期刊
CARBON
卷 179, 期 -, 页码 417-424出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2021.04.033
关键词
Carbon nanotube fibres; Floating catalyst chemical vapor deposition; Carbon conversion; Tensile properties; Electrical conductivity
资金
- European Union's Horizon 2020 research and innovation program under the Marie Sklodowska-Curie grant [797176]
- Madrid Regional Government [2017-T2/IND-5568, FOTOART-CM P2018/NMT-4367]
- European Union Horizon 2020 Program [678565, 738085, JTI-CS22016-CFP03-LPA-02-11]
- MINECO, Spain [RyC-2014-15115, HYNANOSC RTI2018-099504-A-C22]
- Marie Curie Actions (MSCA) [797176] Funding Source: Marie Curie Actions (MSCA)
This study conducted a parametric study of the CNT fibre spinning process and found that conducting the reaction at high temperature using toluene as a carbon source, and adjusting the promotor to carbon ratio can simultaneously improve conversion and properties.
Fibres of ultralong and aligned carbon nanotubes (CNT) have axial properties above reference engineering materials, proving to be exceptional materials for application in structural composites, energy storage and other devices. For CNT fibres produced by direct spinning from floating catalyst chemical vapor deposition (FCCVD), a scaled-up method, the challenge is to simultaneously achieve high process conversion and high-performance properties. This work presents a parametric study of the CNT fibre spinning process by establishing the relation between synthesis conditions, molecular composition (i.e. CNT type), fibre mechanical and electrical properties, and conversion. It demonstrates tensile properties (strength 2.1 +/- 0.13 N/tex, modulus 107 +/- 7 N/tex) above some carbon fibres, combined with carbon conversion about 5%, significantly above literature on similar materials. The combined improvement in conversion and properties is obtained by conducing the reaction at high temperature (1300 degrees C), using toluene as a carbon source, and through adjustment of the promotor to carbon ratio (S/C) to favor formation of few-layer, collapsed CNTs that maximize packing at relatively high conversions. Lower S/C ratios produce low-defect single-wall CNT, but weaker fibres. An increase in electrical conductivity to 3 x 10(5) S/m is also observed, with the data suggesting a correlation with longitudinal modulus. (C) 2021 Elsevier Ltd. All rights reserved.
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