Piezoelectric composite material with piezoelectric particles and metal nanorods arranged in co-chain manner and preparation method

Abstract

The invention discloses a piezoelectric composite material with piezoelectric particles and metal nanorods arranged in a co-chain mode and a preparation method and belongs to the field of flexible piezoelectric composite materials. Barium calcium zirconate titanate (BCZT) prepared by a solid-phase sintering method is selected as a piezoelectric phase, copper nanorods (Cu NRs) are selected as a conductive phase, and the BCZT / Cu NRs / PDMS flexible piezoelectric composite material with piezoelectric particles / conductive nanorods in co-chain arrangement is prepared by applying an alternating electric field. The composite material has high current density and thermal conductivity, and has important application value in the field of flexible piezoelectric energy collection.

Description

technical field [0001] The invention belongs to the field of flexible piezoelectric composite materials, in particular to a BCZT / Cu NRs / PDMS flexible piezoelectric energy collection composite material with piezoelectric particles / conductive nanorods co-chain arrangement and a preparation method thereof. Background technique [0002] The rapid development of the Internet of Things (IoTs) has stimulated researchers' enthusiasm for flexible piezoelectric materials in the field of energy harvesting. Among them, the composite of piezoelectric particles with polydimethylsiloxane (PDMS) has been shown to achieve high voltage output while maintaining the flexibility of the material. However, due to the flexible characteristics of the PDMS matrix, when stress is applied to the surface of the material, the strain exhibits obvious hysteresis, and the isolated piezoelectric phase cannot be transmitted to the upper and lower plates of the material in time due to the high impedance of the...

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Problems solved by technology

However, the excessive addition of the conductive phase will lead to an abnormal increase in the leakage current of the material during the polarization process, so that the polarization voltage cannot be effectively applied to the piezoelectric phase, which largely limits the further improvement of the current density.

[0004] On the other hand, in the process of frequent extrusion and bending, the flexible piezoelectric material will continuously generate heat due to deformation, which will increase the temperature of the material, which may lead to the deterioration of the performance of the piezoelectric material.

However, related studies have shown that in isotropic composite materials, the thermal conductivity depends on the properties of the material as a whole, while the thermal conductivity of the PDMS matrix is ​​only 0.18W / (m K)

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