Flexible piezoelectric fiber thin film with high output and preparation method thereof

A flexible piezoelectric and fiber film technology, applied in fiber processing, fiber chemical characteristics, electrospinning, etc., to achieve the effect of increasing the content of piezoelectric phase, increasing piezoelectric output, and easy concentration of force

Active Publication Date: 2018-08-24
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is still a lot of room for improvement in piezoelectric output power, and it is necessary to polarize the material to obtain piezoelectric properties.

Method used

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  • Flexible piezoelectric fiber thin film with high output and preparation method thereof
  • Flexible piezoelectric fiber thin film with high output and preparation method thereof
  • Flexible piezoelectric fiber thin film with high output and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Weigh 0.159g of surface-modified BT fibers in a beaker, add 3.20g of DMF and 2.13g of acetone, ultrasonically disperse for 1h to form a uniform suspension, slowly add 0.94g of dried P(VDF-TrFE ), heated and stirred at 30°C for 10h until completely dissolved. The obtained spinning solution is placed in a 5mL syringe for electrospinning, and the electrospinning device is as follows: figure 1 As shown, the setting spinning voltage is 15kV, the spinning distance is 15cm, the rotating speed of the roller is 1000rpm, the liquid pushing speed is 0.015ml / min, and a 6# needle is used. After continuous electrospinning for 4 h, the obtained film was dried in a vacuum oven at 40 ° C for 10 h to obtain a BT / P (VDF-TrFE) fiber membrane with a content of 5 vol %. The scanning electron micrograph is shown in figure 2 shown. It can be seen that the fibers obtained by electrospinning are uniform without beads, and the inorganic fibers are completely wrapped in the polymer matrix, form...

Embodiment 2

[0029] Weigh 0.318g of surface-modified BT fibers in a beaker, add 6.40g of DMF and 4.26g of acetone, ultrasonically disperse for 1 hour to form a uniform suspension, slowly add 1.88g of dried P(VDF-TrFE ), heated and stirred at 30°C for 10h until completely dissolved. The obtained spinning solution is placed in a 10mL syringe for electrospinning, and the electrospinning device is as follows: figure 1 As shown, the spinning voltage is set to be 15kV, the spinning distance is 15cm, the rotating speed of the roller is 0 and 900rpm respectively, the liquid pushing speed is 0.20ml / min, and a 7# needle is used. After continuous electrospinning for 5 h, the obtained film was dried in a vacuum oven at 40 °C for 20 h to obtain a BT / P (VDF-TrFE) fiber membrane. image 3is the infrared absorption spectrum of the BT / P (VDF-TrFE) fiber membrane when the rotating speed of the roller is 0 and 900 rpm, and the β phase content is 80.4% and 86.9%, respectively. The high rotational speed of t...

Embodiment 3

[0031] Weigh 0.191g of dopamine-modified PZT nanofibers in a beaker, add 3.20g of DMF and 2.13g of acetone, ultrasonically disperse for 1h to become a uniform suspension, add 0.94g of dried P(VDF-TrFE) , heated and stirred at 30°C for 10h until completely dissolved. The obtained spinning solution is placed in a 5mL syringe for electrospinning, and the electrospinning device is as follows: figure 1 As shown, the setting spinning voltage is 12.5kV, the spinning distance is 15cm, the rotating speed of the roller is 1500rpm, the liquid pushing speed is 0.12ml / min, and a 6# needle is used. The film obtained by continuous electrospinning for 4 hours was dried in a vacuum oven at 40°C for 10 hours to obtain a 5vol% PZT / P(VDF-TrFE) fiber film. The obtained film is carried out infrared test, the result is as follows: Figure 4 As shown, the β-phase contents of pure P(VDF-TrFE) and PZT / P(VDF-TrFE) fiber membranes were 86.9% and 91.3%, respectively. The addition of PZT as a nucleatin...

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Abstract

The invention provides flexible piezoelectric fiber thin film with high output and a preparation method thereof, and belongs to the technical field of electron composite materials and micro-nano function materials. An electrostatic spinning technology is adopted, and ceramic fibers, conductive fibers and other one-dimensional inorganic materials are taken as filler to prepare polymer-based composite film of a sleeve structure and in directional alignment. The filler core of the fiber composite thin film of the sleeve structure is barium titanate, barium strontium titanate, lead zirconate titanate and other piezoelectric ceramic fibers or silver nanofibers, multiwalled carbon nanotubes and other one-dimensional conductive fillers, and inorganic fillers are wrapped with polymer matrix fibers. The polymer matrix can be polyvinylidene fluoride, polyvinylidene fluoride-trifluoroethylene, polyvinylidene fluoride-trifluoroethylene-hexafluoropropylene and other materials. By adjusting contentand types of the filler, piezoelectric output voltage can reach 20 V, the output current can reach 250 nA. The cokmposite material has the advantages of good flexibility, high piezoelectric output, high sensitivity and light weight, and can be taken as a power supply of wearable equipment and a flexible sensor to detect human activities.

Description

technical field [0001] The invention belongs to the technical field of electronic composite materials and micro-nano functional materials, and relates to a process of electrospinning, a polymer-based sleeve structure using one-dimensional inorganic materials such as piezoelectric ceramic fibers and conductive fibers as fillers, an oriented alignment composite film and its preparation method. The composite material has the characteristics of good flexibility, high piezoelectric output, high sensitivity and light weight. Background technique [0002] Piezoelectric materials refer to crystal materials that generate voltage at both ends when subjected to an external force, and can realize mutual conversion between mechanical energy and electrical energy. Utilizing the characteristics of piezoelectric materials, it can be used to make various sensor elements and micro-nano energy devices. [0003] Barium titanate (BT) and lead zirconate titanate (PZT) are typical piezoelectric ...

Claims

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Application Information

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IPC IPC(8): D04H1/728D04H1/4318D01D5/00D01F1/10
CPCD01D5/003D01D5/0069D01D5/0076D01D5/0092D01F1/10D04H1/4318D04H1/728
Inventor 胡澎浩赵朝贤郑得昌牛津
Owner UNIV OF SCI & TECH BEIJING
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