Synthesis of Multiwall Boron Nitride (BN) Nanotubes by a PVD Method Based on Vapor-Liquid-Solid Growth.

Hao Guo,Yonggang Xu,Xiaojian Mao,Hetuo Chen,Jian Zhang,Guohong Zhou,Zhengjuan Wang,Shiwei Wang

doi:10.3390/ma13040915

Abstract

Multiwall boron nitride (BN) nanotubes were synthesized by a novel physical vapor deposition (PVD) method, in which the BN nanotubes grow on a compact substrate composed of AlN, γ-Al2O3, Y2O3, and carbon powders. The obtained BN nanotubes assemble in an orderly manner with a typical length of over one millimeter and a diameter of one-hundred nanometers. The hollow multiwall tubes have a spherical tip, which is presumed to be a liquid drop at the synthesis temperature, indicating the vapor–liquid–solid (VLS) growth mechanism.

Highlights

Boron nitride (BN) nanotubes are structurally analogue to carbon nanotubes—they substituteBand N atoms entirely for C atoms in graphitic-like sheets with nearly no change in the atomic spacing [1,2,3]—but exhibit superior thermal and chemical performances to carbon-based materials [4].there has been a growing interest in utilizing boron nitride (BN) nanotube materials in specific applications in high-temperature or chemically hazardous environments in recent years [3]
It is notable that the length of the nanotubes is over one millimeter and the volume of the products indicates that the BN nanotubes could be manufactured on an industrial scale
Multiwall BN nanotubes were synthesized by a physical vapor deposition (PVD) method, where hexagonal boron nitride (h-BN) ceramics wereInused as a BNmultiwall source

Summary

Introduction

Boron nitride (BN) nanotubes are structurally analogue to carbon nanotubes—they substituteBand N atoms entirely for C atoms in graphitic-like sheets with nearly no change in the atomic spacing [1,2,3]—but exhibit superior thermal and chemical performances to carbon-based materials [4].there has been a growing interest in utilizing BN nanotube materials in specific applications in high-temperature or chemically hazardous environments in recent years [3]. Boron nitride (BN) nanotubes are structurally analogue to carbon nanotubes—they substitute. Afterwards, many other synthesizing methods were developed, such as laser ablation [7], chemical vapor deposition [8], the heating of milled mixtures [9,10], the plasma-jet method [11], and atom deposition [12]. Most of these methods are too complicated to be suitable for industrial manufacturing

Methods

Results

Conclusion