Irradiation studies on carbon nanotube-reinforced boron carbide
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abstract
Radiation response of carbon nanotube (CNT) reinforced boron carbide composite has been studied for its application as a structural component in nuclear engineering. The composite was bombarded by 140 keV He ions at room temperature to a fluence ranging from 1 10 14 to 1 10 17 cm -2. Two-dimensional Raman mapping shows inhomogeneous distribution of CNTs, and was used to select regions of interest for damage characterization. For CNTs, the intensities ratio of D-G bands (I D/I G) increased with fluence up to a certain value, and decreased at the fluence of 5 10 16 cm -2. This fluence also corresponds to a trend break in the plot of FWHM (full width at half maximum) of G band vs. I D/I G ratio, which indicates amorphization of CNTs. The study shows that Raman spectroscopy is a powerful tool to quantitatively characterize radiation damage in CNT-reinforced composites. 2011 Elsevier B.V. All rights reserved.