Volltext-Downloads (blau) und Frontdoor-Views (grau)
(Leider keine statistischen Daten vom 26.05. – 18.06.2018)
The search result changed since you submitted your search request. Documents might be displayed in a different sort order.
  • search hit 3 of 276
Back to Result List

Graphene Nanoplatelet (GNPs) Doped Carbon Nanofiber (CNF) System: Effect of GNPs on the Graphitic Structure of Creep Stress and Non-Creep Stress Stabilized Polyacrylonitrile (PAN)

  • Improving the graphitic structure in carbon nanofibers (CNFs) is important for exploiting their potential in mechanical, electrical and electrochemical applications. Typically, the synthesis of carbon fibers with a highly graphitized structure demands a high temperature of almost 2500 °C. Furthermore, to achieve an improved graphitic structure, the stabilization of a precursor fiber has to be assisted by the presence of tension in order to enhance the molecular orientation. Keeping this in view, herein we report on the fabrication of graphene nanoplatelets (GNPs) doped carbon nanofibers using electrospinning followed by oxidative stabilization and carbonization. The effect of doping GNPs on the graphitic structure was investigated by carbonizing them at various temperatures (1000 °C, 1200 °C, 1500 °C and 1700 °C). Additionally, a stabilization was achieved with and without constant creep stress (only shrinkage stress) for both pristine and doped precursor nanofibers, which were eventually carbonized at 1700 °C. Our findings reveal that the GNPs doping results in improving the graphitic structure of polyacrylonitrile (PAN). Further, in addition to the templating effect during the nucleation and growth of graphitic crystals, the GNPs encapsulated in the PAN nanofiber matrix act in-situ as micro clamp units performing the anchoring function by preventing the loss of molecular orientation during the stabilization stage, when no external tension is applied to nanofiber mats. The templating effect of the entire graphitization process is reflected by an increased electrical conductivity along the fibers. Simultaneously, the electrical anisotropy is reduced, i.e., the GNPs provide effective pathways with improved conductivity acting like bridges between the nanofibers resulting in an improved conductivity across the fiber direction compared to the pristine PAN system.

Download full text files

Export metadata

Additional Services

Share in Twitter Search Google Scholar

Statistics

frontdoor_oas
Metadaten
Author:Annas Bin Ali, Franz Renz, Julian Koch, Christoph Tegenkamp, Ralf SindelarGND
URN:urn:nbn:de:bsz:960-opus4-16234
DOI original:https://doi.org/10.3390/nano10020351
ISSN:2079-4991
Parent Title (English):Nanomaterials
Publisher:MDPI
Document Type:Article
Language:English
Year of Completion:2020
Release Date:2020/03/11
Tag:Schwindspannung
carbonization; creep stress; electrical anisotropy; graphene nanoplatelets; graphitization; polyacrylonitrile; shrinkage stress; stabilization
GND Keyword:Anisotropie; Graphen; Polyacrylnitril; Stabilisierung; Verkohlung
Volume:10
Issue:2
Link to catalogue:169238225X
DDC classes:660 Technische Chemie
Licence (German):License LogoCreative Commons - Namensnennung 4.0