Journal
SCIENCE ADVANCES
Volume 8, Issue 16, Pages -Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/sciadv.abn0939
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Funding
- KIST ORP Program [2E31332]
- Korean National Research Foundation [2019R1A5A8080326]
- European Union [678565]
- Air Force Office of Scientific Research of the United States [NANOYARN FA9550-18-1-7016]
- Carbon Hub, The Robert A. Welch Foundation [C-1668, C-1509]
- Department of Energy (DOE) of the United States [DE-AR0001015]
- Department of Energy (DOE) of the United States
- Basic Energy Science (BES) program [DE-FG02-06ER46308]
- Department of Defense through a National Defense Science and Engineering Graduate (NDSEG) Fellowship [32CFR 168a]
- National Research Foundation of Korea [2019R1A5A8080326] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Multidimensional nanostructures formed by coalescence of carbon nanotubes can create fibers with exceptional mechanical and electrical properties.
Theoretical considerations suggest that the strength of carbon nanotube (CNT) fibers be exceptional; however, their mechanical performance values are much lower than the theoretical values. To achieve macroscopic fibers with ultrahigh performance, we developed a method to form multidimensional nanostructures by coalescence of individual nanotubes. The highly aligned wet-spun fibers of single- or double-walled nanotube bundles were graphitized to induce nanotube collapse and multi-inner walled structures. These advanced nanostructures formed a network of interconnected, close-packed graphitic domains. Their near-perfect alignment and high longitudinal crystallinity that increased the shear strength between CNTs while retaining notable flexibility. The resulting fibers have an exceptional combination of high tensile strength (6.57 GPa), modulus (629 GPa), thermal conductivity (482 W/m.K), and electrical conductivity (2.2 MS/m), thereby overcoming the limits associated with conventional synthetic fibers.
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