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Abstract: We report the effects of microwave irradiation on both unpurified and purified iron-catalyzed high-pressure disproportionation (HiPco)-grown single-walled carbon nanotubes (SWNTs) in ultrahigh vacuum. Under microwave irradiation, we observe that unpurified HiPco SWNTs quickly reach temperatures of approximately 1850 ºC. As a result, H2, H2O, CO, CO2, and CH4 gases are observed, and the Fe catalyst nanoparticles melt and coalesce into larger crystallites approximately four times their original diameter. In contrast, carbon black and purified HiPco SWNTs heat up to temperatures of 500-650 ºC. We propose that the significant heating of unpurified HiPco SWNTs is due to the Fe catalysts.
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Wadhawan, Atul; Garrett, David & Pérez, José M.Nanoparticle-assisted microwave absorption by single-wall carbon nanotubes,
article,
September 29, 2003;
[College Park, Maryland].
(https://digital.library.unt.edu/ark:/67531/metadc84153/:
accessed July 18, 2024),
University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu;
crediting UNT College of Arts and Sciences.