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通过量子尺寸效应调节的热电性质在近一个维的γ-Graphdiyne纳米带中

Mi Li¹, Qiaohan Liu¹, Yi Zou¹

¹College of Science, Liaoning Petrochemical University, Fushun 113001, China.

Molecules (Basel, Switzerland)

|July 27, 2024

概括

这项研究表明,状的g-graphdiyne纳米丝带比扶手椅变体具有较低的导热率. 这种热电性质的异构性对于优化纳米设备中的能量转换至关重要.

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:

热电 (TE) 材料将热能转化为电能.
一维纳米结构为TE应用提供了独特的特性.
基于Graphdiyne的材料正在成为先进电子产品的有希望的候选者.

研究的目的:

为了研究一维的γ-GDYNRs的热电特性.
了解 γ-GDYNRs 中热导电性的异构性.
确定增强 TE 转换效率的结构特征.

主要方法:

使用密度函数理论 (DFT) 结合非平衡格林函数 (NEGF-DFT) 方法.
计算和分析了热电特性,重点是导热率和功率因子.
研究了纳米丝带边缘类型 (齐格萨克与扶手椅) 和宽度对 TE 性能的影响.

主要成果:

在γ-GDYNRs的热导率中观察到显著的异质性.
发现曲边缘的γ-GDYNRs (γ-ZGDYNRs) 与扶手椅边缘的γ-graphdiyne纳米丝带 (γ-AGDYNRs) 相比,其晶格导热率要低得多.
揭示了g-AGDYNRs在所有频率中表现出更广泛的声子分散,解释了观察到的异性质.
指出,随着纳米丝带宽度的下降,导向依赖性就会加剧.
确定了具有优越功率因子和降低热导率的特定椅子边缘的γ-GDYNRs (γ-Z(2) GDYNRs,宽度为1.639 nm).

结论:

γ-GDYNRs根据其边缘结构和宽度表现出可调节的热电特性.
在 γ-GDYNRs 中,热导率的内在异质性可以被利用来提高热电性能.
扶手椅边的γ-GDYNRs,特别是γ-Z(2) GDYNRs,显示出高热电转换效率的巨大潜力,超过其他γ-GDYNR结构.

关键词:

其他GDYNRs.乐队乐队乐队乐队乐队一维材料是一维材料.导热率导热率导热率导热率导热率导热率热电能是热电的产品.

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