Antioxidant flexible sensor as well as preparation method and application thereof

Abstract

The invention relates to the technical field of flexible sensors, and discloses an anti-oxidation flexible sensor and a preparation method and application thereof. The invention provides a preparation method of an anti-oxidation flexible sensor, which comprises the following steps: placing a substrate material in a mixed solution of graphene, ascorbic acid and silver nanowires, and carrying out hydrothermal treatment and drying to obtain an anti-oxidation flexible conductive material; the antioxidant flexible conductive material is stacked in multiple layers, then the two ends of the antioxidant flexible conductive material stacked in multiple layers are connected with copper foils respectively, packaging is conducted through a transparent adhesive tape, and the antioxidant flexible sensor is obtained. According to the antioxidant flexible sensor provided by the invention, the single-layer stress can reach 3.93 MPa, the sensitivity can reach 66.28 Pa <-1 >, the response time can reach 490 ms, tiny pressure changes can be accurately captured, and relatively good stability can be kept in 2000 times of cyclic pressing processes.

Description

Technical Field

[0001] The present invention relates to the technical field of flexible sensors, and in particular to an antioxidant flexible sensor and a preparation method and application thereof. Background Art

[0002] With the continuous development of science and technology, flexible sensors have become the focus of people's attention. Flexible sensors can convert physiological signals into electrical signals and have the characteristics of being light, thin, flexible, highly sensitive and highly stable. Therefore, flexible sensors are widely used in medical treatment, health monitoring, robotics, smart wearable devices and other fields.

[0003] In order to meet different application requirements, the flexible pressure sensors currently developed mainly include: piezoresistive sensors, piezoelectric sensors and piezoceramic sensors. Among these three types of sensors, piezoresistive sensors have the advantages of simple mechanism, convenient signal acquisition and simple preparation. Therefore, piezoresistive sensors have become a hot topic of research. Piezoresistive sensors are prepared by coating a conductive material on a substrate of suitable size. When external pressure is applied, the resistance of the sensor changes, causing the current to change. By detecting the change in current, the magnitude of the applied pressure can be accurately reflected.

[0004] However, traditional piezoresistive sensors have some problems: low sensitivity, long response time, etc.; moreover, commonly used substrate materials, such as polymers and cotton fibers, also have the disadvantage of insufficient mechanical properties and difficulty in meeting complex deformation requirements; in addition, a single conductive material has limited conductivity and poor stability in bonding with the substrate.

[0005] Based on this, providing an antioxidant flexible sensor with high sensitivity, fast response and excellent cycle stability has become a technical problem that needs to be urgently solved by technicians in this field. Summary of the invention

[0006] The purpose of the present invention is to provide an antioxidant flexible sensor and a preparation method and application thereof. The antioxidant flexible sensor has high sensitivity, rapid response and excellent cycle stability.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] One of the technical solutions of the present invention:

[0009] A method for preparing an antioxidant flexible sensor comprises the following steps:

[0010] 1) Cut the substrate material into a size of 5 cm×5 cm, and then wash the substrate material with deionized water;

[0011] 2) Place the substrate material after washing in step 1) into a mixed solution of graphene, ascorbic acid and silver nanowires, perform hydrothermal treatment, and dry it to obtain an antioxidant flexible conductive material;

[0012] 3) Cut the antioxidant flexible conductive material obtained in step 2) into a size of 1.5 cm × 1.0 cm, stack multiple layers, and then connect both ends of the stacked antioxidant flexible conductive material to copper foils respectively, and encapsulate with transparent tape to obtain the antioxidant flexible sensor.

[0013] Further, in step 1), the substrate material is a flat wire with an average thickness of 0.1 cm.

[0014] Further, in step 2), the concentration of graphene in the mixed solution of graphene, ascorbic acid and silver nanowires is 0 - 10 mg / mL, the concentration of ascorbic acid is 20 mg / mL, and the concentration of silver nanowires is 0 - 5 mg / mL.

