接口工程核心外量子点使得高压直流应用的聚合物纳米电介质中的载体限制成为可能
Heyu Wang1,2, Zhonglei Li1,2, Zechao Yang1,2
1School of Electrical and Information Engineering, Tianjin University, Tianjin 300072, China.
ACS applied materials & interfaces
|June 30, 2025
概括
新型聚合物纳米电介质使用化/硫化核心外量子点显著改善高压直流绝缘. 这些材料减少了电荷迁移,并增强了故障强度,以实现可靠的功率传输.
科学领域:
- 材料科学 材料科学 材料科学
- 电气工程 电气工程
- 聚合物科学 聚合物科学
背景情况:
- 可靠的聚合物介电材料对于高压直流 (HVDC) 电力传输至关重要.
- 电荷载体迁移在极端电场和温度下限制了聚合物介电性能.
研究的目的:
- 以CdSe@ZnS核心外量子点 (QDs) 修改的聚乙烯 (PE) 为基础的新型聚合物纳米电介质的工程.
- 调查QD修改对电荷载体迁移和PE的分解强度的影响.
主要方法:
- 使用溶剂辅助混合制造PE/QD纳米复合材料的制造.
- 对于QD分散的微结构分析.
- 在各种温度下测量电导率和断裂强度.
- 热刺激脱极化电流 (TSDC) 分析.
- 接口能源障碍的第一原则计算.
主要成果:
- 优化0.10重量%的QD修改PE显示,在30°C时DC导电率降低了59.2%,在90°C时降低了70.2%.
- 在90°C时,分解强度提高了25.1%.
- 核心外的QD引入了深陷能量水平 (1.007-1.075 eV) 和高界面能量屏障 (高达5.31 eV),有效地定位电荷载体.
- 过度的QD度 (>0.15重量%) 导致由于重叠和加强道挖掘,性能下降.
结论:
- CdSe@ZnS核心外QD在工程聚合物纳米电解电中是有效的,用于HVDC应用.
- 双载体定位机制 (深陷和量子封闭) 提高了绝缘性能.
- 必须优化QD度以防止性能下降.
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