Characterisation of carbonaceous materials using Raman spectroscopy: a comparison of carbon nanotube filters, single- and multi-walled nanotubes, graphitised porous carbon and graphite
Characterisation of carbonaceous materials using Raman spectroscopy: a comparison of carbon nanotube filters, single- and multi-walled nanotubes, graphitised porous carbon and graphite
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DOI：
10.1002/jrs.2120
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发表时间：
2009-03-01
影响因子：
2.5
通讯作者：
Asthana, B. P.
中科院分区：
文献类型：
--
作者：
Heise, H. M.;Kuckuk, R.;Asthana, B. P.
多壁碳纳米管（MWCNT）过滤器最近已经合成，其具有特定的分子过滤能力和良好的机械强度。光学和扫描电子显微镜（SEM）揭示了高度对齐的长度高达500 μ m的碳纳米管束阵列的形成。这种材料沿着其他四种碳质材料，市售的单壁碳纳米管（SWCNT）和多壁碳纳米管，石墨化多孔碳（Carbotrap）和石墨的拉曼光谱已被记录使用两个激发波长，532和785 nm，并分析了带的位置和形状，特别强调D-，G-和G '-带。分析的不同MWCNT品种之间的一个主要差异是，在MWCNT过滤器中的G-波段几乎没有表现出分散，而其他MWCNT显示出显着的分散行为与激发波长的变化。对于Carbotrap材料，观察到与MWCNT过滤器品种相似的光谱特征。根据线形分析，使用积分G带的更有序的MWCNT过滤材料的强度比I-D/I-G在两个激发波长下都比较不有序的MWCNT过滤产品的强度比低两倍。因此，该参数可以用作过滤器品种中多壁碳纳米管对齐程度的度量，这也得到了我们的SEM研究的很好支持。版权所有（C）2008约翰威利父子有限公司
Multi-walled carbon nanotube(MWCNT) filters have been recently synthesised which have specific molecular filtering capabilities and good mechanical strength. Optical and scanning electron microscopy (SEM) reveals the formation of highly aligned arrays of bundles of carbon nanotubes having lengths up to 500 mu m. The Raman spectra of this material along with four other carbonaceous materials, commercially available single-walled carbon nanotubes (SWCNTs) and MWCNTs, graphitised porous carbon (Carbotrap) and graphite have been recorded using two-excitation wavelengths, 532 and 785 nm, and analysed for band positions and shape with special emphasis paid to the D-, G- and G'-bands. A major difference between the different MWCNT varieties analysed is that G-bands in the MWCNT filters exhibit almost no dispersion, whereas the other MWCNTs show a noticeable dispersive behaviour with a change in the excitation wavelength. Spectral features similar to those of the MWCNT filter varieties were observed for the Carbotrap material. From the line shape analysis, the intensity ratio, I-D/I-G, of the more ordered MWCNT filter material using the integral G-band turns out to be two times lower than that of the less ordered MWCNT filter product at both excitation wavelengths. This parameter can, therefore, be used as a measure of the degree of MWCNT alignment in filter varieties, which is well supported also by our SEM study. Copyright (C) 2008 John Wiley & Sons, Ltd.