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.
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.
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.