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A capacitive ultra-thin flexible stress sensor and its preparation method

A stress sensor, capacitive technology, applied in the direction of instruments, measuring forces, measuring devices, etc., can solve the problems of unstable performance of the interface between the composite material and the electrolyte, unable to achieve self-support, not discussing the stretching effect, etc. The method is simple and easy to implement, flexible and cost-effective

Active Publication Date: 2017-09-26
QINGDAO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patent (application number CN200910011632.7) discloses a graphene-based flexible supercapacitor and its electrode material preparation method, which theoretically illustrates that graphene film can be used as an ideal flexible electrode material, and based on graphene film , a bendable flexible supercapacitor was obtained through modification and assembly of the electrodeposition process, but its stretching effect was not discussed
Recently, "Natural Communications" reported a graphene-based flexible supercapacitor (Nature Commun., 4:1475 (2013)), which is easy to achieve large-scale production according to the method in the text, but the prepared device must depend on the substrate, not self-supporting
Chinese patent (application number: CN201410233432.7) discloses a preparation method of a graphene / carbon nanotube composite fiber-based supercapacitor. The one-dimensional supercapacitor is more suitable for flexible micro devices, but its mechanical properties are poor
Chinese patent (application number: CN201420805725.3) discloses a supercapacitor based on graphene / carbon nanotube composite material, which solves the problem that the root of carbon nanotube is easy to break and has poor mechanical properties, but the assembly process is complicated, and the composite material and electrolyte Unstable contact surface performance

Method used

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  • A capacitive ultra-thin flexible stress sensor and its preparation method
  • A capacitive ultra-thin flexible stress sensor and its preparation method
  • A capacitive ultra-thin flexible stress sensor and its preparation method

Examples

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Embodiment 1

[0031] A method for preparing a capacitive ultra-thin flexible stress sensor is characterized in that it comprises the following steps:

[0032] 1) Cut a 50-micron thick polyurethane elastic film into three 3cm×5cm elastic films, which are used as the upper elastic protective film 5, the middle elastic insulating isolation film 3 and the lower elastic protective film 1 respectively;

[0033] 2) Add 1.5 g of polyvinylidene fluoride particles with a molecular weight of 270,000 under magnetic stirring, add 6.2 g of a mixed solution of dimethyl sulfoxide and acetone (mass ratio 1:1), and heat and stir in a constant temperature water bath at 60°C for 1 hour. 18wt% polyvinylidene fluoride solution, mix 2 g of carbon nanotube dispersant with 16.8 g of acetone, the heating temperature of the water bath is 60 ℃, magnetic stirring for 10 minutes, add 1.2 g of multi-walled carbon nanotubes, and ultrasonically stir evenly A carbon nanotube dispersion liquid is formed, and 2.2 grams of the carb...

Embodiment 2

[0039] A method for preparing a capacitive ultra-thin flexible stress sensor is characterized in that it comprises the following steps:

[0040] 1) Cut a 100-micron thick polyurethane elastic film into three 5cm×5cm elastic films, which are used as the upper elastic protective film 5, the middle elastic insulating isolation film 3 and the lower elastic protective film 1 respectively;

[0041] 2) Mix 1.0 g of undoped intrinsic polyaniline with a molecular weight of 120,000 and 1.29 g of camphorsulfonic acid, and dissolve in 100 ml of chloroform under magnetic stirring at room temperature for 4 hours. Filter the resulting dark green solution (doped polyaniline), then add 32 mg of polyethylene oxide (molecular weight 2000000) to the filtrate, stir the solution magnetically for 2 hours at room temperature, and filter the solution again to obtain a uniform electrospun Silk precursor liquid; spray a layer of conductive nanofiber film on top of the lower elastic protective film 1 prepared...

Embodiment 3

[0047] A method for preparing a capacitive ultra-thin flexible stress sensor is characterized in that it comprises the following steps:

[0048] 1) Cut the 80 micron thick polyurethane elastic film into 3 3cm×2cm elastic films, which are used as the upper elastic protective film 5, the middle elastic insulating isolation film 3 and the lower elastic protective film 1 respectively;

[0049] 2) 1.0g of polyvinylpyrrolidone powder, 3.0g of poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonic acid) aqueous solution (PEDOT / PSS, 2.8wt% aqueous solution) and 2g of no Mix water and ethanol, add 0.2 g of dimethyl sulfoxide, stir magnetically at room temperature for 5 hours to make the solution evenly mixed, and then let stand for 90 minutes to obtain a uniform electrospinning precursor; use air-guided directional in-situ electrostatic The spraying device sprays a layer of conductive nanofiber film on the lower elastic protective film 1 prepared in step 1) to obtain the bottom electrospun n...

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Abstract

The invention discloses a capacitive ultra-thin flexible stress sensor and a preparation method thereof. The stress sensor includes a lower elastic protective film, an electrospun nanofiber conductive film electrode on the bottom surface, an elastic insulating isolation film in the middle, an upper electrospun nanofiber conductive film electrode, an upper elastic protective film, and the upper electrospun nanofiber conductive film electrode and the upper elastic protective film respectively. The two metal electrodes of the electrospun nanofiber conductive film electrode on the bottom surface; the electrospun nanofiber conductive film electrode on the upper layer and the electrospun nanofiber conductive film electrode on the bottom surface are respectively directional deposited on the middle elastic insulating isolation film prepared by electrospinning Conductive nanofibrous film on the upper surface and the upper surface of the lower elastic protective film. The stress sensor can be stretched in a large range and can be used to measure a large stretch range. The capacitance of the stress sensor is determined by its stretched sensing area. The preparation process of the stress sensor is simple and has good application prospects.

Description

Technical field [0001] The invention relates to the technical field of flexible stress sensors, in particular to a capacitive ultra-thin flexible stress sensor capable of measuring a large stretching range and a preparation method thereof. Background technique [0002] Flexible conductive materials such as carbon nanotubes, metal or metal oxide nanowires, conductive polymers, especially water-soluble poly(3,4-ethylenedioxythiophene) PEDOT, graphene, and their nanocomposite materials are increasing Used in electronic devices, especially stretchable devices. The flexible stress sensor has flexible characteristics. It can be attached to the surface of irregular objects or rigid objects, as well as human skin, as a wearable human health monitoring device, such as pulse, heart rate, throat sound and other small pressure detection ; It has potential applications in fields such as human motion capture systems and robot perception sensors. [0003] Capacitive sensors can be divided into ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01L1/14
Inventor 闫旭龙云泽于桂凤贺晓晓王乐董瑞华贾宪生李金涛犹明浩
Owner QINGDAO UNIV
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