High yield purification of carbon nanotubes with H2S-O2 mixture |
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Authors: | Tak Jeong Tae Hee Kim Wan-Young Kim Kuk-Haeng Lee Yoon-Bong Hahn |
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Affiliation: | (1) School of Chemical Engineering and Technology, Semiconductor Physics Research Center, Chonbuk National University, 561-756 Chonju, Korea;(2) School of Science and Technology, Chonbuk National University, 561-756 Chonju, Korea;(3) Present address: LG Innotek, 78-1 Jangduk-dong, Kwangsan-gu, 506-251 Kwangju, Korea |
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Abstract: | Abatract A high yield purification method was developed for multi- and single-walled carbon nanotubes, combining both the gas-phase
purification using H2S and O2 mixture to remove impurity carbon particles and the acid treatment to remove metal particles. For the purification of MWNTs,
the purification yield was about 54%, much higher than the yield previously reported. For the SWNTs, the combined liquid-gas
purification process resulted in a high purity of >95% and a high yield of 20–50%, depending on the quality of raw material.
Hydrogen sulfide played a role of enhancing the removal of carbon particles as well as suppressing the oxidation of carbon
nanotubes. Overall, the purification method developed in this work is simple and quite effective for removing unwanted carbon
and metal particles out of MWNTs and SWNTs. |
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Keywords: | Carbon Nanotubes High Yield Purification H2S-O2 |
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