All-organic metal-free perovskite cement-based piezoelectric material, preparation method and application thereof

A piezoelectric material, metal-free technology, applied in the direction of material analysis, material analysis, instruments, etc. by electromagnetic means, can solve the problems of high brittleness and poor adhesion of concrete structures, achieve good flexibility, reduce the difficulty of preparation, and good interface bonding sexual effect

Pending Publication Date: 2020-09-11
HENAN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide an all-organic metal-free perovskite cement-based piezoelectric material. The composite material not only has excellent piezoelectric performance, but also has high flexibility and good compatibility with concrete materials, which solves the problem of existing cement-based piezoelectric materials. The problem of high brittleness of electrical materials and poor integration with concrete structures

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 13g of all-organic metal-free perovskite MDABCO-NH 4 I 3 (MDABCO is N-methyl-N'-diazabicyclo[2.2.2]octyl ammonium) dissolved in 100g of DMF and stirred evenly, then introduced 10g of Portland cement and stirred evenly, then poured into a disc shape, the stirring temperature Both are at 50°C, and finally placed in an aqueous solution of DMF with a mass fraction of 10% at room temperature to cure for 24 hours. After curing, the solvent is cleaned with water; then soaked in water for 3 days, taken out and dried naturally to obtain an all-organic metal-free Perovskite cement-based piezoelectric materials.

[0028] Coat the aluminum electrodes on both sides of the prepared disc all-organic metal-free perovskite cement-based piezoelectric material, and polarize it in silicone oil for 30 min at a DC voltage of 7 kV at a polarization temperature of 50°C. Coated with tin foil, aged at 50°C for 12 hours to obtain a product made of an all-organic metal-free perovskite cement-bas...

Embodiment 2

[0030] 19g of all-organic metal-free perovskite MDABCO-NH 4 I 3 (MDABCO is N-methyl-N'-diazabicyclo[2.2.2]octyl ammonium) dissolved in 100g of DMF and stirred evenly, then introduced 2g of Portland cement and stirred evenly, then poured into a disc shape, the stirring temperature Both are at 50°C, and finally placed in an aqueous solution of DMF with a mass fraction of 10% at room temperature for curing for 24 hours. , to obtain a product made of an all-organic metal-free perovskite cement-based piezoelectric material with a piezoelectric voltage constant of 75 pC / N.

Embodiment 3

[0032] After dissolving 10g PVDF in 100g DMAc and stirring evenly, introduce 15g MDABCO-NH 4 I 3 Mix well with 10g of sulfoaluminate cement and pour it into a disc shape. The stirring temperature is 65°C. Finally, put it in room temperature water for curing for 48 hours. After 7 days, it was taken out and dried naturally to obtain an all-organic metal-free perovskite cement-based piezoelectric material.

[0033] Coat silver electrodes on both sides of the prepared disc cement-based piezoelectric composite material, polarize in silicone oil for 20 min at a DC voltage of 6 kV, and the polarizing temperature is 120 ° C, wrap the polarized disc with tin foil, and set the temperature at 60 ℃ for 12 hours to obtain a product made of an all-organic metal-free perovskite cement-based piezoelectric material with a piezoelectric voltage constant of 55 pC / N.

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Abstract

The invention belongs to the technical field of functional composite materials, and particularly relates to an all-organic metal-free perovskite cement-based piezoelectric material, a preparation method and application. The composite material is prepared by dispersing organic metal-free perovskite piezoelectric crystals and cement into a PVDF-based piezoelectric material according to a certain proportion. On the one hand, the composite material is excellent in piezoelectric property, high in toughness and good in compatibility with a concrete material, and the problems that an existing cement-based piezoelectric material is high in brittleness and poor in overall bonding performance with a concrete structure are solved. And on the other hand, the composite material does not contain metal,especially lead, is little in pollution, and has excellent environmental harmony. The material can be used for preparing sensors of concrete building structures in civil engineering and traffic engineering, the prepared sensors are high in sensitivity and sensing precision, and potential safety hazards are reduced.

Description

technical field [0001] The invention belongs to the technical field of functional composite materials, and in particular relates to an all-organic metal-free perovskite cement-based piezoelectric material for civil and traffic engineering sensors and a preparation method. Background technique [0002] There are two main types of common perovskite materials, inorganic perovskite and organic-inorganic hybrid perovskite. Both types of perovskite materials contain metal elements. Although the appearance of metal elements endows perovskite materials with certain functional advantages, it also increases the difficulty of processing and preparation. In addition, certain metal elements, such as lead, can cause serious environmental problems. Therefore, people have been looking for the third category in the perovskite family - all-organic perovskite materials, because when all the metal cations in the material are replaced by molecules, the material will not only show some "magic" ...

Claims

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Application Information

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IPC IPC(8): C04B28/04C04B28/06C04B41/69G01N27/00C04B111/90
CPCC04B28/04C04B28/065C04B41/00C04B41/51C04B41/69C04B2111/00991C04B2111/90G01N27/00C04B24/2682C04B24/005
Inventor 祝瑜张召才刘仁俊李宗津
Owner HENAN POLYTECHNIC UNIV
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