Enhanced In-Plane Thermal Conductance of Thin Films Composed of Coaxially Combined Single-Walled Carbon Nanotubes and Boron Nitride Nanotubes

Pengyingkai Wang, Yongjia Zheng, Taiki Inoue, Rong Xiang, Ahmed Shawky, Makoto Watanabe, Anton Anisimov, Esko I. Kauppinen, Shohei Chiashi, Shigeo Maruyama

Research output: Contribution to journalArticleScientificpeer-review

Abstract

Carbon nanotubes (CNTs) and boron nitride nanotubes (BNNTs) are one-dimensional materials with high thermal conductivity and similar crystal structures. Additionally, BNNTs feature higher thermal stability in air than CNTs. In this work, a single-walled carbon nanotube (SWCNT) film was used as a template to synthesize a BNNT coating by the chemical vapor deposition (CVD) method to form a coaxial heterostructure. Then, a contact-free steady-state infrared (IR) method was adopted to measure the in-plane sheet thermal conductance of the as-synthesized film. The heterostructured SWCNT-BNNT film demonstrates an enhanced sheet thermal conductance compared with the bare SWCNT film. The increase in sheet thermal conductance shows a reverse relationship with SWCNT film transparency. An enhancement of over 80% (from ∼3.6 to ∼6.4 μW·K-1·sq-1) is attained when the BNNT coating is applied to an SWCNT film with a transparency of 87%. This increase is achieved by BNNTs serving as an additional thermal conducting path. The relationship between the thermal conductance increase and transparency of the SWCNT film is studied by a structured modeling of the SWCNT film. We also discuss the effect of annealing on the thermal conductance of SWCNTs before BNNT growth. Along with the preservation of high electrical conductance, the enhanced thermal conductance of the heterostructured SWCNT-BNNT films makes them a promising building block for thermal and optoelectronic applications.

Original languageEnglish
Pages (from-to)4298-4305
Number of pages8
JournalACS Nano
Volume14
Issue number4
DOIs
Publication statusPublished - 28 Apr 2020
MoE publication typeA1 Journal article-refereed

Keywords

  • boron nitride nanotube
  • chemical vapor deposition
  • in-plane sheet thermal conductance
  • infrared thermography
  • single-walled carbon nanotube film
  • van der Waals heterostructure

Fingerprint Dive into the research topics of 'Enhanced In-Plane Thermal Conductance of Thin Films Composed of Coaxially Combined Single-Walled Carbon Nanotubes and Boron Nitride Nanotubes'. Together they form a unique fingerprint.

  • Cite this