Surface Modification of Electrospun Cellulose Nanofibers by Spontaneous Oxidative Polymerization of Dopamine to Produce High Yield Conductive Carbon Nanofibers
Paper ID : 1295-ICNS
Authors:
Hamdam Gaminian *1, Majid Montazer2
1Amirkabir University of Technology
2Amirkabir university of technology
Abstract:
Carbon nanofibers (CNFs) by desirable properties were successfully synthesized through carbonization of regenerated cellulose nanofibers functionalized via polydopamine (PDA) surface coating layer. Cellulose nanofibers were first fabricated by electrospinning of cellulose acetate solution followed by further deacetylation with NaOH solution. A self-assembled polydopamine layer is homogeneously deposited on the cellulose nanofiber surfaces by dipping the nanofiber mat into an alkaline dopamine solution and then subsequent oxidative polymerization of dopamine. Dopamine as a carbon source with high concentration of amine groups utilize to form carbon coating layer with high nitrogen content on the CNF surfaces after heat treatment. The overall process is simple, efficient, cost-effective and environmentally friendly as well as controllable. The obtained carbon nanofibers were characterized using scanning electron microscopy (SEM), Energy-dispersive X ray (EDX), X-ray diffraction (XRD), Raman spectroscopy and thermal gravimetric analysis. Dopamine as a flame retardant provides the thermal stabilization of cellulose nanofibers and finally their successful carbonization which significantly increases the carbon yield of final product from 12 to 20 %. Further, introducing nitrogen via formation of polydopamine on the cellulose nanofiber surfaces led to an increase in the electrical conductivity and higher hydrophilic properties.
Keywords:
Carbon nanofibers, Cellulose nanofibers, Conductivity, Dopamine, Electrospinning.
Status : Abstract Accepted (Oral Presentation)