Modification of thermal transport in an individual carbon nanofiber by focused ion beam irradiation

Masahiro Narasaki, Qinyi Li, Tatsuya Ikuta, Jin Miyawaki, Koji Takahashi

研究成果: ジャーナルへの寄稿記事

抄録

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.

元の言語英語
ページ(範囲)539-544
ページ数6
ジャーナルCarbon
153
DOI
出版物ステータス出版済み - 11 1 2019

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Carbon nanofibers
Focused ion beams
Irradiation
Fibers
Thermal conductivity
Amorphization
Phonons
Ballistics
Nanostructured materials
Hot Temperature
Ions
Crystalline materials
Networks (circuits)
Sensors

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)

これを引用

Modification of thermal transport in an individual carbon nanofiber by focused ion beam irradiation. / Narasaki, Masahiro; Li, Qinyi; Ikuta, Tatsuya; Miyawaki, Jin; Takahashi, Koji.

:: Carbon, 巻 153, 01.11.2019, p. 539-544.

研究成果: ジャーナルへの寄稿記事

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abstract = "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.",
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AU - Takahashi, Koji

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