一维Graphdiyne纳米带在不同的应力规则下具有的热电特性
Shiyue Li1, Yi Zou1, Lulu Sun2
1College of Science, Liaoning Petrochemical University, Fushun, 113001, People's Republic of China.
Scientific reports
|July 2, 2025
概括
与扶手椅类型相比,齐格扎格石墨烯纳米带具有优越的热电特性. 施加轴应力提高了它们的效率,使它们成为热电应用的前景.
科学领域:
- 材料科学 材料科学 材料科学
- 凝聚物质物理学 凝聚物质物理学
- 纳米技术 纳米技术
背景情况:
- 石墨烯纳米带 (GDYNRs) 是有前途的2D材料,具有可调节的电子和热性能.
- 了解结构几何学 (扶手椅与齐克扎克) 和外部刺激 (压力) 的影响对于优化它们的热电性能至关重要.
研究的目的:
- 从理论上研究椅子类型 (2-AGDYNR) 和齐克扎克类型 (2-ZGDYNR) 石墨丁纳米带的热电特性.
- 分析不同轴应力对它们的能量波段,载体度,电导率,热导率和热电功率 (ZT) 的影响.
主要方法:
- 使用非平衡格林函数 (NEGF) 方法进行理论计算.
- 在不同的压力条件下模拟和分析2-AGDYNR和2-ZGDYNR的行为.
主要成果:
- 2-ZGDYNR的晶格导热率明显低于2-AGDYNR,突出了GDYNR中异性热传输.
- 2-ZGDYNR具有更高的功率系数和更低的导热率,因此与2-AGDYNR相比,ZT值更高.
- 在 -1.5 GPa的轴应力下,2-ZGDYNR的最大ZT为1.115得到实现,这表明了最佳的热电转换效率.
结论:
- 齐格扎克类型的石墨丁纳米带由于其固有的材料特性,比扶手椅类型具有更高的热电潜力.
- 施加的轴应力可以有效地调整和增强石墨纳米带的热电性能.
- 这项研究为在热电器件中开发应力工程制成的石墨二烯纳米带提供了理论基础.
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