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Synthesis and Characterization of TiC Nanofibers Obtained via a Modified Carbothermal Process
Crystal Research and Technology ( IF 1.5 ) Pub Date : 2021-06-07 , DOI: 10.1002/crat.202000231 Chung‐Ying Tsai 1 , Kanchan Mondal 2
Crystal Research and Technology ( IF 1.5 ) Pub Date : 2021-06-07 , DOI: 10.1002/crat.202000231 Chung‐Ying Tsai 1 , Kanchan Mondal 2
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A simple method for synthesis of titanium carbide (TiC) nanofibers by a modified carbothermal reduction of electrospun titanium-based fibers is reported. The effect of synthesis steps on the final product is discussed. Continuous TiC fibers synthesized have a smooth surface morphology, with average diameter of 148 nm and length in the centimeter range. X-ray diffraction and high-resolution transmission electron microscopy analysis results indicate that the fibers consist of TiC of high purity. Impact of heat treatment on the morphology and chemical and crystalline composition of the product is also investigated. Based on the experimental evidence, it is hypothesized that the carbothermal reduction of calcined electrospun fibers with precoated carbon proceeds through diffusion-limited shrinking core pathway while that of the as-spun fibers follows the reaction-limited solution precipitation mechanism. The TiC nanofibers also show superior sintering properties by increasing theoretical density of hot pressed TiB2 from 94.5% of theoretical density to 97.9% of theoretical density. When sintered with ceria, it improves the conductivity of the ceria by 18.29 times as compared to 2.94 times by TiC nanoparticles at 800 °C. The TiC nanofibers show metallic behavior as well as potential for application as electrochemical double layer capacitor supercapacitors.
中文翻译：
通过改进的碳热工艺获得的 TiC 纳米纤维的合成和表征
报道了一种通过电纺钛基纤维的改性碳热还原合成碳化钛 (TiC) 纳米纤维的简单方法。讨论了合成步骤对最终产品的影响。合成的连续 TiC 纤维具有光滑的表面形态，平均直径为 148 nm，长度在厘米范围内。X 射线衍射和高分辨率透射电子显微镜分析结果表明纤维由高纯度的 TiC 组成。还研究了热处理对产品形态、化学和结晶组成的影响。根据实验证据，假设具有预涂层碳的煅烧电纺纤维的碳热还原通过扩散限制的收缩核心途径进行，而初纺纤维的碳热还原遵循反应限制的溶液沉淀机制。通过增加热压 TiB 的理论密度，TiC 纳米纤维还显示出优异的烧结性能2从理论密度的 94.5% 到理论密度的 97.9%。在 800 °C 下，与氧化铈烧结时，氧化铈的导电性提高了 18.29 倍，而 TiC 纳米颗粒的导电性提高了 2.94 倍。TiC 纳米纤维显示出金属行为以及作为电化学双层电容器超级电容器的应用潜力。
更新日期：2021-08-15
中文翻译：
通过改进的碳热工艺获得的 TiC 纳米纤维的合成和表征
报道了一种通过电纺钛基纤维的改性碳热还原合成碳化钛 (TiC) 纳米纤维的简单方法。讨论了合成步骤对最终产品的影响。合成的连续 TiC 纤维具有光滑的表面形态，平均直径为 148 nm，长度在厘米范围内。X 射线衍射和高分辨率透射电子显微镜分析结果表明纤维由高纯度的 TiC 组成。还研究了热处理对产品形态、化学和结晶组成的影响。根据实验证据，假设具有预涂层碳的煅烧电纺纤维的碳热还原通过扩散限制的收缩核心途径进行，而初纺纤维的碳热还原遵循反应限制的溶液沉淀机制。通过增加热压 TiB 的理论密度，TiC 纳米纤维还显示出优异的烧结性能2从理论密度的 94.5% 到理论密度的 97.9%。在 800 °C 下，与氧化铈烧结时，氧化铈的导电性提高了 18.29 倍，而 TiC 纳米颗粒的导电性提高了 2.94 倍。TiC 纳米纤维显示出金属行为以及作为电化学双层电容器超级电容器的应用潜力。
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