Oxidation and Opening of Well-Aligned Carbon Nanotube Tips

Zhang, Xianfeng; Cao, Anyuan; Sun, Qunhui; Xu, Chao; Wu, Dehai

doi:10.2320/matertrans.43.1707

Cited by 11 publications

(2 citation statements)

References 20 publications

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“…The oxidation of nanotubes has been of interest for the purposes of characterization and oxidative purification of raw CNT, − cap removal and subsequent nanotube filling for nanowire fabrication, ,− and for removal of CNT templates used in fabrication of other structures . Various oxidizers have been examined in previous studies, including oxidation by acids, other oxides, , and air, gaseous oxygen, or ozone, ,,, with the objective of modeling nanotube oxidation chemistry.…”

Section: Introductionmentioning

confidence: 99%

Thermogravimetric Analysis of Synthesis Variation Effects on CVD Generated Multiwalled Carbon Nanotubes

2005

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Changes in the thermogravimetrically determined oxidation behaviors of CVD-grown multiwalled carbon nanotubes with varying synthesis conditions are examined. Catalyst type and synthesis temperature are found to have a measurable impact upon nanotube stability, suggesting differing levels of crystalline perfection in the resulting nanotubes. The results provide evidence showing the catalytic effects of nanotube catalyst particles and their oxides upon the oxidation of nanotube carbon and graphite. The significance of thermogravimetric analysis as a characterization tool for carbon nanotubes is discussed.

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Section: Introductionmentioning

confidence: 99%

Thermogravimetric Analysis of Synthesis Variation Effects on CVD Generated Multiwalled Carbon Nanotubes

2005

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“…Opening the end caps of CNTs and filling the inner space of CNTs has been studied computationally − and experimentally . Methods for opening the holes on both single-walled carbon nanotubes (SWCNTs) and multi-walled carbon nanotubes (MWCNTs) by heating in oxygen, , carbon dioxide, , KOH, − and NaOH and by treating in acids have been reported. These different treatments result in creating defects, such as functional groups and holes.…”

Section: Introductionmentioning

confidence: 99%

Hole Opening of Carbon Nanotubes and Their Capacitor Performance

et al. 2010

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Pore structures and electrochemical performances of mass-produced metal-free single-walled carbon nanotubes (mf-SWCNTs) heated in either CO 2 gas or dry air were investigated. Pore structures, defects, and electrochemical performances of mf-SWCNTs were analyzed mainly using the N 2 adsorption method, apparent density measurement, Raman spectroscopy, and cyclic voltammogram. mf-SWCNT sheets heated in CO 2 gas showed a remarkable increase of the specific surface area up to 1900 m 2 g -1 , but sheets heated in air showed an increase of only up to 1400 m 2 g -1 . Propan-2-ol, 4-methyl-1,3-dioxolan-2-one, or ionic liquid was impregnated in the inner space of mf-SWCNTs to confirm whether the inner space of mf-SWCNTs is filled with each liquid. mf-SWCNTs heated in air were completely filled, but mf-SWCNTs heated in CO 2 were partially filled. From these results, it is estimated that holes of the size of 0.56 nm or larger are opened on the side wall of mf-SWCNTs. A combination of two heat treatments maximized the effective specific capacitance of heated mf-SWCNTs up to 100 F g -1 , which is 1.6 times higher than that of as-grown mf-SWCNTs because of the removal of the carboneous component and the creation of defects on the sidewall of mf-SWCNTs, which allow the electrolyte into the inner space of mf-SWCNTs.

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