title: Large-scale fabrication of boron nitride nanotubes with high purity via solid-state reaction method.
abstract: An effective solid-state reaction method is reported for synthesizing boron nitride nanotubes (BNNTs) in large scale and with high purity by annealing amorphous boron powder and ferric chloride (FeCl3) catalyst in ammonia atmosphere at elevated temperatures. FeCl3 that has rarely been utilized before is introduced not only as a catalyst but also as an efficient transforming agent which converts boron powder into boron chloride (BCl3) vapor in situ. The nanotubes are bamboo in shape and have an average diameter of about 90 nm. The effect of synthetic temperatures on nanotube morphology and yield is investigated. The photoluminescence (PL) measurement shows emission bands of the nanotubes at 354, 423, 467, and 666 nm. A combined growth mechanism of vapor-liquid-solid (VLS) and solid-liquid-solid (SLS) model is proposed for the formation of the BNNTs.
authors.affiliation: College of Chemistry & Chemical Engineering, Guangxi University, Nanning 530004, China.
authors.forename: An
authors.initials: A
authors.lastname: Pan
authors.affiliation: College of Chemistry & Chemical Engineering, Guangxi University, Nanning 530004, China ; Key Lab of Advanced Materials of Tropical Island Resources, Ministry of Education, College of Materials and Chemical Engineering, Hainan University, Haikou 570228, China.
authors.forename: Yongjun
authors.initials: Y
authors.lastname: Chen
keywords: Boron nitride nanotubes; Fabrication; Growth mechanism; Photoluminescence property