在聚乙烯化物中的不同晶体微区域的电响应
Mengyue Su1, Jun Zhou1, Yuqing Chen1
1Center of Nanomaterials for Renewable Energy, State Key Laboratory of Electrical Insulation and Power Equipment, Xi'an Jiaotong University, Xi'an 710049, China.
Nanomaterials (Basel, Switzerland)
|October 15, 2024
概括
聚乙烯化物 (PVDF) 水晶相对介电和压电性能有很大的影响. 这项研究表明,α相具有较差的电荷保留,而β相在压电应用中表现出必要的极化逆转.
科学领域:
- 材料科学 材料科学 材料科学
- 聚合物科学 聚合物科学
- 凝聚物质物理学 凝聚物质物理学
背景情况:
- 聚乙烯化物 (PVDF) 是一种具有显著介电和压电性能的多功能聚合物.
- PVDF的晶相决定了它的功能性能,其中α和β相特别有趣.
- 了解这些相的微观行为对于优化基于PVDF的设备至关重要.
研究的目的:
- 为了研究PVDFα和β晶体相对微观水平的电刺激的不同反应.
- 阐明两种PVDF相之间的电荷移动性,极化和压电特性之间的差异.
- 通过了解多相贡献,为设计先进的PVDF介电材料提供洞察力.
主要方法:
- 制备具有明显α和β结晶相的PVDF薄膜.
- 在位凯尔文探针力显微镜 (KPFM) 用于电荷注入和移动性分析.
- 压电力显微镜 (PFM) 用于极化操纵和压电响应评估.
主要成果:
- α阶段具有较低的电荷注入屏障和更快的电荷消散,导致与β阶段的界面电荷积累.
- 在应用偏差 (±10 V) 下,α相没有显示偏振逆转.
- β相表现出明显的极化逆转和压电振幅的显著增加,与其极性相一致.
结论:
- PVDF的晶相极大地影响了其电气和压电行为.
- 由于其极性特征和极化逆转能力,β相对于实现功能性压电反应至关重要.
- 这项研究为针对性设计具有增强介电和压电性能的PVDF材料提供了有价值的数据.
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