Self-assembled super-flexible piezoelectric sensor and preparation method and application thereof

A piezoelectric sensor, ultra-flexible technology, applied in the field of force measurement of piezoelectric devices, piezoelectric/electrostrictive/magnetostrictive devices, material selection for piezoelectric devices or electrostrictive devices, etc. , which can solve the problems of limiting the performance of piezoelectric sensors, discontinuous inorganic piezoelectric phase, and mismatch of elastic modulus, and achieve the effects of short response time, enhanced mechanical properties, and simple preparation method.

Pending Publication Date: 2022-05-10
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the existing piezoelectric sensors cannot combine excellent piezoelectric properties, mechanical properties and ultra-high flexibility that can be attached to any curved surface
Piezoelectric ceramics that require a complex high-temperature sintering process are mostly rigid, which restricts their application in the field of flexible and wearable piezoelectric sensors
Although it has been proposed that electrospinning or 3D interconnected piezoelectric ceramic foams can be used to prepare barium titanate ceramics with certain flexibility, the brittleness of barium titanate ceramic fibers cannot be avoided.
[0004] Organic piezoelectric materials, such as polyvinylidene fluoride (PVDF) and its copolymers, have excellent flexibility and biocompatibility, but their low-voltage electric coefficient limits the performance of piezoelectric sensors.
Organic-inorganic piezoelectric composites have both good piezoelectric properties and flexibility, but there is usually a serious elastic modulus mismatch problem at the organic-inorganic interface, and the inorganic piezoelectric phase is discontinuous in the matrix. Difficult to improve performance

Method used

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  • Self-assembled super-flexible piezoelectric sensor and preparation method and application thereof
  • Self-assembled super-flexible piezoelectric sensor and preparation method and application thereof
  • Self-assembled super-flexible piezoelectric sensor and preparation method and application thereof

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Effect test

preparation example Construction

[0063] A method for preparing a self-assembled ultra-flexible piezoelectric sensor, the method comprising the following steps:

[0064] The first step: under stirring, add 7.2mL oleic acid and 3.6mL oleylamine to 20mL 1-butanol to obtain a clear solution A;

[0065] The second step: under stirring, dissolve 1.045g of barium nitrate in 10mL of deionized water to obtain a clear solution B, then add solution B dropwise to solution A under stirring to obtain a uniform colloidal solution C for more than 30min, and mix the colloid Solution C is slowly poured into the Teflon lining of a hydrothermal kettle with a volume of 100mL;

[0066] Step 3: Under stirring, add 1.906g of tetrabutyl titanate to 20mL of 1-butanol to obtain solution D, and then slowly add solution D into the Teflon liner along the bottle wall;

[0067] Step 4: Under stirring, dissolve 1g of sodium hydroxide in 10mL of deionized water to obtain a clear solution E, then slowly add solution E into the Teflon lining a...

Embodiment 1

[0078] Put the sensor on the table, tap the sensor with the palm of your hand at a frequency of about 2Hz. The sensor can stably output a short-circuit current of ~10μA and an open-circuit voltage of ~75V.

[0079] Figure 5 is the sensitivity test of the ultra-flexible sensor prepared in the embodiment of the present invention. Specifically: Figure 5 (a) is the voltage sensitivity of the ultra-flexible piezoelectric sensor. Figure 5 (b) is the current sensitivity of the ultra-flexible piezoelectric sensor. Figure 5 (c) is the open-circuit voltage of the ultra-flexible piezoelectric sensor under different stresses. Figure 5 (d) is the short-circuit current of the ultra-flexible piezoelectric sensor under different stresses. From Figure 5 (a)–(b) It can be seen that the current and voltage sensitivities of the ultraflexible piezoelectric sensor are 84.24nA / N and 2.68V / N, respectively, when the external pressure F is in the low range (1–10N). From Figure 5 (c)-(d) ...

Embodiment 2

[0082]Step 1: Use your fingers to write the Chinese characters "Jiao", "Tong", "Da" and "Learning" on the sensor without BOPP tape on the surface, and simple symbols such as check marks, cross marks and Roman numerals 1-6.

[0083] Step 2: The current signal output by the sensor will change with the changes of the written characters. Repeat writing the character three times, the shape of the last two signals is almost the same as that of the previous signal (half width, spacing, etc.), but the peak value of the signal may change slightly with the force of the finger when writing each time.

[0084] Figure 7 (a)-(f) are the current output signals when the tester writes Chinese characters "Jiao", "Tong", "Da", "Learning" and symbols "×" and "√" on the sensor with fingers in the embodiment . The output current signal will vary with the written characters. Repeat writing characters three times, the last two signals are almost the same as the previous signal shape, half peak wi...

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Abstract

The invention relates to a self-assembled super-flexible piezoelectric sensor and a preparation method and application thereof. The preparation method comprises the following steps: (1) preparing a BaTiO3 precursor solution; (2) preparing a barium titanate nanocube dispersion liquid: performing hydrothermal reaction on the BaTiO3 precursor solution to obtain barium titanate nanocubes, and dispersing the barium titanate nanocubes in a dispersing agent to obtain the barium titanate nanocube dispersion liquid; (3) preparing a BaTiO3 / GFF composite material; (4) preparing a BaTiO3 / GFF-PVDF (Polyvinylidene Fluoride) composite film; and (5) wiring and packaging the BaTiO3 / GFF-PVDF composite film by using a double-sided conductive copper adhesive tape to obtain the self-assembled super-flexible piezoelectric sensor, and the flexible sensor is used for handwriting intelligent recognition or intelligent keyboards. Compared with the prior art, due to the adoption of a self-assembly technology, the device can realize excellent piezoelectric property without high-temperature sintering, and has the advantages of excellent mechanical property, capability of being attached to any curved surface and the like.

Description

technical field [0001] The invention relates to the field of piezoelectric sensors, in particular to a self-assembled ultra-flexible piezoelectric sensor and its preparation method and application. Background technique [0002] In recent years, self-powered piezoelectric sensors have attracted considerable attention in the implementation of various technologies in the Internet of Things, big data analysis, and smart cities. [0003] However, the existing piezoelectric sensors cannot combine excellent piezoelectric properties, mechanical properties, and ultra-high flexibility that can be attached to any curved surface. Piezoelectric ceramics that require complex high-temperature sintering processes are mostly rigid, which restricts their application in the field of flexible and wearable piezoelectric sensors. Although it has been proposed that electrospinning or 3D interconnected piezoelectric ceramic foams can be used to prepare barium titanate ceramics with certain flexibi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L41/22H01L41/37H01L41/18G01L1/16
CPCG01L1/16H10N30/852H10N30/01H10N30/092
Inventor 郭益平周佩汝
Owner SHANGHAI JIAO TONG UNIV
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