Growth mechanism of silica nanowires without a metal catalyst via oxyacetylene torch ablation

详细信息	查看全文 | 推荐本文 |

• 作者：Zhaoqian Li ; Hejun Li ; ^{lihejun@nwpu.edu.cn} ; Kezhi Li ; Shouyang Zhang
• 关键词：Nanoparticles ; Nanowires ; Crystal growth ; Microstructure ; Oxyacetylene torch
• 刊名：Materials Letters
• 出版年：2012
• 期刊代码：59_0167577x
• 类别：ms
• 出版时间：1 May, 2012
• 卷：74
• 期：Complete
• 页码：118-120
• 文件大小：618 K

摘要

In this paper, for the first time, silica nanowires (SiONWs) were synthesized without a metal catalyst via ablation of SiC-containing coating under oxyacetylene torch. The growth mechanism of silica nanowires was discussed by using a developed vapor-liquid-solid (VLS) and oxide-assisted growth (OAG) model. Silica nanoparticles as a growth catalyst provided silicon and oxygen atoms for the formation of the nanowires and served as a growth site as well. In the center region, silica nanowires with an even diameter of 150 nm and a length up to more than 100 渭m formed during the cooling process. In the outer region, silica nanowires were synthesized during the ablation process and finally grew into a cauliflower-like silica layer.