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Preparation method of nanocellulose/molybdenum disulfide piezoelectric composite film

A technology of nano-cellulose and molybdenum disulfide, applied in the field of materials, can solve the problems of inability to improve the piezoelectric properties of cellulose, poor piezoelectric properties of cellulose, and great differences in piezoelectric properties, achieve high crystallinity, and prevent agglomeration , The effect of superior piezoelectric performance

Pending Publication Date: 2021-04-13
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Piezoelectric ceramics have the advantage of large piezoelectric effect, but their use is limited due to the difficulty in forming and processing
Piezoelectric polymer PVDF is easy to form and has good flexibility, but its piezoelectric performance is far from that of piezoelectric ceramics, and it has toxic fluorine involved in its processing and synthesis, which has certain pollution to the environment
Biomass material cellulose has the characteristics of green and pollution-free, good biocompatibility, abundant sources, and easy processing. It can be used in energy harvesting devices and sensor devices, but the piezoelectric properties of natural wood and cellulose are poor. Cellulose is used as a piezoelectric material in electronic devices, and its piezoelectric properties must be enhanced
Polarization, increasing directional dipoles and adding high-voltage fillers are effective methods to strengthen cellulose-based piezoelectric materials. However, due to the nature of cellulose itself, polarization and increasing directional dipoles cannot affect the piezoelectricity of cellulose. qualitatively improved performance

Method used

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  • Preparation method of nanocellulose/molybdenum disulfide piezoelectric composite film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The preparation of nanocellulose / molybdenum disulfide piezoelectric composite film, its steps are as follows:

[0032] 1) Disperse 2.447g of cellulose nanofibers with a water content of 81wt% in 150mL of deionized water, stir with a magnetic stirrer for 30min, then use a cell disruptor to sonicate for 6min, and finally centrifuge at 8500rpm to remove undispersed precipitates to obtain 0.3wt% The prepared nanocellulose dispersion is stored at a temperature lower than 5°C.

[0033] 2) Preparation of molybdenum disulfide nanosheets: 0.6 g of molybdenum disulfide powder and 60 mL of triethanolamine were placed in a 100 mL single-necked flask. Stir at room temperature with a mechanical stirrer (rotating at 1000rpm) for 8h, centrifuge the mixed dispersion obtained at 4500rpm for 30min to get the supernatant, and stir and blend the supernatant with deionized water. Vacuum filtration on the filter membrane, repeated washing three times. The product obtained by the last suctio...

Embodiment 2

[0038] The preparation of nanocellulose / molybdenum disulfide piezoelectric composite film, its steps are as follows:

[0039] 1) Disperse 2.447g of cellulose nanofibers with a water content of 81wt% in 150mL of deionized water, stir with a magnetic stirrer for 30min, then use a cell disruptor to sonicate for 6min, and finally centrifuge at 8500rpm to remove undispersed precipitates to obtain 0.3wt% The prepared nanocellulose dispersion is stored at a temperature lower than 5°C.

[0040] 2) Preparation of molybdenum disulfide nanosheets: 0.6 g of molybdenum disulfide powder and 60 mL of triethanolamine were placed in a 100 mL single-necked flask. Stir at room temperature with a mechanical stirrer (rotating at 1000rpm) for 8h, centrifuge the mixed dispersion obtained at 4500rpm for 30min to get the supernatant, and stir and blend the supernatant with deionized water. Vacuum filtration on the filter membrane, repeated washing three times. The product obtained by the last suctio...

Embodiment 3

[0044] The preparation of nanocellulose / molybdenum disulfide piezoelectric composite film, its steps are as follows:

[0045]1) Preparation of nanocellulose dispersion: Disperse 2.447g of cellulose nanofibers with a water content of 81wt% into 150mL of deionized water, stir for 30min with a magnetic stirrer, then sonicate for 6min with a cell disruptor, and finally centrifuge at 8500rpm to remove untreated cellulose. Disperse the precipitate to obtain a 0.3wt% nanocellulose aqueous dispersion, and store the prepared nanocellulose dispersion at a temperature lower than 5°C.

[0046] 2) Preparation of molybdenum disulfide nanosheets: 3 g of molybdenum disulfide powder, 60 g of urea and 278 g of glycerin were placed in a 250 mL three-neck flask. Stir at room temperature with a mechanical stirrer (rotating at 1000rpm) for 8h, centrifuge the mixed dispersion obtained at 4500rpm for 30min to get the supernatant, and stir and blend the supernatant with deionized water. Vacuum filtra...

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Abstract

The invention discloses a preparation method of a nanocellulose / molybdenum disulfide piezoelectric composite film, the preparation method comprises the following steps: dispersing cellulose nanofibers into deionized water, carrying out ultrasonic treatment and centrifugation to obtain a nanocellulose aqueous dispersion, and storing at low temperature; mixing and dispersing molybdenum disulfide powder and triethanolamine or mixing and dispersing molybdenum disulfide powder and glycerol / urea, taking supernatant, stirring and blending supernatant and deionized water, performing vacuum suction filtration, dispersing a final suction filtration product into deionized water, and drying to obtain a molybdenum disulfide nanosheet; and adding the obtained molybdenum disulfide nanosheet into the nano-cellulose aqueous dispersion, removing bubbles after ultrasonic dispersion, pouring into a mold, and drying to form a film. Along with the addition of molybdenum disulfide, the layered structure of the composite film becomes more obvious, the layered structure becomes more orderly, and good structural compatibility is shown. Besides, the stacked molybdenum disulfide sheets are few, and the defects of the cross section are few, so that the molybdenum disulfide nanosheets are well dispersed in the nanocellulose matrix.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a preparation method of a nano-cellulose / molybdenum disulfide piezoelectric composite film. Background technique [0002] Piezoelectric materials can convert mechanical energy into electrical energy. Since the discovery of the piezoelectric effect by the Curie brothers, piezoelectric materials have been developed for a long time, and now they have been applied in wearable sensing devices, nanogenerators and other fields. Piezoelectric ceramics have the advantage of large piezoelectric effect, but their use is limited due to the difficulty in forming and processing. Piezoelectric polymer PVDF is easy to form and has good flexibility, but its piezoelectric performance is far from that of piezoelectric ceramics, and it has toxic fluorine involved in its processing and synthesis, which has certain pollution to the environment. Biomass material cellulose has the charact...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L1/02C08K7/00C08K3/30C08J5/18
CPCC08J5/18C08J2301/02C08K2201/011C08K7/00C08K2003/3009
Inventor 杨全岭王士伟吴涛石竹群宋毅恒包江锴唐宇晗邹秉谕熊传溪
Owner WUHAN UNIV OF TECH
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