MXene coated textile force-sensitive sensor and preparation method thereof
阅读说明：本技术 一种MXene涂覆纺织品力敏传感器及其制备方法 (MXene coated textile force-sensitive sensor and preparation method thereof ) 是由 侯成义 刘芮 李耀刚 王宏志 张青红 于 2019-10-11 设计创作，主要内容包括：本发明涉及一种MXene涂覆纺织品力敏传感器及其制备方法,包括柔性基底层和响应传输层；其中,所述响应传输层的材料为MXene。本发明在不同的外界压力下能够迅速表现出相应的电流响应；制备方法简单,力敏响应器件灵敏度高、成本低、强度高,且具有较好的柔性,在可穿戴智能服装领域具有非常广阔的应用前景。(The invention relates to an MXene coated textile force-sensitive sensor and a preparation method thereof, wherein the force-sensitive sensor comprises a flexible substrate layer and a response transmission layer; wherein the response transmission layer is made of MXene. The invention can quickly show corresponding current response under different external pressures; the preparation method is simple, and the force-sensitive response device is high in sensitivity, low in cost, high in strength, good in flexibility and wide in application prospect in the field of wearable intelligent clothes.)
1. An MXene coating fabrics force sensor which characterized in that: comprises a flexible substrate layer and a response transmission layer; wherein the response transmission layer is made of MXene.
2. The force sensitive sensor of claim 1, wherein: the flexible substrate layer is one of non-woven fabric, pure cotton cloth, ketone ammonia fiber cloth, pure linen cloth and bamboo fiber cloth.
3. A method for preparing an MXene coated textile force-sensitive sensor comprises the following steps:
(1) preparing MXene dispersion liquid;
(2) dipping a flexible substrate in the MXene dispersion liquid, taking out and drying to obtain an MXene coated flexible substrate material;
(3) connecting copper adhesive tapes at two ends of the MXene coated flexible substrate material, fixing with conductive silver paste, and packaging; and then connecting a working electrode at one end and connecting a counter electrode and a reference electrode at the other end to obtain the MXene coated textile force-sensitive sensor.
4. The production method according to claim 3, characterized in that: the preparation steps of the MXene dispersion liquid in the step (1) are as follows:
preparing etching solution of LiF, hydrochloric acid and ultrapure water, fully stirring, and then adding MAX phase Ti3AlC2Continuously stirring the powder for reaction, transferring the mixed solution into a centrifugal tube after etching is finished, and centrifuging for many times until the pH value of the supernatant is close to 7; and then fully dispersing the obtained precipitate in deionized water, centrifuging again to collect the black dispersion liquid on the upper layer, and finally storing the dispersion liquid at low temperature.
5. The method of claim 4, wherein: the MAX phase Ti3AlC2The mass ratio of the powder to the LiF to the hydrochloric acid to the ultrapure water is 1: 1-2.5: 11.79-28.296: 5.
6. The method of claim 4, wherein: the technological parameters of the stirring reaction are as follows: the reaction temperature is 20-30 ℃, the stirring speed is 600-800 r/min, and the stirring time is 24-29 h.
7. The method of claim 4, wherein: the speed of the multiple centrifugation is 3500-4000 r/min, and the centrifugation time is 5-10 min each time.
8. The method of claim 4, wherein: the speed of the secondary centrifugation is 3500-4000 r/min, and the centrifugation time is 5-10 min.
Technical Field
The invention belongs to the field of force-sensitive sensors, and particularly relates to an MXene coated textile force-sensitive sensor and a preparation method thereof.
Background
With the advent of intelligent wearable electronics, sensing devices can play a key role in the detection of humans and their surroundings. The flexible sensing device has the advantages of being easy to process, low in cost, light in weight and excellent in impact resistance and durability, and new possibilities are provided for creating a smart wearable system. Become of great importance in many application areas, such as medical diagnostics, motion monitoring and human-machine interfaces. The flexible sensing device is a functional material which can be attached to the surfaces of various irregular objects and has a sensing effect on the surface acting force (compression, bending, stretching, distortion and the like) of the material.
The traditional wearable equipment is a complete sensing device formed by combining an accelerometer and a gyroscope and used for detecting human behaviors more accurately, but the method has the problems of high cost, complex algorithm, complex structure and the like. Therefore, new materials with good sensing performance, excellent adhesion and processability (such as weaving and spinning) become the main direction of wearable research in the future. How to effectively, simply and inexpensively prepare the flexible force-sensitive sensing material with high conductivity, high sensitivity, multiple functions, quick response and high stability and apply the flexible force-sensitive sensing material to wearable sensing equipment is the key and difficult point of the current sensing material research.
With the rapid development of 2D materials, in addition to graphene, MXene is added as a new 2D material to a large family of 2D nanomaterial worlds. Ti3C2By stripping Ti in HF at room temperature3AlC2The powder yielded 2D nanoplatelets, which were named MXene. MXene is a 2D layered material derived from a transition metal carbide, nitride or carbonitride, including Ti3C2,Ti2C,Ta4C3TiNbC and (V)0.5Cr0.5)3C2. Sensors based on MXene have been extensively studied, MXene (Ti)3C2Tx) Force of/rGO (MX/rGO) ultralight/superelastic aerogelThe sensitive sensor has extremely high sensitivity (22.56 kPa)-1) Quick response time: (<200ms) and has good stability in 10000 cycles and captures signals below 10Pa so that adult pulses and various actions can be tested at random clearly, thus having potential applications in distinguishing fine strain and monitoring health activities.
