Complete elimination of metal catalysts from single wall carbon nanotubes

被引：72
作者：
Chattopadhyay, D [1 ]
Galeska, I [1 ]
Papadimitrakopoulos, F [1 ]
机构：
[1] Univ Connecticut, Inst Mat Sci, Dept Chem, Polymer Program,Nanomat Optoelect Lab, Storrs, CT 06269 USA
来源：
CARBON | 2002年 / 40卷 / 07期
基金：
美国国家卫生研究院;
关键词：
carbon nanotubes; annealing; catalyst; etching; oxidation; Raman spectroscopy; X-ray scattering;
D O I：
10.1016/S0008-6223(01)00234-2
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 complete removal of entrapped metallic impurities (i.e. Ni and Cc) incorporated within single wall carbon nanotubes (SWNTs) has been a long-standing issue. A sonication-mediated treatment of as-obtained SWNT soot in a 1: 1 mixture of aqueous hydrofluoric and nitric acids resulted in the complete elimination of these impurities as shown by energy dispersive X-ray analysis (EDAX). Contact angle measurements indicated that the wetting of SWNTs is enhanced in the presence of HE The presence of HNO3 and surfactant was found essential in removing the catalyst due to SWNT etching of end-caps/defects and providing better dispersion, respectively. Moreover, Raman spectroscopy indicated that the structural purity of the SWNTs is not compromised by the HF/HNO3 purification treatment. (C) 2002 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码：985 / 988
页数：4
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