Syntheses and Electronic Applications of Helical Carbon Nanofibers

High-Yield Synthesis of Helical Carbon Nanofibers Using Iron Oxide Fine Powder as a Catalyst

“…On the other hand, when the C2H2/N2 gas flow ratio was too high, excess C2H2 molecules were supplied to the catalyst nanoparticles, decreasing their catalytic activity. In this study, a C2H2/N2 flow rate ratio of 0.18 gave the highest CNC yield and the lowest compositional ratio of the carbon layer to the CNC layer in the deposit [15]. Thicknesses of CNC and carbon layers vs. C2H2/N2 gas flow ratio.…”

“…Figure 1 shows scanning electron microscopy (SEM) images of CNCs; CNC appears spring-like. The diameters of the coil fibers range from 100 to 200 nm, while the outer diameters of the coils range from 300 to 900 nm; the lengths of the coils are micrometer-scale [13][14][15]. The CNC fibers are composed of amorphous carbon and have structures similar to CMC.…”

“…The CNC fibers are composed of amorphous carbon and have structures similar to CMC. The CCVD method is one of the most powerful techniques for synthesis of CNT, CNF, and CNC, although carbon nanomaterials can be synthesized using various methods including arc discharge and laser vaporization [15]. For the growth of CNCs, a combination of two types of catalysts, one with higher carbon segregation ability and another with lower carbon segregation ability, is employed [10,13,16,17].…”