Abstract
Oxidation of N-doped multiwalled carbon nanotubes and formation of discontinuous spiraled carbon nanoribbons
Highlights
Since their discovery,[1,2,3] carbon nanotubes (CNTs) have presented unparalleled potential because of their combination of extraordinary mechanical, electrical, and thermal properties.[4,5,6,7] With appropriate surface modifications of CNTs, these properties can be harnessed in a variety of applications.[8,9,10,11] far, covalent and non-covalent functionalizations[12,13] have been widely investigated approaches to modify these materials
These results showed that upon oxidation of G-N-multi-walled carbon nanotubes (MWCNTs) with a mixture of H2SO4/HNO3, the surface area increased from 34 m2/g to 63 m2/g which was lower than what we have observed for samples treated under reducing conditions.[34,35]
We believe that oxidation/intercalation pushes apart segments of the N-MWCNT structure and exposes the underlying morphology, and that the underlying morphology is most likely not a set of stacked cups
Summary
Since their discovery,[1,2,3] carbon nanotubes (CNTs) have presented unparalleled potential because of their combination of extraordinary mechanical, electrical, and thermal properties.[4,5,6,7] With appropriate surface modifications of CNTs, these properties can be harnessed in a variety of applications.[8,9,10,11] far, covalent and non-covalent functionalizations[12,13] have been widely investigated approaches to modify these materials. Despite the availability of variety of oxidizing approaches for the modification of SWCNTs and MWCNTs, the mechanism of action of these reagents on different nanotube sites is rarely discussed.[18,24] Zhang et al.[18] proposed that the original or newly created defects on CNTs play a crucial role during the oxidation process. With this idea they explored oxidation reactions under different conditions and predicted intermediates and final products based upon their observation and analysis. The resulting oxidized N-MWCNTs were characterized using thermogravimetric analysis and electron microscopy
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