材料科学
成核
纳米棒
碳热反应
纳米技术
化学工程
碳纳米管
纳米结构
退火(玻璃)
化学气相沉积
纳米尺度
Crystal(编程语言)
复合材料
有机化学
化学
程序设计语言
碳化物
工程类
计算机科学
作者
Bo Wang,Xin Huang,Xiaonan Zhou,Qiang Zhi,Liucheng Hao,Zixuan Li,Shan Zhao,Baoqiang Hou,Jianfeng Yang,Kōzō Ishizaki
出处
期刊:Nanotechnology
[IOP Publishing]
日期:2020-01-24
卷期号:31 (19): 194001-194001
被引量:3
标识
DOI:10.1088/1361-6528/ab6fd7
摘要
One-dimensional Si3N4 nanostructures are desirable for constructing nanoscale electric and optoelectronic devices due to their peculiar morphologies. Herein, a facile and environmentally friendly catalyst-free method is proposed to synthesize ultra-long single crystal α-Si3N4 nanobelts via carbothermal nitridation of carbon nanotubes at 1750 °C. The obtained α-Si3N4 nanobelts with a flat surface (thickness of ∼150 nm, length of several millimeters) exhibited an extremely high aspect ratio, perfect crystal structure, and high specific surface area of 7.34-10.09 m2 g-1. In addition, the width was increased from approximately 80 nm to 8 μm by increasing the holding time from 1 to 3 h. The nanobelt formation was governed by the vapor-solid (VS) reaction between SiO vapor, N2 and carbon nanotubes, and the vapor-vapor reaction between SiO, CO and N2. The former was responsible for the initial nucleation and successive base-growth of α-Si3N4 nanotubes. The latter additionally contributed to the nanorod and subsequent proto-nanobelt formation and to the growth of the nanobelts. During high-temperature annealing at 1750 °C, the original Si3N4 nanotubes gradually transformed into nanorods, and, finally, nanobelts with stable shapes as a result of surface energy minimization.
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