TY  - JOUR
U1  - Zeitschriftenartikel, wissenschaftlich - begutachtet (reviewed)
A1  - Ali, Annas Bin
A1  - Renz, Franz
A1  - Koch, Julian
A1  - Tegenkamp, Christoph
A1  - Sindelar, Ralf
T1  - 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)
JF  - Nanomaterials
N2  - 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.
KW  - Polyacrylnitril
KW  - polyacrylonitrile
KW  - graphene nanoplatelets
KW  - stabilization
KW  - carbonization
KW  - shrinkage stress
KW  - creep stress
KW  - graphitization
KW  - electrical anisotropy
KW  - Graphen
KW  - Stabilisierung
KW  - Verkohlung
KW  - Anisotropie
KW  - Schwindspannung
Y1  - 2020
UN  - https://nbn-resolving.org/urn:nbn:de:bsz:960-opus4-16234
SN  - 2079-4991
SS  - 2079-4991
U6  - https://doi.org/10.25968/opus-1623
DO  - https://doi.org/10.25968/opus-1623
VL  - 10
IS  - 2
PB  - MDPI
ER  -