Catalytic preparation of α-silicon nitride single-crystalline nanowires by layered double hydroxides

LEI Chao; LI Kefeng; WANG Jian; MAO Xinhua; ZOU Liming; XIE Huanwen

doi:10.11949/j.issn.0438-1157.20180760

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Catalytic preparation of α-silicon nitride single-crystalline nanowires by layered double hydroxides

更新时间：2025-12-10

- Catalytic preparation of α-silicon nitride single-crystalline nanowires by layered double hydroxides
- CIESC Journal Issue 10, Pages: 4471-4478(2018)
- 作者机构：
  
  广东省科学院广东省材料与加工研究所,广东,广州,510650
- 作者简介：
- 基金信息：
- DOI：10.11949/j.issn.0438-1157.20180760
  CLC： B32
- Online First：05 October 2018，
  
  Published：05 October 2018
- 稿件说明：
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LEI Chao, LI Kefeng, WANG Jian, et al. Catalytic preparation of α-silicon nitride single-crystalline nanowires by layered double hydroxides[J]. CIESC Journal, 2018, (10): 4471-4478.
DOI：

LEI Chao, LI Kefeng, WANG Jian, et al. Catalytic preparation of α-silicon nitride single-crystalline nanowires by layered double hydroxides[J]. CIESC Journal, 2018, (10): 4471-4478. DOI： 10.11949/j.issn.0438-1157.20180760.

摘要

提出了一种以LDH （水滑石类化合物）为催化剂，纳米硅粉为原料，在N2-H2混合气氛下制备单晶a-Si3N4纳米线的CVD （化学气相沉积）方法。研究结果表明：当H2含量小于0.5%时，所制备的Fe/Mg/Al LDH催化剂具有优良的高温热稳定性，在1250℃下煅烧与还原后仍可保持自身结构完整与催化活性。通过降低还原温度与LDH中Fe含量、在LDH中引入Mo元素等手段，有效地降低金属Fe纳米晶粒直径、增大成核密度，所制备单晶a-Si3N4纳米线面密度可达5×1014～9×1014 m-2，直径为30～50 nm，长度达20～80 μm （长径比>1000）。进一步研究表明本实验中纳米线为VLS （气液固）生长机制。

Abstract

α-Silicon nitride single-crystalline nanowires were prepared by direct nitridation of nano-Si powders in N2-H2 mixture gas under the catalysis of layered double hydroxide (LDH) flakes. The results show that when the H2 content is less than 0.5%

the as-prepared Fe/Mg/Al LDH catalyst has excellent high temperature thermal stability

and can maintain its structural integrity and catalytic activity after calcination and reduction at 1250℃. Through decreasing the size and increasing the density of nano Fe particles on LDHs

via reducing the temperature

Fe content in LDHs and adding Mo element into LDHs

the diameter of as prepared a-Si3N4 nanowires can be decreased to 30-50 nm

with the aspect ratio higher than 1000. Further study shows that the growth of nanowires was controlled by the vapor-liquid-solid (VLS) mechanism.

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Related Institution

Key Laboratory for Ultrafine Materials of Ministry of Education, School of Material Science and Engineering,East China University of Science and Technology

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