[0015] Further, in step 2), the hydrothermal treatment specifically is: control the stirring speed to be 500 r / min, and perform hydrothermal treatment at 70 °C for 1 h.

[0016] Further, in step 3), the multi-layer stacking specifically is: stack 1 - 5 layers.

[0017] Further, in step 3), when connecting both ends of the stacked antioxidant flexible conductive material to copper foils respectively, control the overlapping width of the copper foils to be 0.5 cm.

[0018] The second technical solution of the present invention:

[0019] An antioxidant flexible sensor prepared by the preparation method of the above-mentioned antioxidant flexible sensor.

[0020] The third technical solution of the present invention:

[0021] The application of the above-mentioned antioxidant flexible sensor in the fields of medical treatment and sports monitoring.

[0022] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0023] The preparation method of an antioxidant flexible sensor provided by the present invention uses a flat wire as the substrate material, utilizes the porous structure and excellent mechanical properties of the flat wire, significantly improves the tensile strength and flexibility of the material, and combines the synergistic effect of graphene and silver nanowires to solve the technical problem that it is difficult to balance the mechanical properties and sensing performance in the prior art;

[0024] The single-layer stress of an antioxidant flexible sensor provided by the present invention can reach 3.93 MPa, and the sensitivity can reach 66.28 Pa -1, The response time can reach 490 ms, which can accurately capture minute pressure changes and maintain good stability during 2000 cyclic presses. Description of the Drawings

[0025] By reading the following detailed description of the preferred embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered a limitation of the present invention. Moreover, throughout the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0026] Figure 1 Stress-strain curves of the antioxidant flexible sensors and the flat wires of the substrate materials prepared in Examples 1 to 5;

[0027] Figure 2 Average tensile strength and average elongation of the antioxidant flexible sensors and the flat wires of the substrate materials prepared in Examples 1 to 5;

[0028] Figure 3 Test results of the stability and sensitivity of the antioxidant flexible sensor prepared in Example 1;

[0029] Figure 4 Test result diagram of the stability and sensitivity of the antioxidant flexible sensor prepared in Example 2;

[0030] Figure 5 Test result diagram of the stability and sensitivity of the antioxidant flexible sensor prepared in Example 3;

[0031] Figure 6 Test result diagram of the stability and sensitivity of the antioxidant flexible sensor prepared in Example 4;

[0032] Figure 7 Test result diagram of the stability of FSC / Gr10-AgNW3-3, where A is the response time and B is the cyclic stability under a pressure of 30.67 KPa. Detailed Embodiments

[0033] Now, various exemplary embodiments of the present invention will be described in detail. This detailed description should not be considered a limitation of the present invention, but rather an understanding of certain aspects, characteristics, and implementation embodiments of the present invention in more detail. It should be understood that the terms described in the present invention are only for describing specific embodiments and are not used to limit the present invention.

[0034] In addition, for the numerical ranges in the present invention, it should be understood that each intermediate value between the upper and lower limits of the range is also specifically disclosed. Intermediate values within any stated value or range of values, as well as each smaller range between any other stated value or intermediate value within the stated range, are also included in the present invention. The upper and lower limits of these smaller ranges may be independently included or excluded from the range.

[0035] Unless otherwise indicated, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. Although the present invention describes only preferred methods and materials, any methods and materials similar or equivalent to those described herein may also be used in the practice or testing of the present invention. All documents mentioned in this specification are incorporated by reference to disclose and describe the methods and / or materials related to the documents. In case of conflict with any incorporated document, the content of this specification shall prevail.

[0036] Without departing from the scope or spirit of the present invention, various modifications and variations can be made to the specific embodiments of the description of the present invention, which are obvious to those skilled in the art. Other embodiments obtained from the description of the present invention are obvious to those skilled in the art. The description and examples of the present invention are merely exemplary.

