Structure–Property Relations in Carbon Nanotube Fibers by Downscaling Solution Processing |
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Authors: | Robert J Headrick Dmitri E Tsentalovich Julián Berdegué Elie Amram Bengio Lucy Liberman Olga Kleinerman Matthew S Lucas Yeshayahu Talmon Matteo Pasquali |
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Affiliation: | 1. Department of Chemistry, Department of Chemical and Biomolecular Engineering and Department of Materials Science and NanoEngineering, The Smalley Institute for Nanoscale Science and Technology, Rice University, Houston, TX, USA;2. Department of Chemical Engineering, Technion‐Israel Institute of Technology, Haifa, Israel;3. Universal Technology Corporation, Dayton, OH, USA;4. Air Force Research Laboratory, Wright‐Patterson AFB, OH, USA |
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Abstract: | At the microscopic scale, carbon nanotubes (CNTs) combine impressive tensile strength and electrical conductivity; however, their macroscopic counterparts have not met expectations. The reasons are variously attributed to inherent CNT sample properties (diameter and helicity polydispersity, high defect density, insufficient length) and manufacturing shortcomings (inadequate ordering and packing), which can lead to poor transmission of stress and current. To efficiently investigate the disparity between microscopic and macroscopic properties, a new method is introduced for processing microgram quantities of CNTs into highly oriented and well‐packed fibers. CNTs are dissolved into chlorosulfonic acid and processed into aligned films; each film can be peeled and twisted into multiple discrete fibers. Fibers fabricated by this method and solution‐spinning are directly compared to determine the impact of alignment, twist, packing density, and length. Surprisingly, these discrete fibers can be twice as strong as their solution‐spun counterparts despite a lower degree of alignment. Strength appears to be more sensitive to internal twist and packing density, while fiber conductivity is essentially equivalent among the two sets of samples. Importantly, this rapid fiber manufacturing method uses three orders of magnitude less material than solution spinning, expanding the experimental parameter space and enabling the exploration of unique CNT sources. |
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Keywords: | aligned film carbon nanotube CNT fiber |
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