Comparative XRD, Raman, and TEM Study on Graphitization of PBO-Derived Carbon Fibers
Comparative XRD, Raman, and TEM Study on Graphitization of PBO-Derived Carbon Fibers
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DOI：
10.1021/jp2084499
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发表时间：
2012-01-12
影响因子：
3.7
通讯作者：
Tascon, Juan M. D.
中科院分区：
文献类型：
--
作者：
Beatriz Vazquez-Santos, M.;Geissler, Erik;Tascon, Juan M. D.
碳纤维是通过在 900 摄氏度下碳化聚对亚苯基苯并二恶唑 (PBO) 纤维而获得的，在较高温度（2700 摄氏度）下进行热处理后会广泛石墨化。在这项工作中，使用 XRD、拉曼光谱和 HRTEM 来监测碳材料在 900-2800 摄氏度之间的多个温度下进行热处理时的结构和纳米结构转变。这些不同的技术提供了补充信息，特别是关于它们实现的空间分辨率。他们强调了这种意想不到的可石墨化前体的特定非传统石墨化模式。对这三种技术测定 L-a 微晶尺寸的可靠性进行了比较和讨论。推断 PBO 衍生碳纤维的石墨化存在四个步骤。
Carbon fibers, obtained by carbonizing poly(p-phenylene benzobisoxazole) (PBO) fibers at 900 degrees C, graphitize extensively upon heat treatment at higher temperatures (2700 degrees C). In this work, XRD, Raman spectroscopy, and HRTEM are used to monitor the structural and nanostructural transformations of the carbon material under heat-treatment at several temperatures in the interval 900-2800 degrees C. These different techniques provide complementary information, especially regarding the spatial resolution they achieve. They highlight a specific nonconventional mode of graphitization for this unexpectedly graphitizable precursor. The reliability in the determination of L-a crystallite sizes from these three techniques is compared and discussed. The existence of four steps in the graphitization of PBO-derived carbon fibers is inferred.