Carbyne is a sp linear carbon chain (LCC) with characteristics of strong chemical reactivity and extreme instability under environmental conditions, which has become an obstacle to the application of LCC with high thermal and electrical conductivity. Utilizing CNT as a container to store LCC is one of the most feasible ways to realize LCC applications. However, current research of LCC encapsulated in CNT (LCC@CNT) focuses on its preparation and lacks of in-depth exploration of the intrinsic heat transfer mechanism. This paper reports the high axis thermal conductivity of LCC@CNT, explore the thermal transport enhancement degree of LCC@CNT under a wide temperature range and multiple diameters, and analyzed the underling mechanism through crucial thermal parameters and phonon theory. When LCC is loaded in CNT, the axial thermal conductivity of CNT is further increased by 15 %. Moreover, LCC@CNT shows the lower sensitivity diameter than pristine CNT. This work is expected to provide data support for the application of LCC, the lower production standard of CNT, and also attempt the higher efficient one-dimensional thermal energy transfer micro devices.

中文翻译：

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碳纳米管封装的线性碳链具有非凡的导热性

Carbyne是sp3线性碳链(LCC)，具有化学反应性强、环境条件下极度不稳定的特点，成为高导热、导电性LCC应用的障碍。利用CNT作为存储LCC的容器是实现LCC应用最可行的途径之一。然而，目前碳纳米管封装LCC（LCC@CNT）的研究主要集中在其制备上，缺乏对内在传热机制的深入探索。本文报道了LCC@CNT的高轴热导率，探讨了LCC@CNT在宽温度范围和多个直径下的热传输增强程度，并通过关键热参数和声子理论分析了其基本机制。当LCC负载在CNT中时，CNT的轴向热导率进一步提高了15%。此外，LCC@CNT 显示出比原始 CNT 更低的灵敏度直径。该工作有望为LCC、碳纳米管生产标准较低的应用提供数据支持，同时也尝试更高效的一维热能传递微型器件。