon nanotube suspension according to the mass ratio of the carbon nanotube to the gallnut of 1: 2;
thirdly, performing ultrasonic treatment (300W and 30min) on the mixed solution at room temperature, then adding 1 wt% of sodium dodecyl benzene sulfonate, and uniformly stirring to assist in dispersing the carbon nanotube solution;
fourthly, centrifuging the mixed solution (2000rpm, 10min) to obtain a carbon nano tube-nutgall uniformly dispersed aqueous solution;
fifthly, adding 1 wt% of ferric sulfate as a mordant into the carbon nanotube-gallnut uniform dispersion aqueous solution;
sixthly, placing the cotton fabric with a knitted structure into the carbon nano tube-Chinese gall uniformly-dispersed aqueous solution containing the ferric sulfate mordant, heating to 75 ℃, and then continuously oscillating for 2 hours;
and seventhly, cooling the cotton fabric to room temperature, washing with water, and drying in a 60 ℃ oven to obtain the fabric-based strain sensor with negative resistance change.
Example 4
The preparation method of the fabric-based negative resistance strain sensor comprises the following steps:
step one, adding carbon nano tubes with certain mass into 60mL of deionized water to prepare carbon nano tube suspension with the concentration of 8 mg/mL;
secondly, dispersing powdered gallnut into the carbon nanotube suspension according to the mass ratio of the carbon nanotube to the gallnut of 1: 3;
thirdly, performing ultrasonic treatment on the mixed solution at room temperature (250W for 30min), adding 1 wt% of sodium dodecyl benzene sulfonate, and uniformly stirring to assist in dispersing the carbon nanotube solution;
fourthly, centrifuging the mixed solution (2500rpm for 15min) to obtain a carbon nano tube-nutgall uniformly dispersed aqueous solution;
fifthly, adding 1 wt% of zinc sulfate as a mordant into the carbon nanotube-gallnut uniformly dispersed aqueous solution;
sixthly, placing the cotton fabric with a knitted structure into the carbon nano tube-Chinese gall uniformly-dispersed aqueous solution containing the ferric sulfate mordant, heating to 80 ℃, and then continuously shaking for 1 h;
and seventhly, cooling the cotton fabric to room temperature, washing with water, and drying in a 60 ℃ oven to obtain the fabric-based strain sensor with negative resistance change.
Example 5
The preparation method of the fabric-based negative resistance strain sensor comprises the following steps:
step one, adding carbon nano tubes with certain mass into 60mL of deionized water to prepare carbon nano tube suspension with the concentration of 5 mg/mL;
secondly, dispersing powdered gallnut into the carbon nanotube suspension according to the mass ratio of the carbon nanotube to the gallnut of 1: 4;
thirdly, performing ultrasonic treatment on the mixed solution at room temperature (280W for 20min), adding 1 wt% of sodium dodecyl benzene sulfonate, and uniformly stirring to assist in dispersing the carbon nanotube solution;
fourthly, centrifuging the mixed solution (2500rpm for 10min) to obtain a carbon nano tube-nutgall uniformly dispersed aqueous solution;
fifthly, adding 1 wt% of ferric sulfate as a mordant into the carbon nanotube-gallnut uniform dispersion aqueous solution;
sixthly, placing the cotton fabric with a knitted structure into the carbon nano tube-Chinese gall uniformly-dispersed aqueous solution containing the ferric sulfate mordant, heating to 82 ℃, and then continuously oscillating for 2 hours;
and seventhly, cooling the cotton fabric to room temperature, washing with water, and drying in a 60 ℃ oven to obtain the fabric-based strain sensor with negative resistance change.
From the above embodiments, the present invention provides a method for manufacturing a fabric-based negative resistance strain sensor. The gallnut modified carbon nano tube obtained by the invention is dispersed in water, and after being placed for 30 days, the solution presents uniform black, the dispersion effect is excellent, the stability is good, the process is easy to control, and the gallnut modified carbon nano tube is non-toxic and pollution-free. The prepared fabric-based strain sensor has the advantages of good wear resistance, washing resistance and the like.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A preparation method of a fabric-based negative resistance strain sensor is characterized by comprising the following steps:
1) dispersing gallnut into the carbon nano tube suspension, and then sequentially adding a surfactant and a mordant to obtain a carbon nano tube-gallnut dispersed aqueous solution containing the mordant;
2) placing the cotton fabric into the dispersed aqueous solution obtained in the step 1), heating, and then continuously oscillating to obtain an impregnated cotton fabric;
3) and (3) washing and drying the impregnated cotton fabric in the step 2) to obtain the fabric-based negative resistance strain sensor.
