Raman spectroscopy of graphitic foams
Raman spectroscopy of graphitic foams
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DOI：
10.1103/physrevb.71.165422
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发表时间：
2005-04-01
影响因子：
3.7
通讯作者：
Dresselhaus, MS
中科院分区：
文献类型：
--
作者：
Barros, EB;Demir, NS;Dresselhaus, MS
最近开发的沥青基石墨泡沫具有非常高的热导率重量比。这种特性使得石墨泡沫可以用于多种热管理应用，特别是航空和航天工业。拉曼光谱研究进行了不同的结构区域的泡沫，产生重要的信息的石墨泡沫的结构特性，以及石墨的物理性能。石墨泡沫被发现是由两个相互混合的石墨结构，一个具有堆叠的平面和一个具有乱层结构。这种特殊的结构允许同时研究二维（2D）和三维（3D）石墨结构的性质。发现G（′）带的色散对于2D和3D石墨是不同的。D带拉曼特征的强度用于探测结构中的缺陷密度，从而得出缺陷主要局限于2D结构中的结论。提出了一个简单的模型来解释石墨泡沫内的两种不同结构的起源。此外，G'带的偏振的依赖性被解决。
The recently developed pitch-based graphitic foams have a very high thermal conductivity to weight ratio. This property allows graphitic foams to be used in several thermal management applications, especially in the aeronautics and aerospace industries. Raman spectroscopy studies were performed on the different structural regions of the foam, yelding important information on the structural properties of the graphitic foams, as well as on the physical properties of graphite. The graphitic foam was found to be composed of two intermixed graphitic structures, one with stacked planes and one with a turbostratic structure. This special structure allowed for a simultaneous study of the properties of two-dimensional (2D) and three-dimensional (3D) graphitic structures. The dispersion of the G(') band was found to be different for 2D and 3D graphite. The intensity of the D-band Raman feature was used to probe the density of defects in the structure, leading to the conclusion that the defects are mainly localized in the 2D structures. A simple model is proposed to explain the origin of the two different structures within the graphitic foam. Also, the dependence of the G' band on polarization is addressed.