Cellulose-based piezoelectric composites, elastic piezoelectric devices, and methods of making the same

By preparing a three-dimensional cellulose framework and combining gradient impregnation, vacuum assistance, and multilayer stacking, the problems of substrate brittleness and weak interfacial bonding in cellulose-based piezoelectric composites were solved, thereby improving their piezoelectric output performance and environmental stability.

CN122294827APending Publication Date: 2026-06-26GUANGXI UNIV
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Patent Information

Application Number
CN202610190546.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-02-10
Publication Date
2026-06-26

AI Technical Summary

Technical Problem

Existing cellulose-based piezoelectric composite materials suffer from problems such as high substrate brittleness, uneven dispersion of functional fillers, and weak interfacial bonding, resulting in insufficient mechanical properties and environmental stability, which affects the piezoelectric output performance and reliability of the devices.

Method used

A three-dimensional cellulose framework was prepared using biomass raw materials. By combining gradient impregnation and vacuum-assisted technology, ion coordination and two-dimensional material composites were used to enhance interfacial bonding through in-situ synthesis of metal oxides. Finally, an elastic polymer was used for encapsulation to form a multi-layer stacked structure to improve the flexibility and stability of the material.

Benefits of technology

It achieves efficient loading and robust bonding of functional components, significantly improving piezoelectric response performance, device mechanical strength, and environmental stability, and can achieve high voltage output of not less than 6 V.

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Abstract

This invention discloses a cellulose-based piezoelectric composite material, a piezoelectric device, and its preparation method, belonging to the technical field of piezoelectric materials and flexible electronic devices. Addressing the problems of low stress transfer efficiency and limited output performance in traditional piezoelectric devices due to low substrate flexibility, uneven dispersion of piezoelectric fillers, and weak interfacial bonding, this invention first involves microwave treatment and chemical pretreatment of biomass raw materials to remove lignin and hemicellulose while retaining their three-dimensional porous structure, resulting in a cellulose framework. The framework is then functionalized through methods such as impregnation with metal ion solutions, vacuum impregnation with a two-dimensional material dispersion after surface modification, or further in-situ synthesis of metal oxides via hydrothermal reaction. Finally, it is impregnated with PVDF or PDMS solutions and compressed and cured to form an elastic composite material. This method utilizes a biomass template to achieve uniform loading and ordered composite of functional components, and polymer encapsulation enhances interfacial stability. It is primarily used for micro-energy harvesting and self-powered sensing in flexible wearable devices.
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