Mussel-like composite conductive fabric and multifunctional flexible sensor

Abstract

The invention discloses a mussel-imitated composite conductive fabric and a preparation method of a multifunctional flexible sensor, and relates to the technical field of multifunctional wearable flexible sensors, and the preparation method comprises the following steps: modifying the surface of a matrix fabric by using a dopamine hydrochloride mixed solution to prepare a polydopamine modified fabric; a conductive material is processed to the surface of a polydopamine modified fabric to prepare a composite conductive fabric, and the textile-based multifunctional flexible sensor is successfully prepared from the composite conductive fabric. The textile-based multifunctional flexible sensor prepared by the invention has strain / pressure responsiveness, relatively high sensitivity, quick response / recovery and stability, can be applied to detection of human motion and physiological indexes, and has wide application prospects in the aspects of electronic skin, human-computer interaction, disease prevention, rehabilitation training and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of multifunctional wearable flexible sensors, and in particular to a mussel-like composite conductive fabric and a multifunctional flexible sensor. Background Art

[0002] Flexible sensors have good flexibility, responsiveness, sensitivity and durability, and have broad application prospects in medical care, health monitoring, sports monitoring and human-computer interaction. As wearable smart clothing has gradually become a research hotspot, textile-based flexible sensors have received extensive attention from researchers because of their good breathability, flexibility, wearing comfort, high skin affinity, multi-dimensional scale structure, and long-term wearability.

[0003] The preparation methods of textile-based flexible sensors mainly include impregnation and coating. However, the coating method generally requires the addition of adhesives, which seriously affects the air permeability of textiles. In the impregnation method, since there is almost no force between the conductive material and the textile, it generally needs to be processed multiple times, the process is complicated, and the bonding strength of the conductive material on the fabric is poor. Studies have found that dopamine has excellent adhesion and binding force to solid materials. At the same time, dopamine is easily polymerized into polydopamine under neutral and weakly alkaline conditions. The polydopamine molecule has a structure similar to that of mussel adhesion protein. There are more catechol groups and amino functional groups on the molecular surface, which makes polydopamine strongly adsorbed on the surface of the material and has broad-spectrum adhesion. At the same time, the polydopamine molecule has strong metal adhesion and chelating ability for metal ions, so that the adhesion force generated by it and metal solids (nanoparticles and nanowires) in aqueous solution is much greater than the attraction between metal nanoparticles, nanowires and water, and metal solids (nanoparticles and nanowires) are more likely to adhere evenly to the surface of polydopamine. Therefore, in order to simplify the process and increase the amount of conductive material fixed on the surface of the textile, the present invention processes the conductive material onto the surface of the polydopamine-modified fabric to obtain a conductive fabric with good conductivity, and uses this conductive fabric to prepare a textile-based multifunctional flexible sensor, and studies the application performance of the textile-based multifunctional flexible sensor. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a method for preparing a mussel-imitation composite conductive fabric and a multifunctional flexible sensor, which solves the problems mentioned in the above background technology.

[0005] To achieve the above objectives, the present invention is implemented by the following technical scheme: a method for preparing a mussel-like composite conductive fabric and a multifunctional flexible sensor, comprising the following steps:

[0006] 1) Prepare a dopamine hydrochloride mixed solution;

[0007] 2) Using a mixed solution of dopamine hydrochloride to modify the surface of the base fabric to prepare a polydopamine modified fabric;

[0008] 3) Prepare a conductive material dispersion;

[0009] 4) Processing the conductive material onto the surface of the polydopamine modified fabric to prepare a composite conductive fabric.

[0010] Preferably, the concentration of the Tris buffer in (1) is 10-12 mM.

[0011] Preferably, the concentration of dopamine hydrochloride in (1) is 0.5-3.0 mg / mL.

[0012] Preferably, the pH value of the mixed solution in (1) is 8-9.

[0013] Preferably, the base fabric in (2) is cotton fabric, polyester, nylon, polyester / spandex, polyester / cotton fabric or polyester / nylon fabric.

[0014] Preferably, the modification time in (2) is 6-7 hours.

[0015] Preferably, the conductive material in (3) is carbon nanotube, copper nanowire, gold nanowire, silver nanowire, carbon black or graphene; and the concentration of the conductive material is 0.5-3.0 mg / mL.

[0016] Preferably, the treatment time in (4) is 28-35 min.

