Next Article in Journal
Effective Photoluminescence Imaging of Bubbles in hBN-Encapsulated WSe2 Monolayer
Previous Article in Journal
Exposure of Smaller and Oxidized Graphene on Polyurethane Surface Improves its Antimicrobial Performance
Article

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)

1
Institut für Anorganische Chemie, Leibniz Universität Hannover, Callinstr. 7, 30167 Hannover, Germany
2
Hannover School for Nanotechnology, Laboratorium für Nano und Quantenengineering (LNQE), Leibniz Universität Hannover, Schneiderberg 39, 30167 Hannover, Germany
3
Faculty II, Hochschule Hannover, University of Applied Sciences and Arts, Ricklinger Stadtweg 120, 30459 Hannover, Germany
4
Institut für Festkörperphysik, Leibniz Universität Hannover, Appelstraße 2, 30167 Hannover, Germany
5
Institut für Physik, Technische Universität Chemnitz, Reichenhainer Str. 70, 09107 Chemnitz, Germany
*
Author to whom correspondence should be addressed.
Nanomaterials 2020, 10(2), 351; https://doi.org/10.3390/nano10020351
Received: 5 January 2020 / Revised: 10 February 2020 / Accepted: 13 February 2020 / Published: 18 February 2020
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. View Full-Text
Keywords: polyacrylonitrile; graphene nanoplatelets; stabilization; carbonization; shrinkage stress; creep stress; graphitization; electrical anisotropy polyacrylonitrile; graphene nanoplatelets; stabilization; carbonization; shrinkage stress; creep stress; graphitization; electrical anisotropy
Show Figures

Graphical abstract

MDPI and ACS Style

Bin Ali, A.; Renz, F.; Koch, J.; Tegenkamp, C.; Sindelar, R. 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). Nanomaterials 2020, 10, 351. https://doi.org/10.3390/nano10020351

AMA Style

Bin Ali A, Renz F, Koch J, Tegenkamp C, Sindelar R. 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). Nanomaterials. 2020; 10(2):351. https://doi.org/10.3390/nano10020351

Chicago/Turabian Style

Bin Ali, Annas; Renz, Franz; Koch, Julian; Tegenkamp, Christoph; Sindelar, Ralf. 2020. "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)" Nanomaterials 10, no. 2: 351. https://doi.org/10.3390/nano10020351

Find Other Styles
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Search more from Scilit
 
Search
Back to TopTop