Low-temperature synthesis and characterization of helical carbon fibers by one-step chemical vapour deposition

Abstract

Helical carbon fibers (HCNFs) were synthesized by one-step chemical vapour deposition using cupric tartrate as a catalyst at temperature below 500°C. The bound rubber of natural rubber (NR)/HCNFs were also prepared in this study. The results of thermogravimetry–differential scanning calorimetry (TG/DSC) for cupric tartrate nanoparticles show that the transformation of C4H4CuO6→Cu reaction occurs at ∼250–310°C. The characterization of scanning electron microscopy (SEM), transmission electron microscope (TEM), X-ray diffraction (XRD) and Raman spectrum for the synthesized products confirms that the synthesis of HCNFs is highly temperature-dependent. The straight fibers with the fiber diameter of 100–400nm are obtained at 280°C and HCNFs can be synthesized at higher temperature, with the coil diameter of 0.5–1μm and fiber diameter of 100–200nm at 380°C, and the coil diameter of ∼100nm and fiber diameter of ∼80nm at 480°C. The maximum of the bound-rubber content (37%) can be obtained with the addition of 100wt.% HCNFs in NR, which indicates that the coiled configuration of HCNFs makes a noticeable contribution to the reinforcement of NR/CB system.