Journal
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
Volume 40, Issue 7, Pages 2322-2326Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physe.2007.09.087
Keywords
multi-wall carbon nanotubes; treatment with acids; field emission
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Highly pure multi-wall carbon nanotubes (MWNTs) were successfully fabricated using an acidic purification process. Treatment with acids, concentrated sulfuric acid (H2SO4) and nitric acid (HNO3) eliminated many of the metal catalysts and impurities from MWNTs. The concentration of H2SO4/HNO3 solution and the purification time were optimized. Experimental data demonstrate that a 1:3 concentrated H2SO4:HNO3 solution after 20 h yields highly pure MWNTs. MWNTs were closed tips that are opened after purification. The intensity ratio of the D band to the G band (ID/IG) is as low as 0.27. The field emission current density is as high as 170 mu A/cm(2) at an electric field of 1.9 V/mu m. (C) 2007 Elsevier B.V. All rights reserved.
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