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Development of flexible resistance type pressure transducer capable of being applied to human body pulse detection

A resistive pressure and sensor technology, applied in sensors, applications, diagnostic recording/measurement, etc., can solve the problems of large hysteresis, poor stability, low sensitivity, etc., and achieve the effects of low cost, simple and environmentally friendly preparation method, and easy preparation process.

Inactive Publication Date: 2016-06-29
姜凯 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Zhang Ting, Suzhou Institute of Nanotechnology, Chinese Academy of Sciences reported a flexible bionic electronic skin based on flexible resistive eye sensors [Adv.Mater.2014, 26, 1336–1342]. Although these flexible resistive pressure sensors have simple process , low cost, strong anti-interference, easy to achieve small size, etc., but there are also disadvantages such as low sensitivity, poor stability, and large hysteresis

Method used

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  • Development of flexible resistance type pressure transducer capable of being applied to human body pulse detection
  • Development of flexible resistance type pressure transducer capable of being applied to human body pulse detection
  • Development of flexible resistance type pressure transducer capable of being applied to human body pulse detection

Examples

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Embodiment 1

[0020] 1. Preparation of polyvinylidene fluoride micro-nano fibers: First, 2 grams of polyvinylidene fluoride was dissolved in 4 grams of acetone and 4 grams of N-N dimethylformamide mixed solution, stirred at room temperature for 4 hours until the solution was uniform and transparent. After that, take 1 ml of the mixed solution into a 5 ml disposable plastic needle to start electrospinning. The spinning parameters are: voltage 10 kV, receiving plate distance 10 cm, spinning time 30 seconds. In order that the graphene can be completely coated on the surface of the nanofibers, the collection device used is a hollow stainless steel mesh.

[0021] 2. Preparation of graphene-coated polyvinylidene fluoride nanofibers: first, take 0.75 milliliters of graphene oxide solution and pour it into 29.25 milliliters of deionized water, after stirring for half an hour, the polyvinylidene fluoride nanofiber membrane is suspended in the above solution After stirring at room temperature for 2 ...

Embodiment 2

[0026] 1. Increase the spinning collection time of polyvinylidene fluoride micro-nano fibers to 60s;

[0027] 2. The concentration of the graphene oxide solution is increased to 2 times of the original;

[0028] 3. The thickness of the PDMS substrate is doubled;

[0029] Other experimental parameters and device manufacturing methods are the same as in Example 1, and the pressure performance of the test sensor and the ability to detect human pulse are different from those in Example 1. It is found that the longer the spinning collection time of polymer micro-nanofibers, the greater the thickness of the fiber film, or increasing the concentration of graphene oxide, the more layers of graphene deposited, which will lead to an increase in the conductivity of the device, but its The sensitivity will decrease, thereby reducing the ability to detect the human pulse; the increase in the thickness of the PDMS film will reduce the device's sensitivity to pressure deformation, thereby h...

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Abstract

The invention relates to a flexible resistance type pressure transducer which can be applied to human body pulse detection. Polymer micro-nano fibers prepared by adopting an electrospinning technique are taken as a framework, and graphene is taken as a conductive active layer and coats the outer layer of the framework, so that a sensitive layer of the transducer is formed; and then the sensitive layer is transferred onto a polydimethylsiloxane (PDMS) substrate, and finally another PDMS thin film covers a composite material for encapsulation, so that a device is formed. The device can be arbitrarily made into an n*m transducer array as required, so that the flexible resistance type pressure transducer is made. The flexible resistance type pressure transducer provided by the invention has extremely high sensitivity, extremely high response and restoration speed and stable response performance on a weak pressure and has good detectability on human body pulse.

Description

Technical field: [0001] The invention relates to the fields of flexible nanometer materials and resistive pressure sensors. In particular, it relates to a preparation method of a flexible pulse pressure sensor based on a polymer and graphene composite material. Background technique: [0002] Aging populations and the prevalence of chronic and infectious diseases challenge healthcare systems worldwide with rising costs. Commonly used complex medical monitoring equipment will not only greatly increase the cost, but may also bring a lot of inconvenience and pain to patients and doctors. For the challenges they face, researchers are actively looking for new solutions and solutions to enable patients to get rid of space and time constraints to achieve real-time health monitoring, so as to prevent problems before they happen and reduce medical costs. In recent years, with the development of flexible electronics, light, thin, flexible portable, foldable, and wearable flexible ela...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B5/02D01F6/12D06M11/74
CPCA61B5/02A61B5/6813A61B5/6824A61B2562/16D01F6/12D06M11/74
Inventor 姜凯陈照军沈国震娄正陈帅姜源孙德帅杜辉宗培杰
Owner 姜凯
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