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|e rakwb
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|a eng
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| 100 |
1 |
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|a Xing, Yangchuan
|e verfasserin
|4 aut
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| 245 |
1 |
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|a Sonochemical oxidation of multiwalled carbon nanotubes
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|c 2005
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|a Text
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|a Date Completed 28.07.2006
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|a Date Revised 21.11.2013
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|a published: Print
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|a Citation Status MEDLINE
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|a Functionalization of carbon nanotubes (CNTs) is important for enhancing deposition of metal nanoparticles in the fabrication of supported catalysts. A facile approach for oxidizing CNTs is presented using a sonochemical method to promote the density of surface functional groups. This was successfully employed in a previous study [J. Phys. Chem. B 2004, 108, 19255] to prepare highly dispersed, high-loading Pt nanoparticles on CNTs as fuel cell catalysts. X-ray photoelectron spectroscopy (XPS), transmission electron microscopy, cyclic voltammetry, and settling speeds were used to characterize the degree of surface functionalization and coverage. The sonochemical method effectively functionalized the CNTs. A mixture of -C-O-/-C=O and -COO- was observed along with evidence for weakly bound CO at longer treatment times. The integrated XPS C 1s core level peak area ratios of the oxidized-to-graphitic C oxidation states, as well as the atom % oxygen from the O 1s level, showed an increase in peak intensity (attributed to -CO(x)()) with increased sonication times from 1 to 8 h; the increase in C surface oxidation correlated well with the measured atom %. Most of the CNT surface oxidation occurred between 1 and 2 h. The sonochemically treated CNTs were also studied by cyclic voltammetry and settling experiments, and the results were consistent with the XPS observations
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|a Journal Article
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|a Research Support, Non-U.S. Gov't
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|a Nanotubes, Carbon
|2 NLM
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|a Platinum
|2 NLM
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|a Oxygen
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1 |
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|a Li, Liang
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|a Chusuei, Charles C
|e verfasserin
|4 aut
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|a Hull, Robert V
|e verfasserin
|4 aut
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| 773 |
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|i Enthalten in
|t Langmuir : the ACS journal of surfaces and colloids
|d 1991
|g 21(2005), 9 vom: 26. Apr., Seite 4185-90
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|x 0743-7463
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|g volume:21
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