File Download

  • Find it @ UNIST can give you direct access to the published full text of this article. (UNISTARs only)
Related Researcher

DingFeng

Ding, Feng
Read More

Views & Downloads

Detailed Information

Cited time in webofscience Cited time in scopus
Metadata Downloads

Growth of Boron Nitride Nanotube Over Al-Based Active Catalyst and its Application in Thermal Management

Author(s)
He, QianDing, LipingWu, LiyunZhou, ZhengyangWang, YingXu, TaoWang, NanyangZhang, KaiWang, XuebinDing, FengZhang, JinYao, Yagang
Issued Date
2023-04
DOI
10.1002/sstr.202200282
URI
https://scholarworks.unist.ac.kr/handle/201301/62441
Citation
SMALL STRUCTURES, v.4, no.4, pp.2200282
Abstract
The effective identification of the active catalytic phase is essential to elucidate the growth mechanism of boron nitride nanotubes (BNNTs) and realize their controllable and scalable synthesis. However, owing to the complexity of chemical reactions during BNNT growth via chemical vapor deposition (CVD) and the lack of techniques for in situ characterization at high temperatures (1100-1300 degrees C), identifying the true catalyst during BNNT growth is challenging. Herein, an aluminum (Al)-based active catalyst for BNNT growth via CVD is investigated. The initial Al2O3 nanoparticle catalyst precursor is transformed into an Al-B phase prior to BNNT growth. Based on our density functional theory-based molecular dynamic simulations of BNNT nucleation, AlBx (x = 1.5 to 2) shows catalytic activity for the formation of BN chains and BN six-membered rings. Confirmatory experiments demonstrate that AlB2 is the active Al-based catalyst during BNNT growth. A nanocomposite is prepared from cellulose nanocrystal, and purified BNNTs exhibited a high in-plane thermal conductivity of 13.33 W m(-1) K-1 at 20 wt% BNNTs. A further application for light-emitting diode chip cooling demonstrates excellent heat-dissipation performance of the nanocomposite film. Thus, this study can guide the controllable synthesis of high-quality BNNTs and facilitate their use in thermal interface materials.
Publisher
WILEY
ISSN
2688-4062
Keyword (Author)
Al-based active catalystsboron nitride nanotubesdensity functional theorygrowth mechanismsthermal management
Keyword
HIGH-YIELDALUMINUMPRECURSORMICROSTRUCTUREPRESSURE

qrcode

Items in Repository are protected by copyright, with all rights reserved, unless otherwise indicated.