Surface and structural characterization of multi-walled carbon nanotubes following different oxidative treatments

被引:613
作者
Wepasnick, Kevin A. [1 ]
Smith, Billy A. [1 ]
Schrote, Kaitlin E. [2 ]
Wilson, Hannah K. [3 ]
Diegelmann, Stephen R. [1 ,4 ]
Fairbrother, D. Howard [1 ,4 ,5 ]
机构
[1] Johns Hopkins Univ, Dept Chem, Baltimore, MD 21218 USA
[2] Coll Notre Dame Maryland, Dept Chem, Baltimore, MD 21210 USA
[3] Univ Maryland, Dept Chem & Biochem Engn, Baltimore, MD 21250 USA
[4] Johns Hopkins Univ, Inst NanoBioTechnol, Baltimore, MD 21218 USA
[5] Johns Hopkins Univ, Dept Mat Sci & Engn, Baltimore, MD 21218 USA
基金
美国国家科学基金会;
关键词
CONTAINING FUNCTIONALITIES; AQUEOUS SUSPENSIONS; COLLOIDAL STABILITY; CARBOXYLIC-ACID; RAMAN; NANOPARTICLES; PURIFICATION; OXIDES; OZONE; QUANTIFICATION;
D O I
10.1016/j.carbon.2010.08.034
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
Six commonly used wet chemical oxidants (HNO3, KMnO4, H2SO4/HNO3, (NH4)(2)S2O8, H2O2, and O-3) were evaluated in terms of their effects on the surface chemistry and structure of MWCNTs using a combination of analytical techniques X ray photoelectron spectroscopy (XPS) and energy dispersive spectroscopy (EDX) were used to characterize the extent of surface oxidation, while chemical derivatization techniques used in conjunction with XPS allowed the concentration of carboxyl, carbonyl, and hydroxyl groups at the surface to be quantified for each MWCNT sample Our results indicate that the distribution of oxygen containing functional groups was insensitive to the reaction conditions (e g, w/w% of oxidant), but was sensitive to the identity of the oxidant MWCNTs treated with (NH4)(2)S2O8, H2O2 and O-3 yielded higher concentrations of carbonyl and hydroxyl functional groups, while more aggressive oxidants (e g, HNO3, KMnO4) formed higher fractional concentrations of carboxyl groups IR spectroscopy was unable to identify oxygen-containing functional groups present on MWCNTs, while Raman spectra highlighted the frequently ambiguous nature of this technique for measuring CNT structural integrity TEM was able to provide detailed structural information on oxidized MWCNT, including the extent of sidewall damage for different oxidative treatments (C) 2010 Elsevier Ltd All rights reserved
引用
收藏
页码:24 / 36
页数:13
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