[0017] A method for preparing a mussel-like composite conductive fabric and a multifunctional flexible sensor, using the mussel-like composite conductive fabric;

[0018] Copper foil was used as the electrode material and 3M VHB glue was used to encapsulate the composite conductive fabric in a sandwich structure to produce a multifunctional flexible sensor.

[0019] Preferably, the strain sensor is a single-layer composite conductive fabric, and the pressure sensor is a three-layer composite conductive fabric.

[0020] Beneficial Effects

[0021] The present invention provides a mussel-like composite conductive fabric and a multifunctional flexible sensor. Compared with the prior art, the mussel-like composite conductive fabric and the multifunctional flexible sensor have the following beneficial effects: the composite conductive fabric and the multifunctional flexible sensor are prepared by treating the conductive material onto the surface of the polydopamine-modified fabric by a one-time impregnation method, and the composite conductive fabric is used to successfully prepare a textile-based multifunctional flexible sensor, simplifying the preparation process of the textile-based multifunctional flexible sensor and increasing the amount of conductive material fixed on the textile surface. The textile-based multifunctional flexible sensor prepared by the present invention has strain / pressure responsiveness, high sensitivity, fast response / recovery and stability, can be applied to the detection of human motion and physiological indicators, and has broad application prospects in electronic skin, human-computer interaction, disease prevention, rehabilitation training and the like. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a surface morphology of the composite conductive fabric prepared in Comparative Example 1 provided by the present invention;

[0023] Figure 2 Surface morphology of the composite conductive fabric prepared in Example 4 and Comparative Examples 2-6 provided by the present invention;

[0024] Figure 3 The resistivity of the surface of the composite conductive fabric prepared in Examples 1-6 provided by the present invention;

[0025] Figure 4 The strain responsiveness detection of the textile-based multifunctional flexible sensor provided in Example 7 of the present invention;

[0026] Figure 5 The pressure responsiveness test of the textile-based multifunctional flexible sensor to a 50g weight according to Example 7 of the present invention;

[0027] Figure 6 The stability detection of the textile-based multifunctional flexible sensor provided in Example 7 of the present invention;

[0028] Figure 7 The present invention provides a method for detecting physiological indicators of a human body by attaching a textile-based multifunctional flexible sensor to the neck in Example 7;

[0029] Figure 8 In Example 7 provided by the present invention, a textile-based multifunctional flexible sensor is attached to the sole to detect physiological indicators of the human body during walking. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] Example 1

[0032] 1) Prepare a dopamine hydrochloride mixed solution: add 0.5 mg / mL dopamine hydrochloride to 10 mM tris(hydroxymethylaminomethane) buffer and adjust the pH value of the mixed solution to 8;

[0033] 2) Using a dopamine hydrochloride mixed solution to modify the surface of cotton fabric to prepare a polydopamine modified fabric: adding pre-cleaned cotton fabric to the mixed solution, stirring at room temperature for 6 hours, taking it out, washing it with deionized water, and drying it to obtain a polydopamine modified fabric;

[0034] 3) Prepare a conductive material dispersion;

[0035] 4) Treating the conductive material onto the surface of the polydopamine modified fabric to prepare a composite conductive fabric: adding the polydopamine modified fabric into a 0.5 mg / mL carbon nanotube dispersion, immersing it for 28 min at room temperature, drying it, washing it with water, and drying it again to obtain a composite conductive fabric.

[0036] Example 2

[0037] 1) Prepare a dopamine hydrochloride mixed solution: add 1.0 mg / mL dopamine hydrochloride to 10 mM tris(hydroxymethylaminomethane) buffer and adjust the pH value of the mixed solution to 8;

[0038] 2) Using a dopamine hydrochloride mixed solution to modify the surface of polyester fabric to prepare a polydopamine modified fabric: adding pre-cleaned polyester fabric to the mixed solution, stirring at room temperature for 6 hours, taking it out, washing it with deionized water, and drying it to obtain a polydopamine modified fabric;

[0039] 3) Prepare a conductive material dispersion;

[0040] 4) Treating the conductive material onto the surface of the polydopamine-modified fabric to prepare a composite conductive fabric: adding the polydopamine-modified fabric to a 1.0 mg / mL copper nanowire dispersion, immersing it for 30 min at room temperature, drying it, washing it with water, and drying it again to obtain a composite conductive fabric.

