Synthesis of carbon nanofibers with a polygonal cross section by the catalytic decomposition of C2H2 over bi-metal catalysts

Carbon nanofibers with a polygonal cross section were synthesized using catalytic chemical vapor deposition over Fe–Sn, Ni–Sn or Co–Sn catalysts. Their morphologies were characterized by scanning and transmission electron microscopy. Edges connecting of two walls can be clearly observed and some adjacent walls have a V-shape. The lengths of the sides of the polygonal cross sections range from 150 to 500 nm over Fe–Sn or Co–Sn nanoparticles, increasing to 700–900 nm over Ni–Sn nanoparticles. Polygonal catalyst particles can be seen at the ends of the fibers.