期刊
CARBON
卷 172, 期 -, 页码 283-295出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2020.10.033
关键词
Aligned graphitic domains; Anisotropic conductivity; Creep stress assisted cyclization; Carbon nanofibers; Graphitization
资金
- Hannover School for Nanotechnology (HSN) [21-78904-63-7/16]
- Deutsche Forschungsgemeinschaft (DFG) [21-78904-63-7/16]
- DFG (Cluster of Excellence PhoenixD) [EXC 2122, 390833453, BI 1708/4-1]
- European Research Council (European Union's Horizon 2020 research and innovation program) [714429]
- European Research Council (ERC) [714429] Funding Source: European Research Council (ERC)
This study investigated the fabrication and characterization of PAN-based ECNF reinforced with MWCNTs, as well as the graphitic structure and electrical transport properties of four different ECNF systems. The addition of CNTs improved the graphitic structure of PAN, but the application of creep stress during cyclization resulted in reduced alignment of graphene planes and conductivity in the PAN/CNT system. The findings suggest that electrical transport in carbon nanofibers is a cumulative effect of hopping and band transport along chemically and structurally inhomogeneous ECNFs.
We report on the fabrication of Polyacrylonitrile (PAN) based electrospun carbon nanofiber (ECNF) reinforced with multi-walled carbon nanotubes (MWCNTs) and characterization of the graphitic structure as well as electrical transport properties for four different ECNF systems. The different systems were obtained by the combination of two different ways of cyclization for pristine PAN and PAN with CNTs addition (PAN/CNT), typically by the application of constant creep stress and a constraint fixing. The addition of CNTs improved the graphitic structure of PAN. For the detailed analysis of different systems, carbonization was performed at 1700 degrees C and the graphitic structures were characterized. The CNTs improve the alignment of graphitic domains even for non-creep cyclized systems. The application of creep stress during cyclization results in highly aligned graphene planes. However, the creep stress cyclized PAN/CNT system exhibited a reduction in the alignment of graphene planes coming along with the observation of discontinuous, randomly orientated domains and a reduced conductivity. The electrical anisotropy increased for creep cyclized PAN and PAN/CNT compared to non-creep stress cyclized system. Our findings reveal that electrical transport in carbon nanofibers need to be considered as a cumulative effect of hopping and band transport along chemically and structurally inhomogeneous ECNFs. (C) 2020 Elsevier Ltd. All rights reserved.
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