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Rapid Acid-Mediated Purification of Single-Walled Carbon Nanotubes with Homogenization of Bulk Properties
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2007
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EngineeringBulk PropertiesChemistrySingle-walled Carbon NanotubesChemical EngineeringCarbon-based MaterialAcid-treated SwntsPurification MethodCarbon NanotubesNanoparticle CharacterizationNanotechnologyNano ApplicationRapid Acid-mediated PurificationCarbonizationNanomaterialsNanoreactorReflux TemperatureActivated CarbonSingle-walled NanotubesNanotubes
A rapid, mild and readily scaleable method for purification and isolation of single-walled nanotubes (SWNTs) using aqueous nitric acid that, in only 1-2 hours at reflux temperature, not only decrease the content of residual metal particles but also the relative ratio of small diameter and metallic NTs. The acid-treated SWNTs have been characterised by TEM, FT-IR, and Raman spectroscopy (514 and 783 cm(-1)). The results are discussed in relation to observations from other acid-mediated treatments and the reactive chemical species involved at different conditions.