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

Masahiro Narasaki; Qin Yi Li; Tatsuya Ikuta; Jin Miyawaki; Koji Takahashi

doi:10.1016/j.carbon.2019.07.056

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

Masahiro Narasaki, Qin Yi Li, Tatsuya Ikuta, Jin Miyawaki, Koji Takahashi

Research output: Contribution to journal › Article › peer-review

7 Citations (Scopus)

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.

Original language	English
Pages (from-to)	539-544
Number of pages	6
Journal	Carbon
Volume	153
DOIs	https://doi.org/10.1016/j.carbon.2019.07.056
Publication status	Published - Nov 2019

All Science Journal Classification (ASJC) codes

Chemistry(all)
Materials Science(all)

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10.1016/j.carbon.2019.07.056

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title = "Modification of thermal transport in an individual carbon nanofiber by focused ion beam irradiation",

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.",

author = "Masahiro Narasaki and Li, {Qin Yi} and Tatsuya Ikuta and Jin Miyawaki and Koji Takahashi",

note = "Funding Information: This work was partially supported by JSPS KAKENHI (Grant Nos. JP17H03186 and JP18K13704 ), JST CREST Grant No. JPMJCR18I1 , and a Grant-in-Aid for JSPS Research Fellow No. JP18J11632 . The TEM observations were performed at the Ultramicroscopy Research Center at Kyushu University. Funding Information: This work was partially supported by JSPS KAKENHI (Grant Nos. JP17H03186 and JP18K13704), JST CREST Grant No. JPMJCR18I1, and a Grant-in-Aid for JSPS Research Fellow No. JP18J11632. The TEM observations were performed at the Ultramicroscopy Research Center at Kyushu University. Publisher Copyright: {\textcopyright} 2019",

year = "2019",

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doi = "10.1016/j.carbon.2019.07.056",

language = "English",

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AU - Narasaki, Masahiro

AU - Li, Qin Yi

AU - Ikuta, Tatsuya

AU - Miyawaki, Jin

AU - Takahashi, Koji

N1 - Funding Information: This work was partially supported by JSPS KAKENHI (Grant Nos. JP17H03186 and JP18K13704 ), JST CREST Grant No. JPMJCR18I1 , and a Grant-in-Aid for JSPS Research Fellow No. JP18J11632 . The TEM observations were performed at the Ultramicroscopy Research Center at Kyushu University. Funding Information: This work was partially supported by JSPS KAKENHI (Grant Nos. JP17H03186 and JP18K13704), JST CREST Grant No. JPMJCR18I1, and a Grant-in-Aid for JSPS Research Fellow No. JP18J11632. The TEM observations were performed at the Ultramicroscopy Research Center at Kyushu University. Publisher Copyright: © 2019

PY - 2019/11

Y1 - 2019/11

N2 - 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.

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

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