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Published on: April 2, 2015
Effect of UVB Light Exposure on Tensile Behavior of Carbon Nanotube Sheet
Abhendra K Singh1, Heath E Misak1, Shankar Mall1
1Department of Aeronautics and Astronautics, Air Force Institute of Technology, 2950 Hobson Way, Wright-Patterson AFB, OH 45433-7765, USA.
Abstract:
The effects of ultraviolet B (UVB) exposure on the tensile behavior of CNT sheet was investigated in this study. Two types of CNT sheet, one acid treated and one un-treated, were directly exposed to UVB light for 500 hours. The exposure was done using a UVB lamp inside a dark chamber under room temperature ambient condition. The microstructure of the CNT sheets were studied both prior to and after UVB exposure using a scanning electron microscope. Upon completion of the exposure duration, the CNT sheet test coupons were tested mechanically in tension using a microtester to evaluate the tensile strength and behavior. The results were compared to those of the CNT sheet test coupons that were not exposed to UVB light. It was observed that the strength of the acid treated CNT sheet decreased after UVB exposure while the strength of the un-treated CNT sheet increased. Apart from slight changes in stiffness, the overall mechanical behavior with increasing applied load did not show much change after the exposure to UVB light. The microscopic analysis showed evidences of morphological changes in the CNT microstructure upon UVB exposure. These changes supported the change in mechanical strength as a result of the UVB exposure.
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