One-Minute Joule Annealing Enhances the Thermoelectric Properties of Carbon Nanotube Yarns via the Formation of Graphene at the Interface
One-Minute Joule Annealing Enhances the Thermoelectric Properties of Carbon Nanotube Yarns via the Formation of Graphene at the Interface
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DOI：
10.1021/acsaem.9b01736
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发表时间：
2019-10-01
影响因子：
6.4
通讯作者：
Hayashi, Yasuhiko
中科院分区：
文献类型：
--
作者：
Hada, Masaki;Hasegawa, Taisuke;Hayashi, Yasuhiko
纳米碳材料中的界面非常重要，因为它们决定了碳基器件的性能。就载流子和热传输性质而言，界面特征通常比内在特征更重要。在此，我们描述了碳纳米管 (CNT) 纱线的 1 分钟焦耳退火如何将界面无定形碳转化为石墨烯碎片。经过 1 分钟焦耳退火后，我们在室温下获得了具有极高塞贝克系数（+/- 100 mu V/K）和高热电功率因数（400 和 1000 mu W/mK(2)）的多壁碳纳米管纱线，无论是否掺杂聚乙烯亚胺。理论模拟和实验测量有助于确定最佳退火条件，使纱线中成束的 CNT 之间的界面无定形碳在接近 2000 K 的温度下快速转变为石墨烯碎片。本方法代表了能源材料科学的重大进展，因为它为纳米碳材料界面的设计提供了指导原则，并在能量收集系统中具有潜在的应用。
Interfaces in nanocarbon materials are highly important, as they determine the properties of carbon-based devices. In terms of carrier and thermal transport properties, the interfacial features are often more important than the intrinsic characteristics. Herein, we describe how 1 min Joule annealing of carbon nanotube (CNT) yarns can convert the interfacial amorphous carbon into graphene fragments. After 1 min Joule annealing, we have obtained multiwalled CNT yams with extremely high Seebeck coefficients (+/- 100 mu V/K) and high thermoelectric power factor (400 and 1000 mu W/mK(2)) at room temperature, both with or without polyethylenimine doping. Theoretical simulations and experimental measurements helped to determine the optimal annealing conditions in terms of a rapid transformation of the interfacial amorphous carbon between the bundled CNTs in the yarn into graphene fragments at similar to 2000 K. The present approach represents significant progress in energy materials science, as it provides a guiding principle for the design of interfaces in nanocarbon materials with potential applications in energy-harvesting systems.