Modification of thermal transport in an individual carbon nanofiber by focused ion beam irradiation
Modification of thermal transport in an individual carbon nanofiber by focused ion beam irradiation
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DOI：
10.1016/j.carbon.2019.07.056
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发表时间：
2019-11
期刊：
影响因子：
10.9
通讯作者：
M. Narasaki;Qinyi Li;T. Ikuta;J. Miyawaki;Koji Takahashi
中科院分区：
文献类型：
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作者：
M. Narasaki;Qinyi Li;T. Ikuta;J. Miyawaki;Koji Takahashi
报道了聚焦离子束（FIB）辐照改性碳纳米管（CNF）的原位热测量。FIB辐照导致CNF晶体结构局部非晶化。通过修正散射离子对传感器的影响，改进了原位测量。原始CNF的低有效热导率（1.39W/mK）是由许多单独的石墨纤维制成的各向异性结构造成的。第一次FIB照射使热导率降低约3.2%。这种相对较小的减少归因于CNF的结构，其由许多单独的纤维组成，其中一些纤维甚至在FIB照射后仍保持原始。使用热电路模型的分析表明，在CNF的热输运可以包括在微米范围内的声子的弹道特征。我们提出的原位热测量方法可以扩展到各种结构改性纳米材料的热输运研究。
We report on the in situ thermal measurement of a carbon nanofiber (CNF) modified by focused ion beam (FIB) irradiation. The FIB irradiation led to local amorphization of the crystalline structure of the CNF. The in situ measurement was improved by correcting for the effect of the scattered ions on the sensor. The low effective thermal conductivity of the pristine CNF (∼39 W/mK) resulted from the anisotropic structure made of many individual graphitic fibers. The first FIB irradiation decreased the thermal conductivity by approximately 3.2%. This relatively small decrease is attributed to the structure of the CNF consisting of many individual fibers, with some fibers remaining pristine even after the FIB irradiation. Analysis using a thermal-circuit model suggested that the thermal transport in the CNF could include a ballistic feature of phonons in the micrometer range. Our proposed in situ thermal measurement method can be extended to the study of thermal transport in various structurally modified nanomaterials.