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Self-powered flexible piezoresistive pressure sensor based on biofilm and preparation method and application thereof

A self-powered flexible, pressure sensor technology, applied in the direction of film/sheet adhesive, fluid pressure measurement by changing ohmic resistance, instruments, etc., can solve the complex preparation of the sensing layer, lack of energy supply, and non-adjustable sensitivity and other problems to achieve fast response and recovery time, reduce stickiness and hysteresis, and expand the response range

Active Publication Date: 2021-01-29
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the flexible piezoresistive pressure sensor has the following problems: (1) The sensing layer of the flexible piezoresistive pressure sensor is complicated to prepare, the required materials are expensive, pollute the environment, and are not friendly to the human body. Thin films of materials do not perform well in their pristine state, resulting in low device sensitivity
(2) In order to improve the sensitivity of the device, it is necessary to prepare a suitable microstructure, but the photolithography technology is expensive, the process is complicated, and it is not easy to prepare. Directly prepare microstructured electrodes on hard materials such as
(3) In addition, most piezoresistive pressure sensors have disadvantages such as low response sensitivity, small response range, unstable initial resistance, jumping resistance after response recovery, and non-adjustable sensitivity.
(4) At the same time, a single flexible piezoresistive pressure sensor needs an external energy supply to work, and lacks energy supply
Although the triboelectric nanogenerator can generate energy, it is not sensitive to the force response in a small range when performing pressure detection, or even unable to respond.

Method used

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  • Self-powered flexible piezoresistive pressure sensor based on biofilm and preparation method and application thereof
  • Self-powered flexible piezoresistive pressure sensor based on biofilm and preparation method and application thereof
  • Self-powered flexible piezoresistive pressure sensor based on biofilm and preparation method and application thereof

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preparation example Construction

[0048] In a second aspect, the present invention provides a method for preparing the biofilm-based self-powered flexible piezoresistive pressure sensor, comprising the steps of:

[0049] The polyimide tape was intercepted, treated with oxygen plasma, and poly(3,4-ethylenedioxythiophene)-polystyrene sulfonate (PEDOT:PSS) conductive polymer film resistance layer was spin-coated on its surface to obtain P-PI tape;

[0050] Laser marking is performed on the copper foil, and a micro-fence structure is prepared on the surface of the copper foil, and micro-cone structures are evenly distributed in the micro-fence structure;

[0051] The egg membrane is taken out from the eggshell, and the inner eggshell membrane is torn off to obtain the outer eggshell membrane;

[0052] Immerse the outer eggshell membrane in the carbon nanotube suspension and ultrasonically treat it to prepare the C-egg membrane;

[0053] Copy the surface microstructure of sandpaper on one side of the polydimethyl...

Embodiment 1

[0082] 1) Prepare P-PI tape, the specific steps are as follows:

[0083] (1-1) Take a section of PI adhesive tape, clean it with ethanol first, then clean it with deionized water, after drying, treat it with oxygen plasma, the oxygen flow rate is 20sccm, the power is 65W, and the time is 30s;

[0084](1-2) Spin-coat a layer of PEDOT:PSS solution on the treated PI tape at a speed of 400rmp, and then dry it on a hot plate at 60°C for 2 hours. After the PEDOT:PSS is dry, a P-PI tape is obtained;

[0085] 2) Preparation of copper foil with micro-barriers and evenly distributed micro-cone structures: Clean the copper foil with ethanol and deionized water and dry it for later use. Through the designed wiring method, the power is 20%, and the frequency is 5KHz. The laser with a speed of 200mm / s directly prepares the microstructure on the surface of the copper foil according to the laid lines. The field emission scanning electron microscope (FESEM) picture of the microstructure is as ...

Embodiment 2

[0103] 1) Prepare P-PI tape, the specific steps are as follows:

[0104] (1-1) Take a section of PI adhesive tape, wash it with ethanol first, then clean it with deionized water, after drying, treat it with oxygen plasma, the oxygen flow rate is 10sccm, the power is 85W, and the time is 40s;

[0105] (1-2) Spin-coat a layer of PEDOT:PSS solution on the treated PI tape at a speed of 800rmp, and then dry it on a hot plate at 80°C for 1.5h. After the PEDOT:PSS is dry, a P-PI tape is obtained. ;

[0106] 2) Preparation of copper foil with micro-barriers and evenly distributed micro-cone structures: Clean the copper foil with ethanol and deionized water and dry it for later use. Through the designed wiring method, the power is 30%, and the frequency is 15KHz. The laser with a speed of 500mm / s directly prepares the microstructure on the surface of the copper foil according to the laid lines;

[0107] 3) The preparation of C-egg membrane, the specific steps are as follows:

[0108...

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Abstract

The invention provides a self-powered flexible piezoresistive pressure sensor based on a biofilm, and a preparation method and application thereof; the self-powered flexible piezoresistive pressure sensor is of a laminated structure, and is provided with a polyimide adhesive tape layer, poly (3, 4-ethylenedioxythiophene)- polystyrene sulfonate conductive polymer film resistance layer, a copper foil, a carbon-nanotube- modified egg film, a polydimethylsiloxane film and a poly (3, 4-ethylenedioxythiophene)- polystyrene sulfonate-modified egg film sequentially from one side to other side. One surface of the copper foil is provided with a microstructure, and the microstructure is arranged towards the carbon-anotube- modified egg film; the egg film is an outer egg shell membrane; an irregular microstructure is processed on one side of the polydimethylsiloxane film, and a silver electrode is arranged on the other side of the polydimethylsiloxane film. A pressure sensor is ultrahigh in sensitivity, short in response and recovery time, wide in sensing range and capable of generating energy by itself.

Description

technical field [0001] The invention belongs to the technical field of pressure sensor preparation, and in particular relates to a biofilm-based self-powered flexible piezoresistive pressure sensor and its preparation method and application. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] Flexible pressure sensors can convert external pressure stimuli into electrical signals, realize pressure monitoring, and have a function similar to human skin tactile perception. Because of its high sensitivity, fast response time, good flexibility, wearable, stretchable, easy to carry, easy to attach to the human body, etc., it is widely used in human health detection, medical diagnosi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L1/20G01L9/02H02N1/04C09J7/25C09J7/29
CPCC09J2479/086C09J7/25C09J7/29G01L1/20G01L9/02H02N1/04
Inventor 李阳魏潇王琮蒋程鹏岳文静高嵩
Owner UNIV OF JINAN
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