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The role of steam treatment on the structure, purity and length distribution of multi-walled carbon nanotubes
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| Abstract |
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| Purification and shortening of carbon nanotubes have attracted a great deal of attention to increase the biocompatibility and performance of the material in several applications. Steam treatment has been employed to afford both purification and shortening of multi-walled carbon nanotubes (MWCNTs). Steam removes the amorphous carbon and the graphitic particles that sheath catalytic nanoparticles, facilitating their removal by a subsequent acidic wash. The amount of metal impurities can be reduced in this manner below 0.01 wt.%. The length distribution of MWCNTs after different steam treatment times (from 1 h to 15 h) was assessed by box plot analysis of the electron microscopy data. Samples with a median length of 0.57 μm have been prepared with the reported methodology while preserving the integrity of the tubular wall structure. | |
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English
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| Source (journal) |
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Carbon. - Oxford |
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Oxford : 2015
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0008-6223
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93(2015), p. 1059-1067
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| ISI |
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000360292100108
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| Full text (open access) |
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