Novel flexible mechanical sensor and preparation method thereof

A sensor and flexible technology, applied in the field of new flexible mechanical sensors, can solve the problems of increased processes, poor film flexibility and air permeability, insufficient softness, etc., and achieves the effect of good piezoelectric performance, good air permeability, and reduced processes

Inactive Publication Date: 2013-03-06
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, the film forming process uses the existing melting method or solvent evaporation method, and the obtained film has poor air permeability and insufficient softness.
In addition, in order to obtain good sensitivity, t

Method used

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  • Novel flexible mechanical sensor and preparation method thereof
  • Novel flexible mechanical sensor and preparation method thereof
  • Novel flexible mechanical sensor and preparation method thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0034] The method for preparing piezoelectric sensor of the present invention mainly comprises the following steps:

[0035] 1. Utilize organic solvent to prepare the solution to be spun of polyvinylidene fluoride or polyvinylidene fluoride-fluorinated olefin copolymer;

[0036] 2. Put the solution to be spun in an electrospinning device to stretch and polarize the solution to be spun to form a piezoelectric nanofiber film;

[0037] 3. Remove the remaining particles of the fiber film, and dry to remove the residual solvent;

[0038] 4. The processed fiber film and conductive film electrodes are assembled into a piezoelectric sensor device.

[0039] Electrospinning Technology

[0040] The method of the present invention is based on electrospinning technology, which is a novel technology for preparing nanofibers. figure 1 It is a schematic diagram of the structure of the electrospinning device, which includes:

[0041] High voltage power supply 1;

[0042] Injector 2 connec...

Embodiment approach

[0051]In the present invention, the conductive film electrode layer is preferably made of a conductive material with a flexible porous structure, which can be selected from traditional material electrodes prepared by etching techniques, including metal or metal oxide conductive films on flexible substrates, such as ITO-PET Film, etc.; carbon conductive film, including carbon conductive tape, graphene film, carbon nanotube film, etc.; conductive polymer film, including polypyrrole, polyacetylene, doped composite film, etc. According to the present invention, there is no limit to the selection of the material of the conductive film electrode layer, and those skilled in the art can select suitable materials according to specific applications, as long as it can be combined with the nanofiber film prepared by the present invention to form a piezoelectric sensor device, The thickness of the conductive film electrode layer matched with the fiber film is generally 100-1000nm.

[0052]...

Embodiment 1

[0062] Using the mixture of dimethylformamide and acetone with a mass ratio of 4:6 as a solvent, a certain amount of PVDF powder was dissolved to prepare a solution to be spun with a concentration of 12% (w / v). Put the prepared solution in the liquid storage chamber of the injector, turn on the power supply of the spinning device, set the output voltage of the high-voltage power supply to 9kV, set the advancing speed of the injector solution to 1.2mL / h, and obtain the thickness on the receiving plate after 4 hours 30-40 micron fiber film. The fiber film obtained by spinning is dried for 6-8 hours, and combined with the upper and lower layers of ITO-PET film to obtain the following figure 2 The sensor device shown has a sensitivity of 30mV / N after a calibration test.

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Abstract

The invention relates to a novel flexible mechanical sensor which consists of a nanofiber film layer and a conductive film electrode layer. The nanofiber film layer is made of piezoelectric material polyvinylidene fluoride or polyvinylidene fluoride-fluoro-olefine copolymer, and the molar weight of the polyvinylidene fluoride in the polyvinylidene fluoride-fluoro-olefine copolymer is 55-85% and is preferably 70-80%. The invention further provides a preparation method of the flexible mechanical sensor.

Description

technical field [0001] The invention relates to a novel flexible mechanical sensor, in particular to a piezoelectric sensor and a preparation method thereof. Background technique [0002] A sensor is a device or device that can sense the change information of the measured object and convert the change information into an output signal in the required form according to certain rules. The sensor converts the measured signal into other required form signals, so as to realize the perception, transmission and processing of information, which is the basic element of automatic detection and automatic control. Among them, the mechanical sensor is the most common one. The prior art provides various forms of mechanical sensors for various applications, such as resistive, capacitive, piezoelectric mechanical sensors and the like. Among them, resistive and capacitive sensors require an external power supply, which increases the complexity of device circuit design and production. Piez...

Claims

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Application Information

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IPC IPC(8): G01L1/16
Inventor 徐春叶任广义郑建明
Owner UNIV OF SCI & TECH OF CHINA
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