On the 2H- to 3C-Type Transformation and Growth Mechanism of SiC Nanowires upon Carbothermal Reduction of Rice Straws.

ABSTRACT: SiC nanowires (NWs) and nanoparticles (NPs) fabricated by carbothermal reduction of rice straws with/without FeSi catalysts were characterized by transmission electron microscopy to study the catalyst-facilitated vapor-liquid-solid (VLS) growth against the oriented attachment of the crystals, which underwent 2H- to 3C-type transformation. The cotectic melt of the FeSi catalyst in the Fe-Si-C-O system turned out to promote the VLS growth to form straight and occasionally tapered NWs in contrast to the zigzag ones via the (hkl)-specific coalescence of the faceted NPs. The SiC NWs showed [0001]_2H-directed growth more or less stacked with {111}_3C interlayers following the optimum crystallographic relationship (0001)_2H//{111̅}_3C; [21̅1̅0]₂

SUBMITTER: Huang CN 

PROVIDER: S-EPMC8851617 | biostudies-literature | 2022 Feb

REPOSITORIES: biostudies-literature