[0041] Example 3

[0042] 1) Prepare a dopamine hydrochloride mixed solution: add 1.5 mg / mL dopamine hydrochloride to 10 mM tris(hydroxymethylaminomethane) buffer and adjust the pH value of the mixed solution to 8.5;

[0043] 2) Using a dopamine hydrochloride mixed solution to modify the surface of nylon fabric to prepare a polydopamine modified fabric: adding pre-cleaned nylon fabric to the mixed solution, stirring at room temperature for 6 hours, taking it out, washing it with deionized water, and drying it to obtain a polydopamine modified fabric;

[0044] 3) Prepare a conductive material dispersion;

[0045] 4) Treating the conductive material onto the surface of the polydopamine-modified fabric to prepare a composite conductive fabric: adding the polydopamine-modified fabric to a 1.5 mg / mL gold nanowire dispersion, immersing it for 30 min at room temperature, drying it, washing it with water, and drying it again to obtain a composite conductive fabric.

[0046] Example 4

[0047] 1) Prepare a mixed solution of dopamine hydrochloride: add 2.0 mg / mL dopamine hydrochloride to 10 mM tris(hydroxymethylaminomethane) buffer and adjust the pH value of the mixed solution to 8.5;

[0048] 2) Using a dopamine hydrochloride mixed solution to modify the surface of polyester / spandex fabric to prepare a polydopamine modified fabric: adding pre-cleaned polyester / spandex fabric to the mixed solution, stirring at room temperature for 6 hours, taking it out, washing it with deionized water, and drying it to obtain a polydopamine modified fabric;

[0049] 3) Prepare a conductive material dispersion;

[0050] 4) Treating the conductive material onto the surface of the polydopamine modified fabric to prepare a composite conductive fabric: adding the polydopamine modified fabric to a 1.0 mg / mL silver nanowire dispersion, immersing it for 30 min at room temperature, drying it, washing it with water, and drying it again to obtain a composite conductive fabric.

[0051] Example 5

[0052] 1) Prepare a mixed solution of dopamine hydrochloride: add 2.5 mg / mL dopamine hydrochloride to 12 mM tris(hydroxymethylaminomethane) buffer and adjust the pH value of the mixed solution to 9;

[0053] 2) Using a dopamine hydrochloride mixed solution to modify the surface of polyester / cotton fabric to prepare a polydopamine modified fabric: adding pre-cleaned polyester / cotton fabric to the mixed solution, stirring at room temperature for 7 hours, taking it out, washing it with deionized water, and drying it to obtain a polydopamine modified fabric;

[0054] 3) Prepare a conductive material dispersion;

[0055] 4) Treating the conductive material onto the surface of the polydopamine modified fabric to prepare a composite conductive fabric: adding the polydopamine modified fabric into a 2.5 mg / mL carbon black dispersion, immersing it for 30 min at room temperature, drying it, washing it with water, and drying it again to obtain a composite conductive fabric.

[0056] Example 6

[0057] 1) Prepare a dopamine hydrochloride mixed solution: add 3.0 mg / mL dopamine hydrochloride to 12 mM tris(hydroxymethylaminomethane) buffer and adjust the pH value of the mixed solution to 9;

[0058] 2) Using a dopamine hydrochloride mixed solution to modify the surface of polyester / nylon fabric to prepare a polydopamine modified fabric: adding pre-cleaned polyester / nylon fabric to the mixed solution, stirring at room temperature for 7 hours, taking it out, washing it with deionized water, and drying it to obtain a polydopamine modified fabric;

[0059] 3) Prepare a conductive material dispersion;

[0060] 4) Treating the conductive material onto the surface of the polydopamine-modified fabric to prepare a composite conductive fabric: adding the polydopamine-modified fabric into a 3.0 mg / mL graphene dispersion, immersing it for 35 min at room temperature, drying it, washing it with water, and drying it again to obtain a composite conductive fabric.

[0061] Example 7

[0062] This embodiment, based on the embodiment 4, provides a method for preparing a mussel-like composite conductive fabric and a multifunctional flexible sensor, wherein copper foil is used as an electrode material, and 3M VHB glue is used to encapsulate the composite conductive fabric in a sandwich structure, thereby preparing a multifunctional flexible sensor;

[0063] Among them, the strain sensor is a single-layer composite conductive fabric, and the pressure sensor is a three-layer composite conductive fabric.

[0064] Comparative Example 1

[0065] Compared with Example 4, the difference is that the base fabric is not subjected to the modification treatment of the conductive material; the rest remains unchanged.

[0066] Comparative Example 2

[0067] Compared with Example 4, the difference is that the fabric is modified by using 0.5 mg / mL silver nanowire dispersion; the rest remains unchanged.

