Carbon materials syntheses using dielectric barrier discharge microplasma in supercritical carbon dioxide environments
Carbon materials syntheses using dielectric barrier discharge microplasma in supercritical carbon dioxide environments
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DOI：
10.1016/j.supflu.2006.12.003
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发表时间：
2007-07-01
影响因子：
3.9
通讯作者：
Terashima, Kazuo
中科院分区：
文献类型：
--
作者：
Tomai, Takaaki;Katahira, Ken;Terashima, Kazuo
本文报道了在超临界二氧化碳（scCO(2)）环境下，利用介质阻挡放电（DBD）微等离子体合成碳材料。考察了环境温度、环境压力和工频对碳材料合成工艺的影响。与常压CO环境下无法制备碳材料不同，利用scCO(2)作为加工介质和原料，可以制备各种碳材料，如无定形碳、石墨和纳米结构碳材料。特别是在CO2临界点附近，碳纳米结构材料（如碳纳米管和碳纳米角）的数量比其他scCO(2)条件下要大。推测超临界条件下的高密度和分子聚集可能会影响这种碳纳米结构材料的形成。此外，我们发现通过改变电源频率，可以改变合成的碳材料的形态。(C) 2006 Elsevier B.V.版权所有
In this study, carbon materials syntheses using a dielectric barrier discharge (DBD) microplasma in supercritical carbon dioxide (scCO(2)) environments are reported. The dependencies of the carbon materials synthesis processing on the environmental temperature, environmental pressure and power frequency were investigated. In contrast to atmospheric-pressure CO, environments, in which no carbon materials could be fabricated, it was possible to fabricate various carbon materials, such as amorphous carbon, graphite and nanostructured carbon materials, using scCO(2) as a processing medium and a raw starting material. In particular, in the vicinity of the critical point of CO2, the quantity of carbon nanostructured materials, such as carbon nanotubes and carbon nanohorns, was larger than under other scCO(2) conditions. It is supposed that the high density and molecular clustering caused by supercritical conditions may affect the formation of such carbon nanostructured materials. In addition, we found that by varying the power frequency, the form of the synthesized carbon materials could be changed. (C) 2006 Elsevier B.V. All rights reserved.