However, for a high-performance flexible sensor, besides achieving high response and sensitivity in one device, the core technical requirement of the wearable sensor in the future, namely biocompatibility, should be met, which is very challenging for material and device design, and at the same time, the high price of the raw materials (Pt, Au, etc.) required in the assembly stage also limits the development of the flexible sensor.
Disclosure of Invention
The invention aims to solve the technical problem of providing an MXene coated textile force-sensitive sensor and a preparation method thereof.
The invention provides an MXene coated textile force-sensitive sensor, which comprises a flexible substrate layer and a response transmission layer, wherein the flexible substrate layer is arranged on the MXene coated textile force-sensitive sensor; wherein the response transmission layer is made of MXene.
The flexible substrate layer is one of non-woven fabric, pure cotton cloth, ketone ammonia fiber cloth, pure linen cloth and bamboo fiber cloth. The fabric has high strength, good adhesion capacity of MXene on the surface of the fabric, high stability, excellent skin-friendly performance of the fabric, and ventilation and comfort when contacting with a human body. MXene has high conductivity, low lithium ion diffusion barrier layer and stable long-term cycling performance. And it has advantages such as nontoxic, biocompatibility is good, adapts to the demand in wearable field.
The invention provides a preparation method of an MXene coated textile force-sensitive sensor, which comprises the following steps:
(1) preparing MXene dispersion liquid;
(2) dipping a flexible substrate in the MXene dispersion liquid, taking out and drying to obtain an MXene coated flexible substrate material;
(3) connecting copper adhesive tapes at two ends of the MXene coated flexible substrate material, fixing with conductive silver paste, and packaging; and then connecting a working electrode at one end and connecting a counter electrode and a reference electrode at the other end to obtain the MXene coated textile force-sensitive sensor.
The preparation steps of the MXene dispersion liquid in the step (1) are as follows:
preparing etching solution of LiF, hydrochloric acid and ultrapure water, fully stirring, and then adding MAX phase Ti3AlC2Continuously stirring the powder for reaction, transferring the mixed solution into a centrifugal tube after etching is finished, and centrifuging for many times until the pH value of the supernatant is close to 7; and then fully dispersing the obtained precipitate in deionized water, centrifuging again to collect the black dispersion liquid on the upper layer, and finally storing the dispersion liquid at low temperature.
The MAX phase Ti3AlC2The mass ratio of the powder to the LiF to the hydrochloric acid to the ultrapure water is 1: 1-2.5: 11.79-28.296: 5.
The method for regulating and controlling the loading amount of MXene on the surface of the fabric is to increase the concentration of MXene dispersion liquid and increase the soaking times.
The technological parameters of the stirring reaction are as follows: the reaction temperature is 20-30 ℃, the stirring speed is 600-800 r/min, and the stirring time is 24-29 h.
The speed of the multiple centrifugation is 3500-4000 r/min, and the centrifugation time is 5-10 min each time.
The speed of the secondary centrifugation is 3500-4000 r/min, and the centrifugation time is 5-10 min.
The preferable method for preparing MXene comprises the following steps: mixing MAX phase (Ti)3AlC2) Slowly adding the powder into the fully stirred LiF, hydrochloric acid and ultrapure water etching solution, and continuously stirring for 24 hours until the etching is complete, wherein the powder is of MAX phase (Ti)3AlC2) The mass ratio of the powder, LiF, hydrochloric acid and ultrapure water is 1: 1.5: 18.3924: 5. the washing was performed by multiple centrifugations at 3500r/min until the supernatant pH was close to 7. And then fully dispersing the obtained precipitate in deionized water, centrifuging at 3500r/min for 5min, and collecting the upper black liquid, namely MXene dispersion liquid.
Advantageous effects
(1) The MXene coated textile force-sensitive sensor material disclosed by the invention has good flexibility, high responsiveness and detection range, and can be applied to the field of intelligent wearability. Meanwhile, the composite material has good mechanical and electrical properties, biocompatibility and environmental friendliness.
(2) The preparation method is simple and easy to implement, has low requirements on production equipment and is low in cost.
Drawings
Fig. 1 is an XRD pattern of MXene prepared in example 1.
FIG. 2 is a schematic diagram of the fabrication of a coated textile force sensor of the present invention.
FIG. 3 is a graph of MXene adsorption per cubic centimeter for various fabrics prepared in examples 1-6;
FIG. 4 is a graph of the UV absorbance (600nm) of dispersions obtained by ultrasonic treatment after adsorption of MXene on various fabrics prepared in examples 1-6;
fig. 5 is a time current curve of the cotton based MXene coated textile force sensor prepared in example 1 under a dc bias of 0.4V.
Detailed Description
The invention will be further illustrated with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.