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Graphene/polymer nanofiber composite membrane, preparation method therefor and application of graphene/polymer nanofiber composite membrane

A nanofiber film and nanofiber technology, applied in the fields of application, nanotechnology, nanotechnology, etc., can solve the problems of poor sensing performance, low sensor sensitivity, low graphene loading, etc., to improve the bonding strength, change the resistance, The effect of good mechanical stability

Active Publication Date: 2020-05-15
INST OF FLEXIBLE ELECTRONICS TECH OF THU ZHEJIANG +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method can effectively improve the mechanical stability, flexibility and elasticity of the pressure sensor, the loading capacity of graphene is low and the sensing performance is poor.
In addition, due to the relatively simple micro-nano structure inside the material and the lack of targeted design, the sensitivity of the resulting sensor is low

Method used

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  • Graphene/polymer nanofiber composite membrane, preparation method therefor and application of graphene/polymer nanofiber composite membrane
  • Graphene/polymer nanofiber composite membrane, preparation method therefor and application of graphene/polymer nanofiber composite membrane
  • Graphene/polymer nanofiber composite membrane, preparation method therefor and application of graphene/polymer nanofiber composite membrane

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preparation example Construction

[0023] The invention provides a method for preparing a graphene / polymer nanofiber composite film, figure 1 Shown is a schematic flow chart of the preparation method, which includes the following steps: first, a graphene oxide dispersion is prepared from graphite by an improved Hummer method. Secondly, the graphene oxide dispersion is subjected to ultrasonic treatment, and different ultrasonic power and ultrasonic time are adjusted to obtain multiple graphene oxide dispersions with different graphene oxide sheet sizes. According to the order of the flakes from small to large, they are: the first graphene oxide dispersion, the second graphene oxide dispersion, ..., the Nth graphene oxide dispersion. The graphene oxide sheet size ranges from 0.2 to 5 μm. Thirdly, a polymer solution is prepared, and an electrospinning method is used to prepare a polymer nanofiber membrane from the polymer solution. Then, adjust the appropriate size and shape of the polymer nanofiber membrane obt...

Embodiment 1

[0045] Pre-oxidation: 16.8g K 2 S 2 o 8 and 16.8g P 2 o 5 Disperse in 80 mL of concentrated H at 60 °C 2 SO 4 In, slowly add 20g of graphite powder, and react at 80°C for 5h. After cooling to room temperature, it was slowly diluted with deionized water and allowed to stand to separate layers. After the supernatant was discarded, it was suction-filtered with a polytetrafluoroethylene filter membrane with a pore size of 0.22 μm, and the upper filter cake was washed with 3 L of deionized water and then dried naturally to obtain pre-oxidized graphite.

[0046] Oxidation: Disperse the pre-oxidized graphite in 460 mL of concentrated H 2 SO 4 and keep stirring in an ice-salt bath to lower the temperature to 0-3°C. Slowly add 60g KMnO with stirring 4 , and always keep the temperature below 5°C. Then the mixed reaction solution was heated to 35° C. and stirred for 2 h, diluted with 1.5 L of deionized water, then heated to 85° C. and stirred for 2.5 h. Add 1.5L deionized wat...

Embodiment 2

[0054] The steps of the pre-oxidation, oxidation, centrifugation, washing, ultrasonic treatment, and preparation of the pressure sensor in Example 2 are the same as those in Example 1. The differences are as follows:

[0055] Electrospinning: Take the thermoplastic polyurethane N,N-dimethylformamide solution with a concentration of 15% and place it in a 10mL syringe equipped with a metal needle with an outer diameter of 0.7mm. The resulting product was collected in a plate receiver. Electrospinning was performed at a voltage of 12 kV, a flow rate of 0.5 mL / h, and a receiving distance of 15 cm. In order to ensure that the polymer nanofibers are evenly collected, the motion control system of the nozzle is used to control the nozzle to reciprocate within the range of 5-10 cm, and the processing duration is 12 hours.

[0056] Suction filtration: take the obtained nanofiber membrane as filter paper and place it in a suction filtration device, pour 50mL of graphene oxide dispersio...

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Abstract

The invention provides a graphene / polymer nanofiber composite membrane with graphene content of gradient distribution and a preparation method for the graphene / polymer nanofiber composite membrane aswell as a flexible pressure sensor which contains the graphene / polymer nanofiber composite membrane and is high in pressure sensitivity and wide in detection range. In this application, electric resistance of the graphene / polymer nanofiber composite membrane is changed through changes of contact conditions among flakes of graphene in case of an external force, and thus, high-pressure-sensitivity wide-range detection is achieved.

Description

technical field [0001] The invention belongs to the technical field of pressure sensors, relates to a flexible film used for pressure sensors, in particular to a graphene / polymer nanofiber composite film with a gradient distribution of graphene content and a preparation method thereof, and a graphene / polymer nanofiber composite film comprising the graphene / polymer nanofiber A flexible pressure sensor with high pressure sensitivity and wide detection range of polymer nanofiber composite membrane. Background technique [0002] Flexible pressure sensors have been widely used in many fields such as wearable medical devices, sports monitoring, smart clothing, and smart robots. Among them, the piezoresistive pressure sensor is the most widely used due to the advantages of simple preparation, low energy consumption, and convenient signal collection. The sensing mechanism of this type of sensor is based on the change of resistivity when the device is subjected to pressure. Its stru...

Claims

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Application Information

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IPC IPC(8): A61B5/00A61B5/02A61B5/11B82Y30/00B82Y40/00G01L1/18G01L9/08
CPCA61B5/02A61B5/6802A61B5/1101A61B5/1118G01L1/18G01L9/08B82Y30/00B82Y40/00
Inventor 冯雪肖建亮陈颖
Owner INST OF FLEXIBLE ELECTRONICS TECH OF THU ZHEJIANG
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