A co-precipitation and annealing route to the large-quantity synthesis of boron nitride nanotubes
A co-precipitation and annealing route to the large-quantity synthesis of boron nitride nanotubes
复制标题
大规模合成氮化硼纳米管的共沉淀和退火路线
DOI：
10.1016/j.solidstatesciences.2013.08.005
复制
发表时间：
2013-11-01
影响因子：
3.5
通讯作者：
Su, Qiaoqiao
中科院分区：
文献类型：
--
作者：
Bi, Xiaofan;Yin, Yanchun;Su, Qiaoqiao
以无定形硼粉、九水合硝酸铁（Fe（NO3）（3）中心点9 H（2）O）和尿素（CO（NH 2）（2））为原料，采用共沉淀-退火法制备了大量的氮化硼纳米管（BNNTs）。首先通过共沉淀工艺制备中间体Fe（OH）（3）中心点B，然后在流动的氨气氛中在1200 ℃下退火。结果表明，在退火过程中，800 ℃的热处理有利于BNNT的生长。BNNT的平均直径为70 nm，具有竹状和准圆柱状结构。退火温度对BNNT的形成有很大影响。在较低温度（例如1100摄氏度）下只能获得BN颗粒，而在较高温度（例如1300摄氏度）下制造刺状纳米片修饰的BNNT。BNNTs的生长机制为固-液-固（SLS）和汽-液-固（VLS）相结合的机制。(C)2013年Elsevier Masson SAS。All rights reserved.
A novel co-precipitation and annealing route to the large-quantity synthesis of boron nitride nanotubes (BNNTs), using amorphous boron powder, iron nitrate nonahydrate (Fe(NO3)(3)center dot 9H(2)O) and urea (CO(NH2)(2)) as the raw materials, was demonstrated. An intermediate Fe(OH)(3)center dot B was firstly prepared through a co-precipitation process and then annealed in flowing ammonia atmosphere at 1200 degrees C. It was found that the heat treatment at 800 degrees C during the annealing process could favor the growth of BNNTs. The BNNTs had an average diameter of 70 nm and possessed bamboo and quasi-cylindrical structures. The annealing temperature greatly affected the formation of BNNTs. Only BN particles could be obtained at lower temperature (e.g. 1100 degrees C), whereas thorn-like nanosheet-decorated BNNTs were fabricated at higher temperature (e.g. 1300 degrees C). A combination mechanism of solid-liquid-solid (SLS) and vapor-liquid-solid (VLS) model was suggested to be responsible for the growth of BNNTs. (C) 2013 Elsevier Masson SAS. All rights reserved.