通过温度调制实现SiC/SiO₂异质结的可调合成

Tunable Synthesis of SiC/SiO₂ Heterojunctions via Temperature Modulation.

作者信息

Li Wei, Jia Quanli, Yang Daoyuan, Liu Xinhong

机构信息

Henan Key Laboratory of High Temperature Functional Ceramics, Zhengzhou University, 75 Daxue Road, Zhengzhou 450052, China.

School of Materials Science and Engineering, Zhengzhou University, 100 Kexue Road, Zhengzhou 450000, China.

出版信息

Materials (Basel). 2018 May 10;11(5):766. doi: 10.3390/ma11050766.

DOI:10.3390/ma11050766

PMID:29748482

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5978143/

Abstract

A large-scale production of necklace-like SiC/SiO₂ heterojunctions was obtained by a molten salt-mediated chemical vapor reaction technique without a metallic catalyst or flowing gas. The effect of the firing temperature on the evolution of the phase composition, microstructure, and morphology of the SiC/SiO₂ heterojunctions was studied. The necklace-like SiC/SiO₂ nanochains, several centimeters in length, were composed of SiC/SiO₂ core-shell chains and amorphous SiO₂ beans. The morphologies of the as-prepared products could be tuned by adjusting the firing temperature. In fact, the diameter of the SiO₂ beans decreased, whereas the diameter of the SiC fibers and the thickness of the SiO₂ shell increased as the temperature increased. The growth mechanism of the necklace-like structure was controlled by the vapor-solid growth procedure and the modulation procedure via a molten salt-mediated chemical vapor reaction process.

摘要

通过无金属催化剂或流动气体的熔盐介导化学气相反应技术实现了项链状SiC/SiO₂异质结的大规模生产。研究了焙烧温度对SiC/SiO₂异质结相组成、微观结构和形貌演变的影响。长度达几厘米的项链状SiC/SiO₂纳米链由SiC/SiO₂核壳链和非晶态SiO₂珠组成。通过调节焙烧温度可以调整所制备产物的形貌。实际上，随着温度升高，SiO₂珠的直径减小，而SiC纤维的直径和SiO₂壳的厚度增加。项链状结构的生长机制由气固生长过程和通过熔盐介导化学气相反应过程的调制过程控制。