2. The method for preparing the fabric-based negative resistance strain sensor according to claim 1, wherein the concentration of the carbon nanotubes in the carbon nanotube suspension is 3-8 mg/mL.
3. The preparation method of the fabric-based negative resistance strain sensor according to claim 1 or 2, wherein the mass ratio of the carbon nanotubes to the gallnuts is 1: 0.5-4.
4. The method for preparing the fabric-based negative resistance strain sensor according to claim 3, wherein the surfactant comprises one or more of sodium dodecyl benzene sulfonate, sodium fatty alcohol acyl sulfate, sodium ethoxylated fatty acid methyl ester sulfonate and secondary sodium alkyl sulfonate.
5. The method for preparing the fabric-based negative resistance strain sensor according to claim 1, 2 or 4, wherein the mordant comprises one or more of ferric sulfate, copper sulfate and zinc sulfate.
6. The method for preparing the fabric-based negative resistance strain sensor according to claim 5, wherein the surfactant is added in an amount of 0.33-2 wt% of the carbon nanotube suspension; the addition amount of the mordant is 0.5-2 wt% of the carbon nano tube suspension.
7. The preparation method of the fabric-based negative resistance strain sensor according to claim 1 or 6, wherein ultrasonic treatment is required after the gallnut is dispersed in the carbon nanotube suspension, the power of the ultrasonic treatment is 200-400W, and the time of the ultrasonic treatment is 20-30 min.
8. The method for preparing the fabric-based negative resistance strain sensor according to claim 7, wherein the mixed solution is centrifuged after the surfactant is added, the speed of the centrifugation is 2000-3000 rpm, and the time of the centrifugation is 5-15 min.
9. The method for preparing the fabric-based negative resistance strain sensor according to claim 6 or 8, wherein in the step 2), the temperature is raised to 70-85 ℃ and then the oscillation is continued for 1-3 h.
10. The method for preparing the fabric-based negative resistance strain sensor according to claim 9, wherein the drying temperature is 50-70 ℃.
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Citations (5)
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| JP2006292478A (en) * | 2005-04-07 | 2006-10-26 | Matsushita Electric Works Ltd | Physical quantity sensor |
| JP2014025180A (en) * | 2012-07-27 | 2014-02-06 | Yamaha Corp | Fabric and clothing with distortion sensor |
| CN112376274A (en) * | 2020-11-05 | 2021-02-19 | 武汉纺织大学 | Strain sensing fabric and preparation method thereof |
| CN112479185A (en) * | 2020-12-03 | 2021-03-12 | 安徽大学 | Polyurethane-tannin-stabilized carbon nanotube aqueous dispersion and preparation method thereof |
| CN112556899A (en) * | 2020-12-09 | 2021-03-26 | 武汉纺织大学 | Flexible pressure sensor and preparation method thereof |
-
2022
- 2022-02-08 CN CN202210118374.8A patent/CN114353657B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006292478A (en) * | 2005-04-07 | 2006-10-26 | Matsushita Electric Works Ltd | Physical quantity sensor |
| JP2014025180A (en) * | 2012-07-27 | 2014-02-06 | Yamaha Corp | Fabric and clothing with distortion sensor |
| CN112376274A (en) * | 2020-11-05 | 2021-02-19 | 武汉纺织大学 | Strain sensing fabric and preparation method thereof |
| CN112479185A (en) * | 2020-12-03 | 2021-03-12 | 安徽大学 | Polyurethane-tannin-stabilized carbon nanotube aqueous dispersion and preparation method thereof |
| CN112556899A (en) * | 2020-12-09 | 2021-03-26 | 武汉纺织大学 | Flexible pressure sensor and preparation method thereof |
Non-Patent Citations (5)
| Title |
|---|
| BAOWEI HAO等: "《In situ polymerization of pyrrole on CNT/cotton multifunctional composite yarn for supercapacitors》", 《IONICS》 * |
| GUANGMING CAI等: "《Highly Stretchable Sheath−Core Yarns for Multifunctional Wearable Electronics》", 《ACS APPLIED MATERIALS & INTERFACES》 * |
| XIAONING TANG等: "《Recent advances on the fabrication methods of nanocomposite yarn-based strain sensor》", 《NANOTECHNOLOGY》 * |
| 姜伟冬: "《生物大分子分散碳纳米管及其多功能应变传感织物》", 《中国优秀硕士学位论文全文数据库 工程科技Ⅱ辑》, pages 27 - 39 * |
| 毕曙光等: "《基于长银纳米线的柔性应变传感器制备》", 《天津工业大学学报》 * |
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