Radiation-induced mechanical property changes of CNT yarn

[摘要] 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 mu m thick Ti window and irradiated CNT yarn in air. The yarn, of about 40 mu m in diameter, was fabricated by pulling and spinning CNT bundles from a CNT aligned film. After irradiation to an ion fluence of 5 x 10(12), 1 x 10(13), 1 x 10(14), and 1 x 10(15) cm(-2), Raman spectroscopy was performed to study defect behavior by comparing intensity changes to the D and G bands at 1350 cm(-1) and 1560 cm(-1), respectively. The analysis revealed a decreasing defect level up to 1 x 10(13) cm(-2), 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 x 10(13) cm(-2). With increasing proton fluencies, the fracture strain shows gradual enhancement. (C) 2017 Elsevier B.V. All rights reserved.

[发布日期] 2017-10-15

[效力级别]  Proceedings Paper

[关键词] Ion-solid interaction;Carbon nanotubes;Ion beam welding;Carbon nanotube yarn