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Enhanced inverse piezoelectricity in flexible PVDF composites via mesoporous silica-coated BST core-shell submicron fillers
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DOI：10.1039/d6nj00873a.png)
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Abstract
En 中文
Polyvinylidene fluoride (PVDF)-based piezoelectric materials show strong potential for use in flexible sensors and actuators. However, increasing the proportion of the electroactive beta phase and improving interfacial compatibility with inorganic fillers remain major challenges. In this study, an interfacial transition-layer strategy is proposed using mesoporous SiO2 (mSiO2) to coat barium strontium titanate submicron particles (BST@mSiO2 SMPs). This alleviates the organic-inorganic interface mismatch and forms a coherent BST-mSiO2-PVDF transition structure. This architecture not only strengthens interfacial adhesion but also facilitates the crystallization of the electroactive beta phase. Fourier-transform infrared spectroscopy reveals that at a BST@mSiO2 loading of 0.4 wt%, the composite attains a total beta- and gamma-phase content of 79%, with the pure beta phase contributing 69%. When an external voltage is applied, the composite film exhibits self-excited vibration with a maximum displacement amplitude of 110 & micro;m. These results demonstrate that interfacial transition-layer engineering is an effective approach for developing high-performance PVDF-based piezoelectric composites for flexible electronic devices and smart systems.
Keywords:
DIELECTRIC-PROPERTIES
ENERGY DENSITY
FABRICATION
NANOCOMPOSITES
NANOPARTICLES
EFFICIENCY
BEHAVIOR
POWER
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