Gas adsorption studies of CO2 and N2 in spatially aligned double-walled carbon nanotube arrays
Gas adsorption studies of CO2 and N2 in spatially aligned double-walled carbon nanotube arrays
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DOI：
10.1016/j.carbon.2013.05.045
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发表时间：
2013-09-01
期刊：
影响因子：
10.9
通讯作者：
Schneider, Joerg J.
中科院分区：
文献类型：
--
作者：
Babu, Deepu J.;Lange, Marcus;Schneider, Joerg J.
报道了在宽压力范围内对高纯度和高比表面积的垂直、高度排列的致密双壁碳纳米管阵列的气体吸附研究（CO2和N2-）。在高压下，这些材料的吸附能力被发现是可比的金属有机框架和介孔分子筛。这些高度对齐的CNT阵列通过用氧等离子体处理进行化学改性，并通过减小单个碳纳米管的直径进行结构改性。氧等离子体处理导致大量的C-O官能团接枝到CNT表面上，这进一步增加了气体吸附能力。结果发现，气体吸附是依赖于管直径和增加的CNT束中的单个CNT直径的减小。作为我们研究的结果，我们已经发现，在较低的压力制度下，等离子体官能化的碳纳米管表现出更好的吸附特性，而在较高的压力下，较低直径的碳纳米管结构表现出更好的气体吸附特性。(C)2013爱思唯尔有限公司保留所有权利。
Gas adsorption studies (CO2 and N-2) over a wide pressure range on vertically, highly aligned dense double-walled carbon nanotube arrays of high purity and high specific surface area are reported. At high pressures, the adsorption capacity of these materials was found to be comparable to those of metal organic frameworks and mesoporous molecular sieves. These highly aligned CNT arrays were chemically modified by treating with oxygen plasma and structurally modified by decreasing the diameter of individual carbon nanotubes. Oxygen plasma treatment led to grafting of a large number of C-O functional groups onto, the CNT surface, which further increased the gas adsorption capacity. It was found that gas adsorption is dependent on tube diameter and increases with decrease of the individual CNT diameter in the CNT bundles. As results of our studies we have found that at lower pressure regimes, plasma functionalized carbon nanotubes exhibit better adsorption characteristics whereas at higher pressures, lower diameter carbon nanotube structures exhibited better gas adsorption characteristics. (C) 2013 Elsevier Ltd. All rights reserved.