Oxidation of multiwalled carbon nanotubes by nitric acid

被引：690

作者：

Rosca, ID

Watari, F

Uo, M

Akaska, T

机构：

[1] Polytech Univ Bucharest, Fac Ind Chem, Dept Polymer Sci, Bucharest 010072, Romania

[2] Hokkaido Univ, Grad Sch Dent Med, Kita Ku, Sapporo, Hokkaido 0608586, Japan

来源：

CARBON | 2005年 / 43卷 / 15期

关键词：

carbon nanotubes; oxidation; Raman spectroscopy; optical microscopy; scanning electron microscopy;

D O I：

10.1016/j.carbon.2005.06.019

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The oxidation of MWCNTs in nitric acid was monitored using sample weight, Raman spectrum. solubility. morphology and alignment. The influence of the acid concentration, temperature and oxidation duration on the monitored parameters was assessed. A new method, based on optical microscopy is proposed for the determination of MWCNT solubility in concentrated aqueous-suspensions. The investigations revealed that the Solubility is determined not only by the functional groups on the MWCNT, but also by the functionalized amorphous carbon generated during the digestion of the nanotubes, High solubility (20-40 mg/ml) is obtained only after prolonged exposure (24-48 h) in concentrated acid (>= 60%). But in these conditions 60-90% of the MWCNTs are lost. Furthermore the MWCNTs are strongly fragmented and covered by amorphous carbon after 48 h of oxidation. It was found that the solubility correlates well with the area ratio of the G and D bands from tile Raman spectrum, SEM examination of the MWCNT films showed extended alignment after 24 h of oxidation. (C) 2005 Elsevier Ltd. All rights reserved.

引用

页码：3124 / 3131

页数：8

共 17 条

[1] OPENING CARBON NANOTUBES WITH OXYGEN AND IMPLICATIONS FOR FILLING [J].