Journal
JOURNAL OF PHYSICAL CHEMISTRY B
Volume 106, Issue 29, Pages 7160-7162Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp015600e
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Herein we reported a simple way to enrich the large-diameter single-walled carbon nanotubes (SWNTs) by using a mixed concentrated H2SO4/HNO3 treatment. The proportion of the SWNTs with diameter larger than 2 nm measured from transmission electron microscopy was only ca. 3% in the original sample prepared by chemical vapor deposition method. It is found that this proportion becomes remarkably increased with treatment time and reached ca. 20% after 96 h of acid treatment.
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