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 journalArticlepeer-review

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 languageEnglish
Pages (from-to)539-544
Number of pages6
JournalCarbon
Volume153
DOIs
Publication statusPublished - Nov 2019

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)

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