Thermochemistry and growth mechanism of TiC nanowires synthesized by carbothermal reduction
Thermochemistry and growth mechanism of TiC nanowires synthesized by carbothermal reduction
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碳热还原合成TiC纳米线的热化学及生长机理
DOI：
10.1080/24701556.2020.1716006
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发表时间：
--
影响因子：
1.7
通讯作者：
Jianjun Chen
中科院分区：
文献类型：
--
作者：
Xiaochun Xie;Guosong Ou;Hongquan Men;Min Jiang;Wenxin Lin;Jianjun Chen
在1473 ~ 1673 K的氩气气氛中，采用碳热还原反应合成了碳化钛纳米线。采用x射线衍射（XRD）和场发射扫描电镜（FE-SEM）对TiC纳米线的结构和形貌进行了表征。在Ti-C-O-Cl体系中研究了TiC纳米线的化学反应热力学和生长机理。它包括气态TiClx和CO的形成，以及TiClx进一步的碳还原成TiC。基于热力学分析，讨论了TiC纳米线的两阶段生长机理。本研究有助于分析Ti-C-O-Cl体系中碳热还原反应的热化学性质，有利于优化温度和输入前驱体来控制TiC纳米线的生长。
Titanium carbide (TiC) nanowires are synthesized by carbothermal reduction reaction at 1473–1673 K in argon atmosphere. The structure and morphology of TiC nanowires are characterized by X-ray diffraction (XRD) and field emission scanning electron microscopy (FE-SEM). The chemical reaction thermodynamics and the growth mechanism of TiC nanowires are investigated based on the Ti-C-O-Cl system. It involves the formation of gaseous TiClx and CO crucial intermediates, and the further carbon reduction of TiClx to TiC. Based on the thermodynamic analysis, the two-stage growth mechanism of TiC nanowires is discussed. The work could help to analyze the thermochemistry of the carbothermal reduction reaction in the Ti-C-O-Cl system, which is beneficial to optimize the temperature and the input precursors for controlling TiC nanowires growth.