Capacitive ultrathin flexible stress sensor and producing method thereof

A stress sensor, capacitive technology, applied in 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, easy to break carbon nanotubes, etc. The method is simple and easy to implement, the elasticity is strong, and the effect of small residual strain

Active Publication Date: 2015-09-09
QINGDAO UNIV
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  • Abstract
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  • 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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  • Capacitive ultrathin flexible stress sensor and producing method thereof
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  • Capacitive ultrathin flexible stress sensor and producing method thereof

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Embodiment 1

[0031] A method for preparing a capacitive ultra-thin flexible stress sensor, comprising the following steps:

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

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

Embodiment 2

[0039] A method for preparing a capacitive ultra-thin flexible stress sensor, comprising the following steps:

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

[0041] 2) 1.0 g of undoped intrinsic polyaniline with a molecular weight of 120,000 and 1.29 g of camphorsulfonic acid were mixed, dissolved in 100 ml of chloroform and magnetically stirred at room temperature for 4 hours. The obtained dark green solution (doped polyaniline) is filtered, then 32 mg of polyethylene oxide (molecular weight 2,000,000) is added to the filtrate, and the solution is filtered again after magnetic stirring at room temperature for 2 hours to obtain a uniform electrospun Silk precursor liquid; spray a layer of conductive nanofiber film above the lower elastic protective film 1 prepared in...

Embodiment 3

[0047] A method for preparing a capacitive ultra-thin flexible stress sensor, comprising the following steps:

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

[0049] 2) 1.0 g of polyvinylpyrrolidone powder, 3.0 g of poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonic acid) aqueous solution (PEDOT / PSS, 2.8 wt% aqueous solution) and 2 g of Mix water and ethanol, then add 0.2 g of dimethyl sulfoxide, and stir magnetically for 5 hours at room temperature to make the solution evenly mixed, and then let it stand for 90 minutes to obtain a uniform electrospinning precursor solution; The spraying device sprays a layer of conductive nanofiber film on the lower layer of elastic protective film 1 prepared in step 1) to obtain the electrospun nanofiber conductive ...

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Abstract

The invention discloses a capacitive ultrathin flexible stress sensor and a producing method thereof. The capacitive ultrathin flexible stress sensor comprises a bottom elastic protective film, a bottom electrospun nanofiber conductive film electrode, a middle elastic insulated isolating film, a top electrospun nanofiber conductive film electrode, a top elastic protective film, and two metallic electrodes, wherein the two metallic electrodes are connected with the top electrospun nanofiber conductive film electrode and the bottom electrospun nanofiber conductive film electrode respectively. The top electrospun nanofiber conductive film electrode is a conductive nanofiber film produced through an electrostatic spinning method and deposited directionally on the top surface of the middle elastic insulated isolating film and the bottom electrospun nanofiber conductive film electrode is a conductive nanofiber membrane produced through an electrostatic spinning method and deposited directionally on the top surface of bottom elastic protective film. The stress sensor is stretchable in a large range and can be used for measuring a large stretching range. The capacitance of the stress sensor is determined by the induction area of the stretched stress sensor. The stress sensor is simple in preparation technology and has good application prospect.

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 nanocomposites are increasingly applications in electronic devices, especially stretchable devices. The flexible stress sensor has flexible characteristics, and can be attached to the surface of irregular objects or rigid objects, and can also be attached to human skin. It can be used as a wearable human health monitoring device for detection of small pressures such as pulse, heart rate, and throat sound. ; It has potential applications in areas such as human motion capture systems and perception sensors for robots. ...

Claims

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Application Information

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Patent Type & Authority Applications(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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