Modifications of single-wall carbon nanotubes upon oxidative purification treatments

被引:96
作者
Martínez, MT
Callejas, MA
Benito, AM
Cochet, M
Seeger, T
Ansón, A
Schreiber, J
Gordon, C
Marhic, C
Chauvet, O
Maser, WK
机构
[1] CSIC, Inst Carboquim, Zaragoza 50018, Spain
[2] Inst Mat Jean Rouxel, F-44322 Nantes 3, France
关键词
D O I
10.1088/0957-4484/14/7/301
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
A systematic characterization of single-wall carbon nanotube (SWCNT) material after successive purification steps, including reflux treatment with nitric acid, air oxidation, and annealing, has been performed. Inductively coupled plasma-optical emission spectroscopy shows that a considerable reduction of the metal impurities by up to 95% can be obtained by the nitric acid reflux treatment. During this process, Raman spectroscopy clearly proves that HNO3 molecules are intercalated into the bundles of SWCNTs. At the same time, SWCNTs have suffered a high degree of degradation and defects are being introduced. The subsequent thermal processes lead to the removal of further defect carbon materials and to the almost complete de-intercalation of the HNO3 molecules. Transmission electron microscopy reveals that the remaining SWCNT bundles tend to form thick bundles. Thus the applied purification process results in a high-purity SWCNT material with a drastically reduced content of metal nanoparticles and composed of large bundles of SWCNTs.
引用
收藏
页码:691 / 695
页数:5
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