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Increased Electrical Conductivity of Carbon Nanotube Fibers by Thermal and Voltage Annealing
C: Journal of Carbon Research, Volume: 8, Issue: 1, Start page: 1
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We report the effect of annealing, both electrical and by applied voltage, on the electrical conductivity of fibers spun from carbon nanotubes (CNTs). Commercial CNT fibers were used as part of a larger goal to better understand the factors that go into making a better electrical conductor from CNT...
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We report the effect of annealing, both electrical and by applied voltage, on the electrical conductivity of fibers spun from carbon nanotubes (CNTs). Commercial CNT fibers were used as part of a larger goal to better understand the factors that go into making a better electrical conductor from CNT fibers. A study of thermal annealing in a vacuum up to 800 °C was performed on smaller fiber sections along with a separate analysis of voltage annealing up to 7 VDC; both exhibited a sweet spot in the process as determined by a combination of a two-point probe measurement with a nanoprobe, resonant Raman spectroscopy, and X-ray photoelectron spectroscopy (XPS). Scaled-up tests were then performed in order to translate these results into bulk samples inside a tube furnace, with similar results that indicate the potential for an optimized method of achieving a better conductor sample made from CNT fibers. The results also help to determine the surface effects that need to be overcome in order to achieve this.
carbon, carbon nanotube, electrical conductor, annealing, energy
Faculty of Science and Engineering
This work was supported by the Office of Naval Research (N00014-15-2717). V.S.G. funded thanks to Salts Healthcare Ltd. A.O.W. is funded through Sêr Cymru II Fellowship by the Welsh Government and the European Regional Development Fund (ERDF). A.O.W. acknowledges funding from Welsh Government Circular Economy Capital Fund FY 2020-21. The authors acknowledge access to the SEM and XPS provided by the Swansea University AIM Facility, funded in part by the EPSRC (EP/M028267/1) and (EP/N020863/1), the European Regional Development Fund through the Welsh Government (80708) and the Welsh Government’s Sêr Cymru program.