[0037] Regarding the use of "comprising", "including", "having", "containing", etc. herein, they are all open-ended terms, meaning including but not limited to.

[0038] In the following examples, a method for preparing an antioxidant flexible sensor includes the following steps:

[0039] 1) Cut the substrate material into a size of 5 cm × 5 cm, and then wash the substrate material with deionized water;

[0040] Among them, the substrate material is a flat wire (FSC) with an average thickness of 0.1 cm;

[0041] 2) Place the substrate material washed in step 1) in a mixed solution of graphene (Gr), ascorbic acid, and silver nanowires (AgNW), perform hydrothermal treatment, and dry it to obtain an antioxidant flexible conductive material;

[0042] Among them, in the mixed solution of graphene, ascorbic acid, and silver nanowires, the concentration of graphene is 0 - 10 mg / mL, the concentration of ascorbic acid is 20 mg / mL, and the concentration of silver nanowires is 0 - 5 mg / mL;

[0043] Among them, the hydrothermal treatment specifically is: control the stirring speed at 500 r / min, and perform hydrothermal treatment at 70 °C for 1 h;

[0044] 3) Cut the antioxidant flexible conductive material obtained in step 2) into a size of 1.5 cm × 1.0 cm, stack multiple layers, and then connect both ends of the stacked antioxidant flexible conductive material to copper foils respectively, and encapsulate with transparent tape to obtain the antioxidant flexible sensor;

[0045] Among them, the specific multi-layer stacking is: stacking 1 to 5 layers;

[0046] Among them, when connecting both ends of the stacked antioxidant flexible conductive material to copper foils respectively, control the overlapping width of the copper foils to be 0.5 cm.

[0047] Example 1

[0048] An antioxidant flexible sensor

[0049] 1) Cut the flat wire with an average thickness of 0.1 cm into a size of 5 cm × 5 cm, and then wash the flat wire with deionized water;

[0050] 2) Place the flat wire washed in step 1) in a mixed solution of graphene, ascorbic acid and silver nanowires, control the stirring speed to be 500 r / min, perform hydrothermal treatment at 70 °C for 1 h, and dry it to obtain the antioxidant flexible conductive material;

[0051] Among them, the concentration of graphene in the mixed solution of graphene, ascorbic acid and silver nanowires is 10 mg / mL, the concentration of ascorbic acid is 20 mg / mL, and the concentration of silver nanowires is 0 mg / mL;

[0052] 3) Cut the antioxidant flexible conductive material obtained in step 2) into a size of 1.5 cm × 1.0 cm, stack 1 to 5 layers respectively, and then control the overlapping width of the copper foils to be 0.5 cm. Connect both ends of the stacked antioxidant flexible conductive material to copper foils respectively, and encapsulate with transparent tape to obtain the antioxidant flexible sensor, denoted as FSC / Gr10-AgNW0-1, FSC / Gr10-AgNW0-2, FSC / Gr10-AgNW0-3, FSC / Gr10-AgNW0-4, FSC / Gr10-AgNW0-5.

[0053] Example 2

[0054] An antioxidant flexible sensor

[0055] 1) Cut the flat wire with an average thickness of 0.1 cm into a size of 5 cm × 5 cm, and then wash the flat wire with deionized water;

[0056] 2) Place the washed flat filaments in step 1) into a mixed solution of graphene, ascorbic acid, and silver nanowires. Control the stirring speed at 500 r / min, perform hydrothermal treatment at 70 °C for 1 h, and then dry to obtain an antioxidant flexible conductive material;

[0057] Among them, the concentration of graphene in the mixed solution of graphene, ascorbic acid, and silver nanowires is 10 mg / mL, the concentration of ascorbic acid is 20 mg / mL, and the concentration of silver nanowires is 3 mg / mL;

[0058] 3) Cut the antioxidant flexible conductive material obtained in step 2) into a size of 1.5 cm × 1.0 cm, stack 1 - 5 layers respectively, then control the overlapping width of the copper foil to be 0.5 cm, connect both ends of the multi-layer stacked antioxidant flexible conductive material to the copper foil respectively, and encapsulate with transparent tape to obtain the antioxidant flexible sensor, denoted as FSC / Gr10 - AgNW3 - 1, FSC / Gr10 - AgNW3 - 2, FSC / Gr10 - AgNW3 - 3, FSC / Gr10 - AgNW3 - 4, FSC / Gr10 - AgNW3 - 5.

