Abstract
We report effects of proton irradiation on thermal oxidation of single-walled carbon nanotubes (SWNTs). Following 400 keV proton irradiation to doses of 10 13–10 17 cm −2, thermal oxidation of SWNTs was conducted at temperatures 200–700 °C. The mass of SWNTs during oxidation was monitored with thermogravimetric analysis (TGA) and ion-beam-induced structural modifications in nanotubes were characterized with Raman spectroscopy. Proton irradiation leads to enhanced thermal stability of nanotubes, as indicated by increased values of the temperature ( T max) for maximum oxidation rate, e.g. T max ∼ 495 °C for pristine SWNTs and T max ∼ 525 °C for SWNTs irradiated to the dose of 1 × 10 15 cm −2. The activation energy for oxidation increases gradually from 1.13 ± 0.01 eV for pristine SWNTs, to ∼1.25 ± 0.02 eV for the largest dose of 5 × 10 16 cm −2. Based on the correlation between TGA and Raman data, we discuss possible mechanisms for the observed effects of proton irradiation on SWNT thermal oxidation.
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