High-sensitivity flexible piezoresistive transducer as well as preparation method and application thereof

A piezoresistive sensor, flexible technology, used in the application field of high-sensitivity flexible piezoresistive sensors, can solve the problems of poor diameter dispersion of nanomaterials, large diameter variation coefficient, and insufficient sensitivity, and achieve good repeatability and recovery effects , Large compression strain, high compression sensitivity

Active Publication Date: 2019-11-05
DONGHUA UNIV
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  • Abstract
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Problems solved by technology

[0004] However, the existing piezoresistive sensors use large-scale materials, most of which are above the micron scale, and a small part of them are nano-micron scale hybrid materials. The diameter dispersion of nanomaterials is not good, and the diameter variation coefficient is large, resulting in such Nanomaterial-based piezoresistive sensors have the disadvantages of low sensitivity and low frequency of use; and most of these piezoresistive sensors have high rigidity and small strain, and are not sensitive enough to test small stresses, especially the movement force of human fingers.

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  • High-sensitivity flexible piezoresistive transducer as well as preparation method and application thereof
  • High-sensitivity flexible piezoresistive transducer as well as preparation method and application thereof
  • High-sensitivity flexible piezoresistive transducer as well as preparation method and application thereof

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preparation example Construction

[0039] The invention relates to a preparation method and application of a pressure sensor based on silver nanowires. It has a sensitive piezoresistive effect and can be used to detect human hand movement and grip state data. It has great potential in the fields of medical treatment, sports, and health protection. application potential. A preparation method and application of a flexible piezoresistive sensor based on silver nanowires, characterized in that it comprises the following steps:

[0040] a. Silver nanowires were prepared by the classic polyol method, the synthesized precipitate was centrifuged and washed 5 times, and finally the precipitate was dispersed in a solvent to form a silver nanowire dispersion;

[0041] b. After the natural latex is pretreated, it is placed in the silver nano-dispersion liquid for dipping and coating process. After completion, it is taken out for drying process, and finally forms a three-dimensional conductor based on silver nanowires;

[...

Embodiment 1

[0047] Heat 20mL of ethylene glycol at 170°C for 30 minutes, add 0.4g of polyvinylpyrrolidone and 0.2g of silver nitrate after cooling, add 200μL of 0.1mol / L sodium chloride dropwise after stirring for 30 minutes, heat at 170°C for 2 hours, then add Acetone was centrifuged twice, ethanol was added and centrifuged three times, and the centrifugation time was 10 minutes each time. After centrifugation, 50 mL of ethanol solution was added to form a silver nanowire-ethanol dispersion. Such as Figure 5 It can be seen that the length and fineness of the synthesized silver nanowires are relatively uniform, naturally distributed in a network, and the diameters are all within 100nm, and the diameter variation coefficient is within 20%.

Embodiment 2

[0049] After the natural emulsion is pretreated, it is placed in the silver nano-dispersion liquid for dipping and coating process. After completion, it is taken out for drying process, and finally a three-dimensional conductor based on silver nanowires is formed. The upper and lower parts of the obtained silver nanowire three-dimensional conductor The surface is covered with an electrode layer and two wires are respectively drawn out to form a flexible piezoresistive sensor based on silver nanowires. Attach the flexible piezoresistive sensor based on silver nanowires to the finger cot, and connect the data acquisition instrument to form a sensor test system. The two wires of the sensor are respectively connected to the positive and negative ends of the data acquisition instrument. The instrument transmits the test electrical signal data, the result is as follows Image 6 Shown is the relative resistance change of the flexible piezoresistive sensor.

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Abstract

The invention discloses a preparation method and application of a high-sensitivity flexible piezoresistive transducer based on low-dimensional narrow-distributed silver nanowires. The high-sensitivityflexible piezoresistive transducer based on the low-dimensional narrow-distributed silver nanowires is mainly formed by a two-stage structure, wherein the first-stage structure is of a skeleton structure, and a three-dimensional elastic nanoporous skeleton is formed by the natural emulsion colloid; and the second-stage structure is of a sensing structure, a three-dimensional cross-linked sensingstructure is formed by filling synthesized silver nanowires with the elastic emulsion colloid, and finally electrode layers are attached to the upper surface and the lower surface of a sensing part and a wire is led out to form the flexible piezoresistive transducer based on the low-dimensional narrow-distributed silver nanowires. The transducers all coat five fingers of a glove, an object is pressed by the glove on the hand, and electrical changes are generated, so that the mechanical property of each finger is monitored in real time. The preparation method disclosed by the invention is simple in processing technology, good in compression characteristic and high in sensitivity, and can be used for detecting human hand motion and grip strength state data.

Description

technical field [0001] The invention relates to a high-sensitivity flexible piezoresistive sensor based on low-dimensional narrow-distributed silver nanowires, a preparation method of the high-sensitivity flexible piezoresistive sensor and an application of the high-sensitivity flexible piezoresistive sensor. Background technique [0002] In recent years, with the continuous advancement of science and technology, industrial design, artificial intelligence, clinical medicine, rehabilitation medicine, etc. are the fastest growing and most powerful scientific research fields in the world today. Information collection, that is, sensor technology as the source technology of information is the foundation of modern scientific development. And signs are widely used in various disciplines and fields. Flexible sensor is an electronic system that uses sensor technology combined with new material technology to imitate the protection, perception and regulation functions of human skin. T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L1/20B82Y15/00
CPCB82Y15/00G01L1/205
Inventor 杜赵群孙懿何玲娥
Owner DONGHUA UNIV
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