[0059] Example 3

[0060] An antioxidant flexible sensor

[0061] 1) Cut the flat filaments with an average thickness of 0.1 cm into a size of 5 cm × 5 cm, and then wash the flat filaments with deionized water;

[0062] 2) Place the washed flat filaments in step 1) into a mixed solution of graphene, ascorbic acid, and silver nanowires. Control the stirring speed at 500 r / min, perform hydrothermal treatment at 70 °C for 1 h, and then dry to obtain an antioxidant flexible conductive material;

[0063] Among them, the concentration of graphene in the mixed solution of graphene, ascorbic acid, and silver nanowires is 10 mg / mL, the concentration of ascorbic acid is 20 mg / mL, and the concentration of silver nanowires is 5 mg / mL;

[0064] 3) Cut the antioxidant flexible conductive material obtained in step 2) into a size of 1.5 cm × 1.0 cm, stack 1 - 5 layers respectively, then control the overlapping width of the copper foil to be 0.5 cm, connect both ends of the multi-layer stacked antioxidant flexible conductive material to the copper foil respectively, and encapsulate with transparent tape to obtain the antioxidant flexible sensor, denoted as FSC / Gr10 - AgNW5 - 1, FSC / Gr10 - AgNW5 - 2, FSC / Gr10 - AgNW5 - 3, FSC / Gr10 - AgNW5 - 4, FSC / Gr10 - AgNW5 - 5.

[0065] Example 4

[0066] An antioxidant flexible sensor

[0067] 1) Cut the flat wire with an average thickness of 0.1 cm into a size of 5 cm × 5 cm, and then wash the flat wire with deionized water;

[0068] 2) Place the flat wire washed in step 1) in a mixed solution of graphene, ascorbic acid and silver nanowires, control the stirring speed at 500 r / min, perform hydrothermal treatment at 70 °C for 1 h, and dry it to obtain an antioxidant flexible conductive material;

[0069] Among them, the concentration of graphene in the mixed solution of graphene, ascorbic acid and silver nanowires is 5 mg / mL, the concentration of ascorbic acid is 20 mg / mL, and the concentration of silver nanowires is 5 mg / mL;

[0070] 3) Cut the antioxidant flexible conductive material obtained in step 2) into a size of 1.5 cm × 1.0 cm, stack 1 - 5 layers respectively, then control the overlapping width of the copper foil at 0.5 cm, connect the two ends of the multi-layer stacked antioxidant flexible conductive material to the copper foil respectively, and encapsulate it with transparent tape to obtain the antioxidant flexible sensor, denoted as FSC / Gr5-AgNW5-1, FSC / Gr5-AgNW5-2, FSC / Gr5-AgNW5-3, FSC / Gr5-AgNW5-4, FSC / Gr5-AgNW5-5.

[0071] The stress-strain curves of the antioxidant flexible sensors prepared in Examples 1 - 4 and the base material flat wire are as Figure 1 shown;

[0072] The average tensile strength and average elongation of the antioxidant flexible sensors prepared in Examples 1 - 4 and the base material flat wire are as Figure 2 shown;

[0073] From Figure 1 and Figure 2 it can be seen that for the antioxidant flexible sensor provided by the present invention, by treating the base material flat wire with a mixed solution of graphene, ascorbic acid and silver nanowires, the tensile strength and elongation of the finally prepared sensor are significantly improved, and it has good mechanical properties.