[0068] Comparative Example 3

[0069] Compared with Example 4, the difference is that the fabric is modified by using 1.5 mg / mL silver nanowire dispersion; the rest remains unchanged.

[0070] Comparative Example 4

[0071] Compared with Example 4, the difference is that the fabric is modified by using 2.0 mg / mL silver nanowire dispersion; the rest remains unchanged.

[0072] Comparative Example 5

[0073] Compared with Example 4, the difference is that the fabric is modified by using 2.5 mg / mL silver nanowire dispersion; the rest remains unchanged.

[0074] Comparative Example 6

[0075] Compared with Example 4, the difference is that the fabric is modified by using 3.0 mg / mL silver nanowire dispersion; the rest remains unchanged.

[0076] Figure 1 This is the surface morphology of the composite conductive fabric prepared in Comparative Example 1.

[0077] Figure 2 Surface morphologies of composite conductive fabrics prepared in Example 4 and Comparative Examples 2-6: (a) Comparative Example 2, (b) Example 4, (c) Comparative Example 3, (d) Comparative Example 4, (e) Comparative Example 5, and (f) Comparative Example 6.

[0078] Figure 3 The resistivity of the surface of the composite conductive fabric prepared in Examples 1-6.

[0079] Figure 4 The relative resistance change of the textile-based multifunctional flexible sensor of Example 7 under different cyclic tensile strains (10%, 30%, 50%) (left), and the relative resistance change of the textile-based multifunctional flexible sensor after cyclic stretching of 10% (right).

[0080] Figure 5 This is the pressure responsiveness test of the textile-based multifunctional flexible sensor of Example 7 to a 50g weight.

[0081] Figure 6 This is the stability test of the textile-based multifunctional flexible sensor of Example 7.

[0082] Figure 7 This is Example 7, in which a textile-based multifunctional flexible sensor is attached to the neck to detect physiological indicators of the human body.

[0083] Figure 8 This is Example 7, in which the textile-based multifunctional flexible sensor is attached to the sole to detect human physiological indicators during walking.

[0084] Meanwhile, the contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0085] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0086] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for preparing a mussel-like composite conductive fabric and a multifunctional flexible sensor, characterized in that: The steps include: 1) Prepare a dopamine hydrochloride mixed solution; 2) Using a mixed solution of dopamine hydrochloride to modify the surface of the base fabric to prepare a polydopamine modified fabric; 3) Prepare a conductive material dispersion; 4) Processing the conductive material onto the surface of the polydopamine modified fabric to prepare a composite conductive fabric.

2. The method for preparing a mussel-like composite conductive fabric and a multifunctional flexible sensor according to claim 1, characterized in that: The concentration of the Tris buffer in (1) is 10-12 mM.

3. The method for preparing a mussel-like composite conductive fabric and a multifunctional flexible sensor according to claim 1, characterized in that: The concentration of dopamine hydrochloride in (1) is 0.5-3.0 mg / mL.

4. The method for preparing a mussel-like composite conductive fabric and a multifunctional flexible sensor according to claim 1, characterized in that: The pH value of the mixed solution in (1) is 8-9.

5. The method for preparing a mussel-like composite conductive fabric and a multifunctional flexible sensor according to claim 1, characterized in that: The base fabric in (2) is cotton fabric, polyester, nylon, polyester / spandex, polyester / cotton fabric or polyester / nylon fabric.

6. The method for preparing a mussel-like composite conductive fabric and a multifunctional flexible sensor according to claim 1, characterized in that: The modification time in (2) is 6-7h.

7. The method for preparing a mussel-like composite conductive fabric and a multifunctional flexible sensor according to claim 1, characterized in that: The conductive material in (3) is carbon nanotube, copper nanowire, gold nanowire, silver nanowire, carbon black or graphene; the concentration of the conductive material is 0.5-3.0 mg / mL.

8. The method for preparing a mussel-like composite conductive fabric and a multifunctional flexible sensor according to claim 1, characterized in that: The treatment time in (4) is 28-35 minutes.

9. A method for preparing a mussel-like composite conductive fabric and a multifunctional flexible sensor, characterized in that: Utilizing the mussel-like composite conductive fabric according to any one of claims 1 to 8; Copper foil was used as the electrode material and 3M VHB glue was used to encapsulate the composite conductive fabric in a sandwich structure to produce a multifunctional flexible sensor.

10. The multifunctional flexible sensor according to claim 9, characterized in that: The strain sensor is a single-layer composite conductive fabric, and the pressure sensor is a three-layer composite conductive fabric.

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