Effect of Ozone Oxidation on Single-Walled Carbon Nanotubes
| Autor: | O. M. Castellini, Matthew S. Marcus, Robert J. Hamers, Chang-Soo Lee, Mark A. Eriksson, J. M. Simmons, Beth M. Nichols, Sarah E. Baker |
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| Rok vydání: | 2006 |
| Předmět: |
Materials science
Ozone Chemical Phenomena Photochemistry Ultraviolet Rays Analytical chemistry Carbon nanotube Electron Spectrum Analysis Raman law.invention Condensed Matter::Materials Science symbols.namesake chemistry.chemical_compound Electrical resistance and conductance law Materials Chemistry Physical and Theoretical Chemistry Nanotubes Chemistry Physical Fermi level Silicon Dioxide Carbon Surfaces Coatings and Films Optical properties of carbon nanotubes chemistry Chemical engineering symbols Spectrophotometry Ultraviolet Raman spectroscopy Oxidation-Reduction Ultraviolet photoelectron spectroscopy |
| Zdroj: | The Journal of Physical Chemistry B. 110:7113-7118 |
| ISSN: | 1520-5207 1520-6106 |
| DOI: | 10.1021/jp0548422 |
| Popis: | Exposing single-walled carbon nanotubes to room-temperature UV-generated ozone leads to an irreversible increase in their electrical resistance. We demonstrate that the increased resistance is due to ozone oxidation on the sidewalls of the nanotubes rather than at the end caps. Raman and X-ray photoelectron spectroscopies show an increase in the defect density due to the oxidation of the nanotubes. Using ultraviolet photoelectron spectroscopy, we show that these defects represent the removal of pi-conjugated electron states near the Fermi level, leading to the observed increase in electrical resistance. Oxidation of carbon nanotubes is an important first step in many chemical functionalization processes. Because the oxidation rate can be controlled with short exposures, UV-generated ozone offers the potential for use as a low-thermal-budget processing tool. |
| Databáze: | OpenAIRE |
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