Abstract: Carbon nanomaterials produced by catalytic CVD of halogenated hydrocarbons now attract much attention due to their particularly unique structure and properties [1]. Here we report on synthesis of carbon nanofibers (CNF) with segmented structure via decomposition of 1,2-dichloroethane (DCE) over Ni-M self-organizing catalysts (SOC). Series of microdisperse Ni-M alloys (M = Cr, Mo, Pt etc.) was synthesized by specially designed co-precipitation technique. Formation of corresponding Ni-M alloys was confirmed by XRD data. Ni-M alloys were tested as precursors for the SOC during the H2-assisted decomposition of DCE at 600°С. Interaction of Ni-M alloys with aggressive medium resulted in their rapid disintegration accompanied by emergence of disperse metallic particles functioning as active centres for CNF production. In all cases the introduction of metal M into Ni-alloy was shown to have positive stabilizing effect on catalytic activity and stability of nickel. The Mo metal in concentration of 8 wt.% was found to have the most significant impact upon catalytic performance of Ni (shortened induction period along with doubled yield of carbon product). The carbon filaments produced over Ni-M (M = Cr, Mo, Pt) catalysts are characterized with well-expressed segmental structure in which the fragments of densely and loosely packed graphenes are stacked with regular order (Fig.1). The formation mechanism for such structures implies the determining role of chlorine species interacting with metallic active particles. More characteristics of segmented CNF examined by Raman, BET and XPS will be provided in presentation. Also, the possible application of the segmented CNF as a component for the template synthesis of CNF/PE (PE – polyethylene) composites will be discussed in detail.

Cite: Mishakov I.V. , Bauman Y.I. , Wang C. , Korneev D.V. , Rudneva Y.V. , Plyusnin P.E. , Shubin Y.V. , Zdanovich A.A. , Matsko M.A. , Vedyagin A.A.
Segmented Carbon Nanofibers: Catalytic Synthesis, Formation Mechanism and Possible Applications
14th International Conference Advanced Carbon NanoStructures 01-05 Jul 2019