Nam, Ki-Ho Im, Yong-O. Park, Hye Jin Lee, Haena Park, Junbeom Jeong, Sunho Kim, Seung Min You, Nam-Ho Choi, Jae-Hak Han, Haksoo Lee, Kun-Hong Ku, Bon-Cheol 2024-01-20T00:01:00Z 2024-01-20T00:01:00Z 2021-09-03 2017-12-01 0266-3538 https://pubs.kist.re.kr/handle/201004/121938 Direct spinning of carbon nanotube (CNT) fibers is a facile method to produce CNT fibers because of its high productivity and the simplicity of the spinning process from CNT aerogels. Directly spun CNT fibers, however, generally include amorphous carbon and weak shear interaction between tubes or bundles, thereby causing insufficient load transfer. Here, we report newly designed polyimide/reduced graphene oxide (PI/RGO)/CNT fiber composites in combination with polymer infiltration followed by photonic flash sintering on a time scale of 0.5 ms to overcome the critical drawbacks in directly spun CNT fibers. The mechanical performances of the CNT fibers were closely related to the junction strength in CNT bundles. In addition, PI can be interlocked with CNT bundles and effectively serve as a binder to link the GO and CNT fibers with strong interfacial interactions. The PI infiltrated CNT fibers showed the highest load transfer, resulting in a significantly enhanced increase of 83% in specific strength (1.1 N/tex) and a 477% increase in tensile strength (800 MPa) compared to pristine CNT fibers. Furthermore, the photonic sintered PI/RGO/CNT fibers improved electrical conductivity by over 244% (5.5 x 10(3) S cm(-1)) over pristine CNT fibers without deteriorating mechanical properties. The results demonstrate that the mechanical strength, modulus and electrical conductivity can be enhanced simultaneously by molecular-level coupling of polymer/graphene with CNT fibers via photonic flash sintering. (C) 2017 Elsevier Ltd. All rights reserved. English ELSEVIER SCI LTD MACROSCOPIC FIBERS RAMAN-SPECTROSCOPY GRAPHENE OXIDE CONDUCTIVITY YARNS ENHANCEMENT STRENGTH TEXTILES RIBBONS BUNDLES Photoacoustic effect on the electrical and mechanical properties of polymer-infiltrated carbon nanotube fiber/graphene oxide composites Article 10.1016/j.compscitech.2017.10.014 1 COMPOSITES SCIENCE AND TECHNOLOGY, v.153, pp.136 - 144 COMPOSITES SCIENCE AND TECHNOLOGY 153 136 144 scie scopus 000418986300015 2-s2.0-85032279025 Materials Science, Composites Materials Science Article MACROSCOPIC FIBERS RAMAN-SPECTROSCOPY GRAPHENE OXIDE CONDUCTIVITY YARNS ENHANCEMENT STRENGTH TEXTILES RIBBONS BUNDLES Carbon nanotube fiber Photonic flash sintering Polyimide Reduced graphene oxide Electrical conductivity Mechanical strength