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Modulating piezoelectricity and mechanical strength via three-dimensional gradient structure for piezoelectric
Tao Yang1, Weili Deng1, Guo Tian1
1Key Laboratory of Advanced Technologies of Materials (Ministry of Education), School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, P. R. China. weili1812@swjtu.edu.cn.
Materials Horizons
|September 1, 2023
Summary
This study introduces a gradient piezoelectric nanocomposite for advanced electronics. The novel design significantly enhances both mechanical strength and electrical output for improved wearable device performance.
Area of Science:
- Materials Science
- Nanotechnology
- Polymer Science
Background:
- Advanced flexible electronics require materials with high wearing comfort and data accuracy.
- Piezoelectric composites offer potential but face limitations in balancing mechanical strength and electrical output.
- Existing nanocomposites struggle to achieve optimal performance due to constrained properties.
Purpose of the Study:
- To design and fabricate a gradient lead magnesium niobate-titanate (PMN-PT)/polyvinylidene fluoride (PVDF) nanocomposite.
- To enhance both the piezoelectric output and mechanical strength of the composite material.
- To investigate the structure-property relationships governing the performance of the gradient nanocomposite.
Main Methods:
- Utilized a non-equilibrium process combined with modified electrospinning and hot-pressing techniques.
- Fabricated a gradient PMN-PT/PVDF nanocomposite with a unique three-dimensional gradient distribution.
- Employed experimental validation and simulation to verify enhanced piezoelectric output and mechanical strength.
Main Results:
- Achieved excellent mechanical strength (830 MPa) and piezoelectric performance (1.08 V) in the gradient nanocomposite.
- Demonstrated substantially higher performance compared to randomly dispersed nanocomposites.
- Revealed the enhancement mechanism through analysis of polarization, stress, and crystallinity.
Conclusions:
- The gradient structure significantly improves the overall performance of PMN-PT/PVDF nanocomposites.
- The findings offer new insights into structure-related mechanical and electrical behaviors in nanocomposites.
- This work supports the rational design of high-performance nanocomposites for advanced flexible electronic applications.
