Radiation-induced mechanical property changes of CNT yarn
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2017 Elsevier B.V. Stimulated by the previous findings that ion beam can induce carbon nanotube (CNT) welding, we studied the irradiation effects on CNT yarns by proton irradiation. A 2.5 MeV proton beam was transmitted through a 25 m thick Ti window and irradiated CNT yarn in air. The yarn, of about 40 m in diameter, was fabricated by pulling and spinning CNT bundles from a CNT aligned film. After irradiation to an ion fluence of 5 1012, 1 1013, 1 1014, and 1 1015 cm2, Raman spectroscopy was performed to study defect behavior by comparing intensity changes to the D and G bands at 1350 cm1 and 1560 cm1, respectively. The analysis revealed a decreasing defect level up to 1 1013 cm2, followed by an increasing defect level with increasing fluence. The mechanical properties of the yarns are characterized by using a tensile tester with a strain rate of 0.2 mm/min at room temperature. The maximum tensile strength occurred at a fluence of 1 1013 cm2. With increasing proton fluencies, the fracture strain shows gradual enhancement.