[0074] The test results of the stability and sensitivity of the antioxidant flexible sensor prepared in Example 1 are as Figure 3 shown;

[0075] The test results of the stability and sensitivity of the antioxidant flexible sensor prepared in Example 2 are as Figure 4 shown;

[0076] The test results of the stability and sensitivity of the antioxidant flexible sensor prepared in Example 3 are as follows Figure 5 shown;

[0077] The test results of the stability and sensitivity of the antioxidant flexible sensor prepared in Example 4 are as follows Figure 6 shown;

[0078] It can be seen from Figures 3 to 6 that although the antioxidant flexible sensor prepared in Example 1 shows good stability, its sensitivity is low; for the antioxidant flexible sensors prepared in Examples 2 to 4, by mixing Gr and AgNW, the sensitivity of the antioxidant flexible sensor is significantly improved; in addition, when the number of layers of the antioxidant flexible conductive material is 1 to 3 layers, as the number of layers increases, the sensitivity of the antioxidant flexible sensor increases, while in the antioxidant flexible sensors with 4 layers and above, obvious fluctuations occur, indicating that the more layers of the flexible sensor are not necessarily better; therefore, the current change is stable and the highest sensitivity is FSC / Gr10-AgNW3-3.

[0079] The stability test results of FSC / Gr10-AgNW3-3 are as follows Figure 7 shown, where A is the response time and B is the cyclic stability under a pressure of 30.67 KPa;

[0080] It can be seen from Figure 7 that the response time of FSC / Gr10-AgNW3-3 is 490 ms, and 2000 pressing cycles are carried out under a pressure of 30.67 KPa, showing a certain stability.

[0081] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: the specific implementation manners of the present invention can still be modified or equivalently replaced, and any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered within the protection scope of the claims of the present invention.

Claims

1. A preparation method of an antioxidant flexible sensor, characterized in that, It includes the following steps: 1) Cut the substrate material into a size of 5 cm × 5 cm, and then wash the substrate material with deionized water; 2) Place the substrate material washed in step 1) in a mixed solution of graphene, ascorbic acid and silver nanowires, perform hydrothermal treatment, and dry it to obtain an antioxidant flexible conductive material; 3) Cut the antioxidant flexible conductive material obtained in step 2) into a size of 1.5 cm × 1.0 cm, stack multiple layers, and then connect both ends of the antioxidant flexible conductive material after multi-layer stacking to copper foils respectively, and encapsulate with transparent tape to obtain the antioxidant flexible sensor.

2. The preparation method of an antioxidant flexible sensor according to claim 1, wherein In step 1), the substrate material is a flat wire with an average thickness of 0.1 cm.

3. The preparation method of an antioxidant flexible sensor according to claim 1, characterized in that, In step 2), in the mixed solution of graphene, ascorbic acid and silver nanowires, the concentration of graphene is 0-10 mg / mL, the concentration of ascorbic acid is 20 mg / mL, and the concentration of silver nanowires is 0-5 mg / mL.

4. The preparation method of an antioxidant flexible sensor according to claim 1, characterized in that, In step 2), the hydrothermal treatment specifically is: control the stirring speed at 500 r / min, and perform hydrothermal treatment at 70 °C for 1 h.

5. The preparation method of an antioxidant flexible sensor according to claim 1, characterized in that, In step 3), the multi-layer stacking specifically is: stack 1-5 layers.

6. The preparation method of an antioxidant flexible sensor according to claim 1, characterized in that, In step 3), when connecting both ends of the antioxidant flexible conductive material after multi-layer stacking to copper foils respectively, control the overlapping width of the copper foils at 0.5 cm.

7. An antioxidant flexible sensor prepared by the preparation method of the antioxidant flexible sensor according to any one of claims 1-6.

8. An application of the antioxidant flexible sensor according to claim 7 in the fields of medical treatment and sports monitoring.

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