Enhancing the Strength, Toughness, and Electrical Conductivity of Twist-Spun Carbon Nanotube Yarns by π Bridging



The weak interfacial interactions between carbon nanotube (CNT) always results in low stress load transfer efficiency in CNT yarns, herein we fabricated strong, highly conducting CNT yarns at room temperature using molecules having aromatic end groups, π bridging neighboring CNTs. The resulting CNT yarns have high tensile strength with 1697 ± 24 MPa, toughness with 18.6 ± 1.6 MJ/m³, and electrical conductivity with 656.2 S/cm, which are 3.9, 2.5, and 3.5 times, respectively, as high as that of the neat CNT yarn. The specific tensile strength of the resulting CNT yarn is higher than that for previously reported CNT yarns fabricated at room temperature, even that for some CNT yarns fabricated using corossive environments or extreme temperature. This π bridging strategy provides a promising avenue for fabricating high performance CNT yarns under ambient conditions. ©2019 Elsevier Ltd


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Carbon nanotubes, Materials—Mechanical properties, Electric conductivity, Spinning, Wool, Electrical conductivity


Excellent Young Scientist Foundation of NSFC (51522301); the National Natural Science Foundation of China (21875010, 21273017, 51103004); the Program for New Century Excellent Talents in University (NCET-12-0034); the Fok Ying Tong Education Foundation (141045); the 111 Project (B14009); the Aeronautical Science Foundation of China (20145251035, 2015ZF21009); State Key Laboratory of Organic–Inorganic Composites, Beijing University of Chemical Technology (oic-201701007); the State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Donghua University (LK1710); the Fundamental Research Funds for the Central Universities (YWF-16-BJ-J-09, YWF-17-BJ-J-33, YWF-18-BJ-J-13); the Academic Excellence Foundation of BUAA (20170666); NSF Award 1636306.


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